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Article

Marketable Yield of Potato and Its Quantitative Parameters after Application of Herbicides and Biostimulants

by
Krystyna Zarzecka
1,*,
Marek Gugała
1,
Anna Sikorska
2,
Kornelia Grzywacz
1 and
Marek Niewęgłowski
1
1
Institute of Agriculture and Horticulture, Siedlce University of Natural Sciences and Humanities, Prusa 14, 08-110 Siedlce, Poland
2
Department of Agriculture, The State Higher School of Vocational Education in Ciechanów, Ciechanów, Narutowicza 9, 06-400 Ciechanów, Poland
*
Author to whom correspondence should be addressed.
Agriculture 2020, 10(2), 49; https://doi.org/10.3390/agriculture10020049
Submission received: 4 February 2020 / Revised: 19 February 2020 / Accepted: 20 February 2020 / Published: 22 February 2020
(This article belongs to the Section Crop Production)
Versions Notes

Abstract

:
Potato (Solanum tuberosum L.) is grown in over 160 countries. Weed competition and environmental stressors during the vegetative growth stage significantly impact crop yields. An experiment was conducted from 2012 to 2014 in Poland to assess the effect of herbicides linuron + clomazone (L+CH) and metribuzin (M) as well as herbicides mixed with biostimulants (linuron + clomazone and algae extract of Ecklonia maxima—auxins and gibberellins (L+CH+E) and metribuzin + sodium p-nitrophenolate, sodium o-nitrophenolate and sodium 5-nitroguaiacolate (M+S)) on weed infestation, marketable yield and yield components of the following three table potato cultivars: Bartek, Gawin and Honorata. In plots where potato had been treated with herbicides and herbicides mixed with biostimulants, a decline in the fresh matter of weeds was observed, ranging from 72.4% to 96.1%, which was followed by an increase in potato marketable yield (from 27.5% to 61%) and improved parameters of S. tuberosum yield components, compared with the control. Linear correlation coefficients indicated that the following characteristics: marketable yield, weight of tubers per plant and average weight per tuber were associated with weed infestation determined prior to potato harvest.

1. Introduction

Potato (Solanum tuberosum L.) is one of four major agricultural crops (after wheat, maize and rice) grown worldwide as a staple food for humans [1,2,3,4,5]. Potato is propagated vegetatively, which exposes the crop plant to numerous harmful factors (weeds, pests, viral, fungal and bacterial diseases). As a result of reduced soil tillage and simplified harvest, delayed planting dates, natural manuring and continuous cropping, an increase in weed infestation of fields planted to potato has been observed [6,7,8]. Potato is susceptible to weed infestation as it is grown in widely spaced rows, and its initial growth and development are slow. A decline in potato tuber yield due to segetal vegetation is estimated to range from 20% to 80% [9,10]. Plants growing in fields infested with weeds produce lower yields of, usually, poorer quality. Moreover, they require higher labour input and production costs [11,12,13]. Ilić et al. [11] showed that in experimental plots with herbicide application, potato yield was by 32% higher in relation to the yield from untreated experimental plots. As a result, there is an increased focus on establishment of effective weed control methods, which may include herbicides, herbicide mixtures, addition of adjuvants, and integration of mechanical and chemical practices [14]. Some researchers suggest that it is possible to improve the competitive ability of a crop plant and increase its yielding by applying biostimulants, either alone or mixed with herbicides [15,16,17,18,19]. Pavlista [15] and Van Oosten et al. [18] claimed that biostimulants stimulate plant growth processes by enhancing their resistance to stress, and promote plant growth and development thus improving plant yield quality and quantity. In potato, biostimulants promote tuber yield, improve tuber biological parameters, and increase potato resistance to unfavorable environmental conditions and pathogens [17]. According to Golian et al. [16], biostimulant application is particularly recommended under stress-inducing conditions such as during prolonged drought, shortage of nutrients in the soil and when applying plant protection agents. The working hypothesis assumed in the present study was that herbicides and biostimulants may contribute to an increase in potato tuber yield, and affect its components. Therefore, the research aimed to assess the impact of herbicides and their mixtures with biostimulants on fresh weight of weeds, marketable yield and components of potato yield (tuber weight per one potato plant, number of tubers, average weight of one potato tuber).

