Details

Autor(en) / Beteiligte

• Zhao, Funian
• Zhang, Qiang
• Lei, Jun
• Zhang, Kai
• Wang, Heling
• Jiao, Runan
• Wu, Huiyan

Titel

Establishing a water-use boundary function for potato through crop modeling

Ist Teil von

• Field crops research, 2024-07, Vol.315, p.109445, Article 109445

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2024

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The yield to water-use boundary function is a valuable method for estimating attainable yield and yield gap (the difference between attainable yield and actual yield) in water-limited regions. However, the water-use boundary function for potato has not been clearly defined yet. In current research, we established a water-use boundary function for fresh potato tubers in a climatic transition zone (Longzhong Plateau, China) using a simple crop growth model. We validated this function using extensive long-term experimental data collected from field experiments and the literature. The results showed that the crop model accurately simulated the weight of fresh potato tubers with a relative root mean square error (RRMSE) of less than 30 %, a coefficient of determination (d) greater than 0.7, and a root mean square error (RMSE) of 5426 kg ha−1. The established water-use boundary function for fresh potato tubers is defined as: yield (kg ha−1) = 167 × (water use [mm] - 121), with a plateau yield of 48,082 kg ha−1 when water use exceeds 410 mm. Furthermore, the water-use boundary function was found to be highly applicable to water use-yield data collected from the literature and precipitation-yield data for the potato growing season from long-term observations. Utilizing precipitation data for the potato growing season from 1988 to 2018, the water-use boundary function was employed to calculate the average attainable yield for fresh potato tubers, ranging from 10,000 to 48,082 kg ha−1 in the Longzhong Plateau. The water-use boundary function for potato could aid farmers in water-limited regions in identifying the most profitable crop management systems. •The slope of the water-use boundary function for potato was 167 kg ha−1 mm−1.•The SSM-iCrop2 simulated potato fresh tubers with an RRMSE of less than 30 %.•The potato attainable yield in Longzhong Plateau ranged from 10000 to 49000 kg ha−1.