不同播种量对临麦4号产量和干物质积累及分配的影响

小麦播种量作为多项栽培措施中的重要一环,对于调整群体结构和产量水平有重要作用。以大穗型小麦品种临麦4号为研究材料,探讨75、150、225、300和375kg/hm² 5个播种量水平条件下的小麦群体结构、干物质积累与分配、产量的差异。2年结果表明,与其他播种量相比,150kg/hm²播种量处理花前营养器官干物质贮藏再转运量、花前营养器官干物质对籽粒的贡献率、花后干物质生产量、花后干物质对籽粒的贡献率和成熟期籽粒干物质积累量最高,均达显著差异水平;花后各器官干物质积累量在各播种量之间达显著差异水平,其中150kg/hm²播种量处理的穗部和整株的干物质积累量最高;150kg/hm²播种量处理籽粒产量最高,各播种量之间差异达显著水平。

Effects of Different Seeding Rates on Yield,Dry Matter Accumulation and Distribution of Linmai 4

As an important part of various cultivation measures, wheat seeding rate plays an important role in adjusting plant density and yield level. The difference in plant density, dry matter accumulation and distribution and yield of wheat under the five levels of seeding rates (75, 150, 225, 300 and 375kg/ha) were studied. The results of the two-year study showed that compared with other seeding rate, the dry matter storage and retransfer capacity of vegetative organs before flowering and its contribution rate to grains, the dry matter production after flowering and its contribution rate to grains, and the dry matter accumulation of grains at maturity were the highest at the seeding rate of 150kg/ha and reaching at a significant difference level. The dry matter accumulation of each organ after flowering was significantly different, among which the dry matter accumulations of spike and whole plant were the highest in the seeding rate of 150kg/ha. The grain yield was the highest at 150kg/ha seeding rate, and there were significant differences among different seeding rates.