2. Materials and Methods

2.1. Location of the Field Experiment and Agronomic Management

The field experiment was conducted from 2012 to 2014 on a farm of the multi-branch company Soleks located in Wojnów, the District of Siedlce, Mazovian Voivodeship, Poland. It was established in a complete block design with a split-plot arrangement with three replications. The examined factors were:
I—Three cultivars of table potato: Bartek, Gawin and Honorata (Table 1). They are medium-early table potato cultivars producing high yields of very tasty and tasty regularly-shaped tubers which have light yellow flesh.
II—Five treatments of potato plants with herbicides and herbicides mixed with biostimulants:
1. Control object—without herbicides and biostimulants (CO),
2. Linuron + clomazone—Harrier 295 ZC (L+CH),
3. Linuron + clomazone—Harrier 295 ZC and Kelpak SL—extract from the algae Ecklonia maxima, auxins and gibberellins (L+CH+E),
4. Metribuzin—Sencor 70 WG (M),
5. Metribuzin—Sencor 70 WG, 70 WG, and Asahi SL—sodium p-nitrophenolate, sodium o-nitrophenolate, sodium 5-nitroguolacolate (M+S) (Table 2).
The mechanical practices were also performed in herbicide and biostimulant-treated units and the detailed description of the treatments and analysis of weed infestation were presented in an earlier work of Gugała et al. [8].
The herbicides and their rates were based on the recommendations for plant protection products for the years 2012–2013 issued by the Institute of Plant Protection—National Research Institute in Poznań, and weed species found in the experimental area [21]. The biostimulants Kelpak SL (auxins and gibberellins) and Asahi SL (sodium p-nitrophenolate, sodium o-nitrophenolate, sodium 5-nitroguaiacolate) were selected on the basis of a list of plant nutrients that can be traded on the Polish market, prepared by the Ministry of Agriculture and Rural Development of July 10, 2007 [22]. Rates of herbicides and biostimulants were used with 300 liters of water per hectare. Linuron + clomazone application was made 7–10 days following tuber planting, metribuzin was applied just before potato emergence, and auxins and gibberellins as well as sodium p-nitrophenolate and sodium o-nitrophenolate treatments were made twice—towards the end of emergence and at canopy closure. Each year, the experiment was conducted on soil belonging to Haplic Luvisol (LV-ha) with a texture of sandy loam according to the World Reference Base for Soil Resources (WRB FAO) [23]. The soil in the conducted experiment, was characterized by: 5.60–6.35 pH (in KCl), humus content—15.0–18.7 g kg−1, from high to very high content of available phosphorus (68.6–110 mg kg−1 P), medium to very high content of potassium (99.6–149.4 mg kg−1 K), high content of magnesium (50.0–56.0 mg kg−1 Mg) and low content of iron (465.0–570.5 mg kg−1 Fe soil dry matter).
In each year, the previous crop was winter wheat, and in autumn, manure was used at a rate of 25.0 t ha−1 and mineral fertilizers (phosphorus and potassium) at the following rates: 44.0 kg ha−1 P (in the form of 46% TSP triple superphosphate), 124.5 kg ha−1 K (in the form of 60% potassium chloride salt, white granulated). In the spring, nitrogen was used at a rate of 100 kg N per 1 ha (in the form of 34% ammonium salt). Potatoes were planted at a spacing of 67.5 × 37.0 cm in the second week of April and harvested at physiological maturity (phase BBCH 97), based on the scale of Biologische Bundesanstalt, Bundessortenamt und Chemische Industrie, in mid-September [24]. Each potato cultivar was planted in five rows 5.55 m long, with 0.675 m between-row spacing, the between-tuber spacing within the row being 0.37 m. The area of a single plot during planting was 18.75 m−2 (5 rows) and until harvest was 15 m−2 (4 rows). During the growing season, fungicides were used against the potato blight: Ridomil Gold MZ 68 WG (metalaxyl-M + mancozeb) and Altima 500 SC (fluazinam), Colorado potato beetle was controlled with the insecticides: Fastac 100 EC (alpha, cypermethrin) and Apacz 50 WG (clothianidin).

