Legume Genomics and Genetics 2025, Vol.16, No.6, 297-312 http://cropscipublisher.com/index.php/lgg 308 7.2 Variety screening and management practices during flood years in Dingxi, Gansu Dingxi, Gansu belongs to a semi-arid plateau area. In normal years, there is less precipitation, but rain and flood disasters may also occur under extreme climatic conditions. In 2018, Dingxi experienced an unusually rainy summer. The concentrated precipitation caused waterlogging and serious disease in some pea fields. That year, the local agricultural research department seized this "natural experiment" opportunity to screen and evaluate the performance of multiple pea varieties under rain and flood conditions. The results showed that some traditional high-yield varieties (such as Dingwan No. 3) had a pod setting rate of less than 50% in this rainy and flood-prone year, while the two introduced new moisture-resistant varieties still achieved a pod setting rate of more than 70%, and ultimately achieved a significant yield advantage (Figure 2) (Yang et al., 2022a). Figure 2 The characteristic of individual plant and population of pea variety ((a,b) for G1 and (c,d) for G10) in the field at E1 location in 2021. G1 = Semi-leafless pea variety Longwan 10; G10 = Check variety Zhongwan 6 (Adopted from Yang et al., 2022a) Based on this, the Dingxi Agricultural Station promptly adjusted the variety promotion catalog for the second year, giving priority to the supply of disease-resistant and moisture-resistant varieties to low-lying and flood-prone plots for planting, in order to improve the ability of these areas to resist abnormal weather. In terms of field management, Dingxi agricultural technicians advocate "special management in rainy and flooded years": when there is more rainfall, timely inter-cultivation and loosening of soil moisture should be carried out, and ditches should be dug to drain open water when necessary; during the pea pod filling period, appropriate topdressing of phosphorus and potassium fertilizers should be applied according to the growth of the plants to enhance the plant's resistance to stress; for seriously infected fields, they should be eradicated as soon as possible and replaced with other crops to avoid the spread of the disease. After the 2018 rain disaster, farmers reflected at the summary meeting that the plots with good drainage ditches and pea roots that were not soaked and rotten could still bloom
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