1. Introduction
Whilst eradication of hunger and malnutrition is one of the major targets (Goal 02) of the United Nation’s Sustainable Development Goals [
1], it is now highly likely that many of the goals and targets related to food and nutrition security will not be reached by 2030. Unsustainable practices, broken land systems, loss of biodiversity and monocultures, are among the major points of vulnerability in the global food system that is currently relying only on 30 crops to fulfil 90% of the calorie needs [
2,
3,
4]. However, only three crops (wheat, maize, and rice) provide over 75% of the calorie requirements. At the global level, out of 300,000–500,000 higher plant species, about 30,000 are edible and approximately 7000 have been either cultivated or collected for human consumption [
4,
5]. Out of the 17 SDGs which focus on several critical global issues, the underutilised crops (UC) show the potential to contribute to SDG 1 (no poverty), 2 (zero hunger), 12 (responsible consumption and production), and 13 (climate action).
Apart from cases that can be made for a wider adoption of underutilised crops for land restoration, dietary, and economic diversification, many of these crops remain unknown to the public and wider agricultural stakeholders, and for this reason are not included in the local, regional, and global agricultural development programmes [
6,
7]. One of the major barriers to the inclusion of minor crops in the developmental programmes worldwide is dispersity and lack of knowledge about their suitability at different geographic scales and in relation to local needs [
8]. Despite the existence of global knowledge base for underutilised crops [
5], more effort is needed to evaluate and shortlist possible cropping options at national and regional scales based on specific needs and priorities.
Italy’s agriculture is affected by the impacts of climate change [
9,
10] such as loss of agrobiodiversity [
11], land degradation, and economic marginalization [
12]. One of the important implications of climate change for agriculture is the change in growing seasons and cropping systems. For example, the sowing date for annual crops might be affected as the result of changes in temperature regimes. Another implication of climate change is the change in the cropping system, particularly for rainfed agriculture, which has a direct impact on the productivity of such systems. In fact, declines are expected due to climate change for the yield of key crops such as wheat [
9], olive [
10], and grapevine [
13]. Changes in precipitation patterns are strongly linked to the loss of biodiversity and land degradation due to increases in extreme events (droughts and floods) [
14], which will in turn impact traditional high-input agriculture [
15,
16,
17]. As a result, land cover under agriculture in Italy has been reduced drastically over the last few decades. This poses a severe threat to the sustainability of the agricultural systems and food security [
9,
10].
Farm net revenues have been found to be sensitive to seasonal changes in temperature and precipitation, with strong consequences from severe changes in climate [
18]. This will lead to increases in economic inequality for vulnerable groups (women and other marginalised groups). Global warming will also unevenly affect Italian regions, particularly for regions that are less developed and more dependent on agricultural production [
19,
20]. This will in turn lead to more economic disparity in Italy, which will trigger a wider challenge to the environmental systems
As a result of climate change, heat stress, pest and disease activity, higher evaporative demand (which reduces water availability), and higher variability of rainfall will negatively affect future agriculture across Europe [
21]. Globally, existing food systems are unsustainable due to a few major issues, e.g., environmental impacts; risk to human health; intensive resource use; and the use of depleting non-renewable resources such as mineral fertilizer, pesticides, ground water, and certain energy sources [
22,
23,
24,
25]. Italy’s rich agrobiodiversity, particularly its herbaceous landraces, have been threatened due to a number of reasons [
11]. In this regard, innovative and regenerative approaches to agricultural development that take advantage of locally neglected and globally underutilised species can play a major role [
3]. Different underutilised species which are available in Italy are either cultivated, semi-domesticated, or in the wild [
26]. In such a context, agrobiodiversity can provide a solution to enhance the adaptation of the cropping systems to the future climate and, in turn, increase food production [
20].
Species that are resilient to agro-climatic changes; can withstand temperature extremes, drought, and flooding; can tolerate marginal soil conditions; are pest and disease tolerant compared to the current major crops; and are rich in nutrition content exist today and can be adopted for Italian agriculture. Collating knowledge about UCs is the first step towards addressing the gap in mainstreaming these crops. However, a major challenge remains: identification and shortlisting of crops using a multitude of criteria that are relevant to local adaptability of these crops. The traditional approaches to crop selection, however, are less evidence-based and more ad hoc. That is, crops are chosen based only on a few criteria, such as economic potential and general environmental conditions. This may restrict the adoption process for new crops by an industry that is risk averse [
3], warranting the need for development of comprehensive evidence bases that can reduce the initial implementation risks. Evaluating the suitability should start with climate and soil matching to understand the degree of adaptability of certain crops, followed by evaluation of (a) calorie and nutrition demand, (b) functions and uses, (c) availability and accessibility to their genomic material, (d) possession of adaptive traits, and (e) physiological traits.
In this paper, a multidisciplinary approach for developing an evidence base for crop shortlisting for Italy is discussed. This approach utilises a combination of crop–climate matching and a novel evidence base for shortlisting crops based on the rank summation index methodology. The output of this process is a list of high-potential crops that can be adopted for development across Italian territory. The article presents the results and outlines further actions to mainstream shortlisted crops.
4. Discussion
Food and nutrition security is a global challenge. Ending all forms of malnutrition by the end of the year 2030 is one of the targets of the United Nations sustainable development goals (SDG #2 Zero Hunger). Crop diversification, particularly using neglected and underutilised crops, is an ideal solution for eradicating malnutrition [
5,
36]. This is because the dependency on a few key crops/staple crops has been identified as a major barrier to dietary diversity and cause of malnutrition [
36]. In this regard, this article outlined a “systematic approach” that can be adopted for the identification of UCs across Italy. Using this approach, a list of high-potential UCs that can specifically be adapted for Italy are identified.