2.2. Weed Infestation Analysis, Tuber Yield and Its Components

Analysis of fresh weight of weeds in experimental plots just before tuber harvest was performed using the quantitative and weight method when plants entered the stage 97 based on the BBCH scale. The frame was tossed three times diagonally across the ridges and weeds within the frame were collected. Fresh matter weed control efficiency was expressed as percentages in relation to the control where weeds were managed by means of mechanical practices only [25]. The dominant weed species in the experiment were: Elymus repens, Echinochloa crus-galli, Chenopodium album, Stellaria media, Lycopsis arvensis, Viola arvensis. Each year prior to harvest, tubers of ten plants selected at random from each plot were dug to determine the following: tuber number per one plant and tuber weight, and the average weight of one tuber. Total tuber yield consisted of the weight of tubers harvested from the whole plot area and the weight of previously taken samples, both converted to t ha−1. Marketable yield included tubers with the diameter of over 35 mm without external and internal defects [26].

2.3. Statistical Analysis

The data were subjected to analysis of variance (ANOVA Cultivar × Methods × Years) in a factorial arrangement. The significance of the sources of variability was checked using the Fisher-Snedecor test, while the significance of differences between the averages was examined using the Tukey test at the significance level P ≤ 0.05. Calculations were performed in Excel using the authors’ own algorithm based on the split-plot mathematical model. The above statistical procedures are presented in the work by Trętowski and Wójcik [27]. The dependence between weed infestation and yield and yield components was determined, and linear correlation coefficients were calculated.

2.4. Weather Conditions

The humidity-thermal conditions in the study years varied. Air temperature in successive study years was, respectively, 1.0, 0.6 and 0.9 °C higher than the long-term mean. Additionally, in all the study years, the conditions in the months of tuber formation and yield accumulation (July and August) were favorable. Precipitation varied in individual growing seasons. In 2012, rainfall was by 33.0 mm lower than the long-term value but it was evenly distributed. In 2013, precipitation was the highest but unevenly distributed with shortage of rain in August. In 2014, precipitation shortage was recorded in July and it was followed by excessive rainfall in August.

