地下滴灌时期和水量对紫花苜蓿种子生产的影响OA

Irrigation is an important management method to improve alfalfa(Medicago sativa)seed yield.In this study,we aimed to elucidate the impact of the timing and volume of drip irrigation on the yield components and actual yield of alfalfa seeds,and to investigate the mechanisms by which water influences seed yield formation.A field irrigation experiment was conducted from 2021 to 2022 using the alfalfa variety'Gannong No.4'.The experiment included two factors:irrigation timing(budding stage,full flowering stage,and a combination of budding stage+full flowering stage)and irrigation volume(225 and 450 m3·ha-1).Measurements of soil water content,seed yield components,and seed yield were obtained,and the correlations among these variables were analyzed.The findings indicated that:1)The timing of irrigation was the primary factor influencing seed yield,while the irrigation volume affected the number of seeds per pod.2)Significant positive correlations were detected between irrigation at the budding stage and the number of inflorescences per stem,and between irrigation at both the budding and full flowering stages and the overall seed yield.3)The seed yield was directly influenced by several factors,including the soil water content within the 20-40 cm soil layer,the soil water content at the harvest stage,the number of inflorescences per stem,the number of flowers per inflorescence,and the number of pods per inflorescence.These results indicate that the optimal underground drip irrigation strategy for the arid and semi-arid regions of central Ningxia involves applying water at 225 m3·ha-1 during the budding stage,225-450 m3·ha-1 during the full flowering stage,and 450 m3·ha-1 during the winter stage.