Figure 4 shows a downward trend for available agricultural lands. As land resources become scarce in Italy, efforts to develop high-potential crops are needed. In this regard, investment in the knowledge system [
7] such as the one that is discussed in this article will help with the following:
- 1-
Proposals for funding are backed by current evidence and data;
- 2-
Risk reduction by developing alternative plans;
- 3-
Answering ‘what if’ questions regarding the future of agriculture and environment.
Despite technical advancements, food and nutritional security and sustainability have not been achieved throughout the world in an equitable manner [
37]. Therefore, diversification of the farming system and food basket are ideal solutions to the problem [
38]. UCs have been identified as alternative crops for food and nutritional security and sustainability in many parts of the world [
5,
38,
39]. Therefore, a priority was given to nutrition security in crop selection. To make it sustainable, several features other than food sources were used to select the best UCs. This is because one of the prominent features of UCs is the adaptability to a wider range of biotic and abiotic stresses [
39,
40,
41,
42], which can make them become future crops [
43]. Crop species with adaptive traits are useful in breeding to improve agroecosystem resilience [
44] and, indirectly, farm revenue [
17].
Figure 5 shows the suggested reproducible ‘pipeline’ for developing evidence bases for agricultural diversification.
Since it does not need field experimental data or local knowledge, agro-ecological suitability analysis allows the assessment of wide range of crops over a large area [
45]. The site-specificity of field experiments hampers temporal and spatial analysis from a wide perspective [
46]. However, crop management (plant density, agrochemical application, irrigation) and production details cannot be recommended and assessed using the approach followed in this paper. The selection of suitable crops based on climate suitability and different types of favourable characteristics was the initial step in the selection of UCs. Once the potential crops are selected based on the suitability analysis, yield estimation (using crop modelling) and detailed field experiments are necessary before commercial cultivation.
One of the major drawbacks of selection of underutilised crops in different agro-ecological zones through the suitability assessment and yield prediction of underutilised crops is the lack of evaluation frameworks and models. However, with the growing concern in relation to neglected and underutilized crops, dedicated land evaluation frameworks and protocols [
8,
47,
48] and crop models/modelling approaches [
38,
39,
49,
50] which show potential have been carried out in the recent past. Other than the method used here for crop selection, different approaches/frameworks as mentioned above can be tested to select the most suitable crops. A separate article will describe the yield forecasting of one of the selected underutilised crops using a crop modelling approach.
Published information on some of the crops which were selected in this study are already available in Italy, which shows that there is potential. For example, quality trait and yield response, ecological benefit, agronomic, and other information on faba bean are reported in Italy [
51,
52,
53]. Even though the initial literature review in the Scopus database yielded a lower number of articles, there are several other articles that may have been indexed in other databases and available in other languages. Therefore, it is essential to perform a detailed literature review/systematic review to identify the available information on underutilised crops.
More attention should be paid to breeding, agronomic research, and value addition to popularise these crops in Italy. It is also important to study where in Italy would be most suitable for each high-potential underutilised crop, and their potential yields and economic returns. Lessons learned from other EU countries that show evidence of uneven distribution of agricultural development funds should be considered for Italy [
54,
55]. In particular, in terms of available funds, the impact of regional and continental investment on similar projects should be studied before making further cases for the development of new crops. Ample planning is required to ensure that the funds that are allocated for the development of the research value chain (RVCs) of UCs are utilised properly, and that a knowledge system approach [
37] is adopted for the development of UCs in Italy. In this regard, projects such as LandSupport [
56] can help with increasing confidence and awareness about alternative land uses.
5. Conclusions
An increasing number of studies show the vulnerability of food systems in Italy. This article presents a systematic approach to the selection of currently neglected and underutilised crops that could be the key to future sustainability of agriculture in Italy and elsewhere. A novel crop shortlisting framework based on (1) agro-ecological shortlisting and (2) rank summation index was performed across Italy in order to develop a priority list of crops that can help achieve food and nutritional security and sustainability. Out of the 2700 crops, 7 high-ranking crops from 4 categories were selected: teff (Eragrostis tef) from cereals and pseudocereals, faba bean (Vicia faba) and cowpea (Vigna unguiculata) from legumes, green arrow arum (Peltandra virginica) and Jerusalem artichoke (Helianthus tuberosus) from starchy roots/tubers, and fig-leaved gourd (Cucurbita ficifolia) and watercress (Nasturtium officinale) from vegetables. The crop selection approach used in this study can be used to diversify the food systems in Italy or elsewhere, using data collected from different sources.
The next step is to develop detailed climate and soil suitability assessments using local data, yield forecasting, and economic analysis. As more and more evidence and data appear in peer-reviewed literature on UCs, it is important to be able to automate the processes described in this article for the benefit of three groups of users: (1) researchers, (2) regulatory agencies, and (3) the public. Data can be mined automatically and used for automatic analysis along with other information from local, regional, and national data.
Advancement in environmental datasets such as for climate and soil will help improve the results reported this article. The evidence shows that the list of high-potential but neglected crops could be much larger; therefore, investment in knowledge systems and data infrastructures that can provide more options in terms of useful species for agriculture are required. It is also obligatory for all stakeholders in agriculture to promote new approaches in the development of alternative land uses, and therefore, with this article, the authors hope to trigger more discussion surrounding the inclusion of UCs in rural development plans using data-driven approaches.