3. Results and Discussion

Various solutions to create the most favorable conditions for crop plant growth and optimal yielding are sought in order to make full use of the biological potential of registered potato cultivars. Favorable conditions may be supported through implementation of successful weed control and application of biostimulants, which may enhance physiological processes counteracting stress conditions [16,28]. Weed fresh matter determined in the study was significantly affected by cultivar, herbicide and biostimulant application, and study year (Table 3).
The highest weed infestation was observed for cv. Gawin, and it was significantly lower for cv. Bartek and Honorata. The herbicide linuron + clomazone contributed to an eight-fold reduction in weed weight, and up to a 25-fold drop when the chemical was mixed with the biostimulant containing auxins and gibberellins compared with the control (Table 3).
A marked efficiency of weed control was observed following an application of linuron + clomazone (87.7%), linuron + clomazone and auxins and gibberellins (96.1%), as well as metribuzin (72.4%), whether it was applied alone on mixed with sodium p-nitrophenolate, sodium o-nitrophenolate and sodium 5-nitroguaiacolate (79.1%) (Table 4).
We obtained similar effects of weed control [8] when analyzing the dry weight of weeds. A similar efficiency of herbicides and their mixtures, reaching 96%, has been reported by other authors [3,14,29,30]. Matysiak et al. [30] found that an application of herbicides and herbicides with biostimulants at various rates (MCPA + dicamba, dicamba + triasulfuron, florasulam + 2,4-D) with biostimulants (Kelpak—auxins and gibberellins, Asahi—sodium p-nitrophenolate, sodium o-nitrophenolate, sodium 5-nitroguaiacolate) in wheat reduced the number of weedy species analyzed (Chenopodium album, Galium aparine, Matricaria indora, Veronica agrestis, Viola arvensis) by 55%–100% with regard to non-treated control. Research by Golian et al. [16] demonstrated that Asahi SL (sodium p-nitrophenolate, sodium o-nitrophenolate, sodium 5-nitroguaiacolate) mixed with metribuzin and applied to control weeds in carrot did not affect the efficacy of weed control but increased the yield of carrot roots compared with control. In the experiment reported here, there was a significant effect of cultivar, herbicide and biostimulant application as well as weather conditions in the study years on the marketable yield of potato tubers (Table 5 and Table 6).
The data indicated that cv. Honorata was the most productive in terms of yield compared with the remaining cultivars. The highest yields were harvested in plots sprayed with the herbicide metribuzin as well as metribuzin and sodium p-nitrophenolate, sodium o-nitrophenolate, sodium 5-nitroguaiacolate (treatments 4 and 5). Additionally, the biostimulant containing auxins and gibberellins mixed with linuron + clomazone had a positive effect, compared with the respective treatment without biostimulant, that is contributed to an increase in tuber yield, compared with the unit where weed control had been achieved by means of mechanical practices only. Linear correlation coefficients indicated that marketable yield was highly associated with weed infestation (Table 7).
A similar relationship has been reported by Gugała and Zarzecka [31] as well as Ilić et al. [11]. Pavlista [15] demonstrated an increase in potato tuber yield following an application of various rates of the growth regulator Auxigro (4-aminobutyric acid and L-glutamate) at different dates. Additionally, Mystkowska [32] observed an increase in the tuber yield of potato treated with Kelpak SL (auxins and gibberellins), Tytanit (titanium), Green OK (humic substances) and Brunatne Bio Złoto (auxins and cytokinins). Other authors [30,33] claimed that the biostimulants sodium p-nitrophenolate, sodium o-nitrophenolate, sodium 5-nitroguaiacolate and auxins and gibberellins contributed to an increase in yield as well as certain qualitative and quantitative characteristics of spring wheat, potato and winter oilseed rape. According to Wierzbowska et al. [17], the effect of growth regulators was influenced by weather conditions, and the applied biostimulants (Asahi SL—sodium p-nitrophenolate, sodium o-nitrophenolate, sodium 5-nitroguaiacolate; Bio-Algeen S90—extract from seawater brown algae; Kelpak SL—auxins and gibberellins) considerably increased tuber yield (by respectively 7.6%, 16.3% and 24.7%) only in the second year of experimentation when both the precipitation and temperature were lower during the growing season.
The weight of tubers per potato plant was influenced by product application treatments, as well as differences across study years (Table 5 and Table 8). The number of tubers produced by one plant was dependent upon cultivar and study years (Table 5 and Table 9), and the average weight of one tuber depended on the cultivar, herbicide and biostimulant application as well as study years (Table 5 and Table 10).
The highest tuber weight and average weight of one tuber were recorded for plots sprayed with metribuzin (treatment 4), being by 22% and 30% respectively higher than the control, and after metribuzin was mixed with sodium p-nitrophenolate, sodium o-nitrophenolate, sodium 5-nitroguaiacolate (treatment 5), being by 28% and 36% higher compared with the control. Additionally, a mixture of auxins and gibberellins and linuron + clomazone positively influenced the discussed characteristics. Linear correlation coefficients confirmed a significant association between tuber weight per one potato plant and average weight of one potato tuber, and fresh weight of weeds determined prior to potato tuber harvest (Table 7). Ilić et al. [11] showed that the number of tubers from one plant significantly depended on the number of weeds per unit area. Decrease of weed infestation led to significant increase in number of tubers per plant. This study also showed that the average number of tubers per plant achieved in experimental plots with herbicide treatment was by 40% higher compared with the number of tubers in non-treated experimental plots, the difference being highly significant. The unit efficiency of potato plants (weight and number of tubers per one plant and the average weight of one tuber) was also affected by cultivars, weather conditions in which the experiment was conducted and an interaction of herbicides and biostimulant application methods with study years. Ahmadi Lahijani et al. [19] demonstrated that growth regulators significantly affected tuber yield per plant and mean tuber weight compared with the control. Following an application of BAP (6-BenzylAminoPurine) +ABA (Abscisic Acid), yield per plant of cv. Agria increased by 20%, and the average weight of one tuber increased by 28% compared with the control. An application of only ABA increased yield per plant of cv. Fontane by 21%. Differences between cultivars in terms of total yield, marketable yield and tuber yield components as well as the effect of study years on the above-mentioned characteristics have been reported by other authors [32,34,35]. Mystkowska [32], who compared three cultivars, found that the highest yield was produced by Jelly (on average, 51.05 t∙ha−1) compared with Tajfun (42.6 t ha−1) and Honorata (40.9 t ha−1); also, the superlative yield was obtained in the year with the highest precipitation. Sanli et al. [34] demonstrated that tuber number per plant, marketable tuber yield and total tuber were significantly affected by the weather conditions in the years of experimentation. Merga and Dechassa [35] examined eight cultivars and found the highest marketable and total yields for cv. Bubu (39.4 t ha−1), and the lowest for cv. Jarso (20.89 t ha−1). In their study, the highest number of tubers per plant was produced by cv. Badasa. An interaction of the tested cultivars with herbicide and biostimulant application was confirmed. Wierzbowska et al. [17] demonstrated that, in the second study year (with lower precipitation and temperature during the growing season compared with the remaining years), Asahi SL (sodium p-nitrophenolate, sodium o-nitrophenolate, sodium 5-nitroguaiacolate), Bio-Algeen S90 (extract from seawater brown algae) and Kelpak SL (auxins and gibberellins) increased tuber yields of cv. Satina by 14.7%, 14.7% and 18.3% respectively; Bio-Algeen S90 (extract from seawater brown algae) and Kelpak SL (auxins and gibberellins) increased tuber yields of cv. Volumia by 16.2% and 24.7% respectively, and Kelpak SL (auxins and gibberellins) contributed to such a response in cv. Irga and Sylvana, the respective increases being 14.6% and 37.8%.

