Calibration and validation of the AquaCrop model for repeatedly harvested leafy vegetables grown under different irrigation regimes

Nyathi, Melvin; Halsema, G.E. van; Annandale, J. G.; Struik, P.C.

doi:10.1016/j.agwat.2018.06.012

Cited by 32 publications

(21 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Water use efficiency Taro has potential for drought tolerance [63] Stomatal conductance is critical in regulating moisture stress in the Taro [64] 30% ETc can be recommended for Vigna unguiculata and Corchorus olitorius suggesting drought tolerance [65] AquaCrop models can be used for irrigation scheduling for sustainable ALV production [66] ALVs have superior nutritional water productivity when compared to exotic vegetables [67] Water use efficiency and Functional properties…”

Section: Production Component Conclusion Authormentioning

confidence: 99%

African Leafy Vegetables for Improved Human Nutrition and Food System Resilience in Southern Africa: A Scoping Review

et al. 2021

View full text Add to dashboard Cite

The economic potential of African leafy vegetables (ALVs) remains obscured by a poorly developed value chain. This scoping review assembled and examined scattered knowledge generated on ALVs across southern Africa, focusing on production, processing, marketing, and consumption. Two electronic databases (Scopus and Web of Science) were screened, and a total of 71 relevant studies were included and evaluated. The review provides a state of the art on knowledge related to utilisation of ALVs across the entire value chain. The findings show that functional properties are of prime importance in the production and consumption of ALVs. However, the lack of improved germplasm and a non-existent seed supply system are significant production bottlenecks. Pests and diseases affecting the productivity of ALVs remain mostly unexplored. Sun-drying and boiling were the most reported post-harvest processing methods, suggesting that traditional processing methods are still prominent. Many studies also confirmed the predominance of informal markets in the trading of ALVs as they fail to penetrate formal markets because of poor product positioning and exclusion from produce demand and supply forecasts. The inception of cultivar development, mechanised processing methods, and market linkages will enhance the profitability of ALVs in the region. This review enhances the gaining of insight into the state of different value chain components will assist in upscaling production, value addition of products, and enhance marketing efficiency. There is a great opportunity for basic and applied research into ALVs.

show abstract

Section: Production Component Conclusion Authormentioning

confidence: 99%

African Leafy Vegetables for Improved Human Nutrition and Food System Resilience in Southern Africa: A Scoping Review

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Based on AHP analysis, these crop species are, therefore, well adapted to high climate risk and can be produced under water-limited and extremely hot (33–38°C) conditions. Amaranth was highly suitable across most cropping lands in South Africa, and this is because the crop has a short growing period and low water requirement [ 65 ].…”

Section: Discussionmentioning

confidence: 99%

Multi-criteria suitability analysis for neglected and underutilised crop species in South Africa

et al. 2021

View full text Add to dashboard Cite

Several neglected and underutilised species (NUS) provide solutions to climate change and creating a Zero Hunger world, the Sustainable Development Goal 2. Several NUS are drought and heat stress-tolerant, making them ideal for improving marginalised cropping systems in drought-prone areas. However, owing to their status as NUS, current crop suitability maps do not include them as part of the crop choices. This study aimed to develop land suitability maps for selected NUS [sorghum, (Sorghum bicolor), cowpea (Vigna unguiculata), amaranth and taro (Colocasia esculenta)] using Analytic Hierarchy Process (AHP) in ArcGIS. Multidisciplinary factors from climatic, soil and landscape, socio-economic and technical indicators overlaid using Weighted Overlay Analysis. Validation was done through field visits, and area under the curve (AUC) was used to measure AHP model performance. The results indicated that sorghum was highly suitable (S1) = 2%, moderately suitable (S2) = 61%, marginally suitable (S3) = 33%, and unsuitable (N1) = 4%, cowpea S1 = 3%, S2 = 56%, S3 = 39%, N1 = 2%, amaranth S1 = 8%, S2 = 81%, S3 = 11%, and taro S1 = 0.4%, S2 = 28%, S3 = 64%, N1 = 7%, of calculated arable land of SA (12 655 859 ha). Overall, the validation showed that the mapping exercises exhibited a high degree of accuracies (i.e. sorghum AUC = 0.87, cowpea AUC = 0.88, amaranth AUC = 0.95 and taro AUC = 0.82). Rainfall was the most critical variable and criteria with the highest impact on land suitability of the NUS. Results of this study suggest that South Africa has a huge potential for NUS production. The maps developed can contribute to evidence-based and site-specific recommendations for NUS and their mainstreaming. Also, the maps can be used to design appropriate production guidelines and to support existing policy frameworks which advocate for sustainable intensification of marginalised cropping systems through increased crop diversity and the use of stress-tolerant food crops.

show abstract

“…This model suggests that the crop dependency is based on certain environmental scenario and the availability of water at the lowest part of the plant. The CC growth and ETo are affected as a result of the stress in water balance [12]. The soil water depletion threshold value is calibrated in order to control the effect of water stress on leaf development and ETo [13].…”

Section: Resultsmentioning

confidence: 99%

Examination of Sugarcane Yield by Simulating Aqua Crop to Overcome the Irrigation Deficiency

2019

IJRTE

View full text Add to dashboard Cite

Crop simulation models are significant apparatus used for measuring crop yield response to various conditions, also designed for conceiving systems to get better agricultural administration. Sugarcane is a major C4 crop grown in canal irrigated areas of the country. It has been observed that climatic distortions particularly precipitation and greatest temperature affect crop productivity and sugar recovery. AquaCrop is a typical model used here to develop the yield of sugarcane under different situations. The development of canopy cover is mainly affected by evapotranspiration and lacking of soil water balance. So the prime objective of this research is to study the stability of soil water in the root sector by delivering more cane yields with less water. By using AquaCrop, the crop water productivity can be maintained, canopy cover gets developed and finally the crops can be saved from destruction. It is an incorporated application programming to mimic the associations between plant, water and soil. So, field administration and water system administration should be considered for producing more water productivity. Four basic segments are required in this model namely climate, crop, field and irrigation management and soil profiles to expand the water efficiency.

show abstract

Calibration and validation of the AquaCrop model for repeatedly harvested leafy vegetables grown under different irrigation regimes

Cited by 32 publications

References 36 publications

African Leafy Vegetables for Improved Human Nutrition and Food System Resilience in Southern Africa: A Scoping Review

African Leafy Vegetables for Improved Human Nutrition and Food System Resilience in Southern Africa: A Scoping Review

Multi-criteria suitability analysis for neglected and underutilised crop species in South Africa

Examination of Sugarcane Yield by Simulating Aqua Crop to Overcome the Irrigation Deficiency

Contact Info

Product

Resources

About