稻田耕作方式和施氮水平对抛栽水稻群体质量及产量的影响

比较了4个施氮水平下免耕抛栽水稻和常耕抛栽水稻的群体质量及产量。结果表明,在127.5~193.0 kg/hm2施氮水平内,结实率随施氮水平的提高而降低,穗数、穗前干物质生产量、穗后干物质生产量、总干物质生产量、茎叶干物质表观输出量和表观输出率、植株高度、单茎重、粒叶比和根系活力随氮肥施用量的增加而增加,产量随施氮水平的提高而增加。1 9 3.0kg/hm2施氮处理的产量显著高于127.5 kg/hm2处理的。常耕抛栽水稻的有效穗数和粒叶比高于免耕抛栽水稻,但免耕水稻的干物质生产量、茎叶干物质表观输出量、茎叶干物质表观输出率、植株高度、单茎重、根系活力和颖花茎流量比常耕水稻的高,免耕抛栽水稻的群体质量略优于常耕抛栽水稻的。免耕抛栽水稻比常耕抛栽水稻增产2.10%,但差异不显著。

Effects of tillage patterns and nitrogen application levels on population quality and yield of cast transplanting rice

Nitrogen levels of 127.5,150.0,172.5 and 193.0 kg/hm~2 were designed in notillage(NT) cast transplanting rice and conventional tillage(CT) rice in this experiment to compare the population quality and yield.The results showed that as the nitrogen application increasing in both NT and CT,only seed set decreased,while the panicles,dry matter accumulation before and after heading,total dry mater accumulation,apparent transportation amounts and ratio of dry matter in stems and leaves,plant height,dry matter per stem,spike-leaf ratio,root activity and yield increased.The level of 193.0 kg/hm~2 nitrogen gained significant higher grain yield than that of 127.5 kg/hm~2 nitrogen.Comparing with NT,the CT obtained more panicles and greater spike-leaf ratios,but lower of total dry mater accumulation,apparent transportation amounts and ratios of dry matte in stems and leaves,plant height,dry matter per stem,root activity and bleeding potential in neck of panicle.Suggesting that population quality of cast transplanting rice under no-tillage is a little better than that under conventional tillage.Yield were not significant different between NT and CT.