4. Conclusions

Herbicides and herbicide + biostimulant mixtures applied in potato cultivation contributed to an increase in marketable tuber yields, ranging from 27.5% to 61% compared with mechanical weed control, due to removal of competition with weeds and improved utilization of crop plant yield-formation potential. The biostimulants containing auxins and gibberellins as well as sodium p-nitrophenolate, sodium o-nitrophenolate and sodium 5-nitroguaiacolate mixed with herbicides insignificantly reduced weed weight and increased potato tuber yields by 10.7% and 8.5% (treatments 3,5), and increased the average weight of one tuber (treatment 3) compared with herbicide treatments. Correlation coefficients confirmed a strong association of marketable yield, tuber biomass per one plant and average weight of one tuber with weed infestation. Integration of mechanical and chemical practices as well as biostimulant application increases weed control efficiency and positively affects potato yield performance.

Author Contributions

Conceptualization, K.Z.; methodology, K.Z. and M.G.; software, M.G. and M.N.; writing—original draft preparation, K.Z.; resources, A.S.; writing—review and editing, K.Z., M.N. and K.G. All authors have read and agreed to the published version of the manuscript.

Funding

The results of the research within the research theme No. 31/20/B were financed from the science grant by the Ministry of Science and Higher Education in Poland.

Acknowledgments

We thank Honorata Dołęga-Ogrodnik for field and technical help.

Conflicts of Interest

The authors declare no conflict of interest.

