Effect of Sowing Date on Grain Filling Characteristics and Yield Composition of Black Rice
The objective of this study is to investigate the optimal sowing time for grain filling and yield formation in black rice,thereby providing both theoretical and practical foundations for its production. The effects of different sowing dates on the growth process,grain filling characteristics,and yield trait of black rice varieties'Heinuo','Lirenzi',and'Yanzinuo 35'were analyzed using five experimental sowing dates. The results indicated that the overall growth period of black rice varieties was reduced by an average of 12.7-30.3 days with delayed sowing dates. The Logistic equation model was applicable to grain filling dynamics of black rice (R2≥0.995,P<0.01). Grain filling characteristics and yield composition resulted from a combination of factors including sowing date,variety selection,and their interactions. Sowing dates ranged from March 1 to June 1,the grain weight and yield per plant significantly decreased by 1.32-2.15 g/1000grain and 9.12-16.08 g. From June 1 to July 1,the grain weight and yield per plant increased by 2.13 g/1000grain and 5.97 g. The results of the path analysis revealed that increasing grain filling duration was crucial for enhancing grain weight,while the decrease in both the number of filled grains per panicle and 1000-grain weight was the primary cause of yield reduction. Adjusting sowing dates earlier or later can prolong the filling duration and increase the number of filled grain per panicle,1000-grain weight,and seed setting rate. Sowing black rice in early March or late June is favorable for prolonging the grain filling period and enhancing both grain weight and yield.
black ricesowing datewhole growth periodlogistic equationgrain fillingyield traitpath analysis
万方数据
维普