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Table
Table 1. Potato cultivars and their most important features [20].
Table 1. Potato cultivars and their most important features [20].
Name CultivarsYear of RegistrationBreeding CenterTotal Yield (t ha−1)Taste
Scale 1–9		Utilisation
Bartek2003HZ Zamarte—Poland50.0–54.47.0
very good		frozen, salads, boiled
Gawin2010PMHZ Strzekęcin—Poland44.7–49.26.4
good		chips, boiled
Honorata2012BöhmNordkartoffelAgrarproduktion OHG—Deutschland44.1–52.06.7
good		chips, boiled
Table
Table 2. Description of herbicides and herbicide mixtures with biostimulants used in the experiment [21].
Table 2. Description of herbicides and herbicide mixtures with biostimulants used in the experiment [21].
Trade NameHerbicides (Active Ingredients)Rates ProductManufacturer
Control without herbicides and biostimulants—mechanical weeding prior to and after the emergence of potato plants
Harrier 295 ZClinuron + clomazone 2.0 dm3 ha−1Bayer Crop Science S.A.
Harrier 295 ZC and Kelpak SLlinuron + clomazone and extract from algae Ecklonia maxima—auxins and gibberellins2.0 dm3 ha−1 and 2.0 dm3 ha−1Bayer Crop Science S.A. and Kelp. Products Ltd.
Sencor 70 WGmetribuzin1.0 kg ha−1Bayer Crop Science S.A.
Sencor 70 WG and Asahi SLmetribuzin and sodium p-nitrophenolate, sodium o-nitrophenolate, sodium 5-nitroguolacolate1.0 kg ha−1 and 1.0 dm3 ha−1Bayer Crop Science S.A. and Arysta Life Science
Table
Table 3. Fresh weight of weeds in the field cultivated with potato before tuber harvest (g m−2).
Table 3. Fresh weight of weeds in the field cultivated with potato before tuber harvest (g m−2).
Treatments Cultivars Years Mean
BartekGawinHonorata201220132014
1. CO*
2. L+CH
3. L+CH+E
4. M
5. M+S		331.1A
15.6A
7.8A
72.3A
67.6A		383.3A
61.2A
23.8A
124.4A
88.0A		310.0A
48.9A
8.7A
85.6A
58.5A		257.8A
107.9B
24.7C
66.2C
25.1C		400.0A
17.8C
15.6C
133.3B
118.9B		366.7A
0
0
82.8B
70.0B		341.5a
41.9cd
13.4d
94.1b
71.3bc
Mean98.9b136.2a102.3b96.3b137.1a103.9b112.4
* 1. CO—Control; 2. L+CH—Harrier 295 ZC; 3. L+CH+E—Harrier 295 ZC + Kelpak SL; 4. M—Sencor 70 WG; 5. M+S—Sencor 70 WG + Asahi SL. Means followed by the same letters do not differ significantly at P ≤ 0.05. Means in columns marked with capital letters refer to interactions between the factors. Means in the last column and means in the last row (followed by lowercase) are for treatments, cultivars and years.
Table
Table 4. Weed reduction (fresh weight of weeds) in relation to control (%).
Table 4. Weed reduction (fresh weight of weeds) in relation to control (%).
TreatmentsCultivars Years Mean
BartekGawinHonorata201220132014
1. CO*
2. L+CH
3. L+CH+E
4. M
5. M+S		0
95.3
97.6
78.2
79.6		0
84.0
93.8
67.5
77.0		0
84.2
97.2
72.4
81.1		0
58.1
90.4
74.3
90.3		0
95.5
96.1
66.7
70.3		0
100.0
100.0
77.4
80.9		0
87.7
96.1
72.4
79.1
Mean87.780.683.778.382.289.6-
* 1. CO—Control; 2. L+CH—Harrier 295 ZC; 3. L+CH+E—Harrier 295 ZC + Kelpak SL; 4. M—Sencor 70 WG; 5. M+S—Sencor 70 WG + Asahi SL.
Table
Table 5. Analysis of variance for fresh weight of weeds and the marketable yield of potato tubers and components of potato yield.
Table 5. Analysis of variance for fresh weight of weeds and the marketable yield of potato tubers and components of potato yield.
Sources of VariationFresh Weight of Weeds (g m−2)Marketable Yield of Potato Tubers (t ha−1)Tuber Weight Per One Potato Plant (g)Tuber Number per one Potato Plant−1Average Weight of One Potato Tuber (g)
Cultivars (C)****ns****
Treatments (T)******ns**
Years (Y)**********
C × Tnsnsnsnsns
C × Y**nsnsnsns
T × Y**********
C × T × Ynsnsnsnsns
** Significant at P ≤ 0.05; ns, non-significant.
Table
Table 6. Marketable yield of potato tubers (t ha−1).
Table 6. Marketable yield of potato tubers (t ha−1).
Treatments Cultivars Years Mean
BartekGawinHonorata201220132014
1. CO*
2. L+CH
3. L+CH+E
4. M
5. M+S		23.57A
29.74A
33.89A
36.14A
38.91A		25.71A
31.57A
35.42A
35.77A
40.24A		28.06A
37.28A
39.87A
42.76A
45.28A		28.23E
35.91D
44.65BC
42.17C
48.03A		26.01C
33.93AB
33.58B
35.42A
37.89A		23.08C
28.76B
30.96B
37.08A
38.50A		25.77d
32.87c
36.40b
38.22b
41.47a
Mean32.45b33.74b38.65a39.80a33.37b31.68c34.95
* 1. CO—Control; 2. L+CH—Harrier 295 ZC; 3. L+CH+E—Harrier 295 ZC + Kelpak SL; 4. M—Sencor 70 WG; 5. M+S—Sencor 70 WG + Asahi SL. Means followed by the same letters do not differ significantly at P ≤ 0.05. Means in columns marked with capital letters refer to interactions between the factors. Means in the last column and means in the last row (followed by lowercase) are for treatments, cultivars and years.
Table
Table 7. Significant values of linear correlation coefficients between the fresh weight of weeds and the marketable yield of potato tubers and components of potato yield (means for cultivars and 3 study years).
Table 7. Significant values of linear correlation coefficients between the fresh weight of weeds and the marketable yield of potato tubers and components of potato yield (means for cultivars and 3 study years).
IndexMarketable Yield of Potato Tubers (t ha−1)Tuber Weight per one Potato Plant (g)Tuber Number per one Potato Plant−1Average Weight of one Potato Tuber (g)
Fresh weight of weeds (t ha−1)−0.769**- --
Fresh weight of weeds (g m−2)-−0.687**+0.098ns−0.633**
** Significant at P ≤ 0.05; ns, non-significant.
Table
Table 8. Tuber weight per one potato plant (g).
Table 8. Tuber weight per one potato plant (g).
Treatments Cultivars Years Mean
BartekGawinHonorata201220132014
1. CO*
2. L+CH
3. L+CH+E
4. M
5. M+S		831.3A
885.6A
964.0A
1001.9A
1036.3A		799.4A
855.5A
943.4A
972.7A
1005.7A		829.2A
930.9A
985.2A
1041.3A
1111.2A		922.2B
1012.2B
1175.6A
1152.2A
1237.8A		831.0A
875.4A
893.7A
900.6A
908.3A		706.7B
784.4B
823.3B
963.1A
1007.1A		820.0d
890.7cd
964.2bc
1005.3ab
1051.1a
Mean943.8a915.3a979.6a1100.0a881.8b856.9b946.2
* 1. CO—Control; 2. L+CH—Harrier 295 ZC; 3. L+CH+E—Harrier 295 ZC + Kelpak SL; 4. M—Sencor 70 WG; 5. M+S—Sencor 70 WG + Asahi SL. Means followed by the same letters do not differ significantly at P ≤ 0.05. Means in columns marked with capital letters refer to interactions between the factors. Means in the last column and means in the last row (followed by lowercase) are for treatments, cultivars and years.
Table
Table 9. Tuber number per one potato plant.
Table 9. Tuber number per one potato plant.
Treatments Cultivars Years Mean
BartekGawinHonorata201220132014
1. CO*
2. L+CH
3. L+CH+E
4. M
5. M+S 		9.5A
9.3A
9.5A
9.4A
9.3A		10.6A
10.2A
10.0A
9.9A
9.7A		9.7A
9.9A
9.8A
9.6A
9.5A		11.1B
11.9AB
12.7A
12.6A
12.8A		9.1A
8.5A
8.0A
7.9AB
7.5B		9.6A
9.1AB
8.6AB
8.4AB
8.2B		9.9a
9.8a
9.8a
9.6a
9.5a
Mean9.4b10.1a9.7ab12.2a8.2b8.8b9.7
* 1. CO—Control; 2. L+CH—Harrier 295 ZC; 3. L+CH+E—Harrier 295 ZC + Kelpak SL; 4. M—Sencor 70 WG; 5. M+S—Sencor 70 WG + Asahi SL. Means followed by the same letters do not differ significantly at P ≤ 0.05. Means in columns marked with capital letters refer to interactions between the factors. Means in the last row (followed by lowercase) are for cultivars and years.
Table
Table 10. Average weight of one potato tuber (g).
Table 10. Average weight of one potato tuber (g).
Treatments Cultivars Years Mean
BartekGawinHonorata201220132014
1. CO*
2. L+CH
3. L+CH+E
4. M
5. M+S		87.9A
95.4A
102.4A
109.5A
113.9A		77.3A
84.3A
93.6A
99.3A
104.9A		85.9A
97.3A
108.3A
117.4A
122.9A		81.7B
84.7A
94.4A
93.7A
95.8A		93.2C
104.1BC
113.1AB
115.6AB
122.9A		76.2C
88.1BC
96.9B
117.0A
123.1A		83.7d
92.3c
101.5b
108.8ab
113.9a
Mean101.8a91.9b106.4a90.0b109.8a100.3a100.0
* 1. CO—Control; 2. L+CH—Harrier 295 ZC; 3. L+CH+E—Harrier 295 ZC + Kelpak SL; 4. M—Sencor 70 WG; 5. M+S—Sencor 70 WG + Asahi SL. Means followed by the same letters do not differ significantly at P ≤ 0.05. Means in columns marked with capital letters refer to interactions between the factors. Means in the last column and means in the last row (followed by lowercase) are for treatments, cultivars and years.

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MDPI and ACS Style

Zarzecka, K.; Gugała, M.; Sikorska, A.; Grzywacz, K.; Niewęgłowski, M. Marketable Yield of Potato and Its Quantitative Parameters after Application of Herbicides and Biostimulants. Agriculture 2020, 10, 49. https://doi.org/10.3390/agriculture10020049

AMA Style

Zarzecka K, Gugała M, Sikorska A, Grzywacz K, Niewęgłowski M. Marketable Yield of Potato and Its Quantitative Parameters after Application of Herbicides and Biostimulants. Agriculture. 2020; 10(2):49. https://doi.org/10.3390/agriculture10020049

Chicago/Turabian Style

Zarzecka, Krystyna, Marek Gugała, Anna Sikorska, Kornelia Grzywacz, and Marek Niewęgłowski. 2020. "Marketable Yield of Potato and Its Quantitative Parameters after Application of Herbicides and Biostimulants" Agriculture 10, no. 2: 49. https://doi.org/10.3390/agriculture10020049

APA Style

Zarzecka, K., Gugała, M., Sikorska, A., Grzywacz, K., & Niewęgłowski, M. (2020). Marketable Yield of Potato and Its Quantitative Parameters after Application of Herbicides and Biostimulants. Agriculture, 10(2), 49. https://doi.org/10.3390/agriculture10020049

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