施氮模式对早稻农艺性状及氮肥利用率的影响

以陆两优996为供试材料,选择肥力中等的水稻田块,设置不施氮肥、农民习惯施肥(150kg/hm2,按N计,下同)、最佳养分(120kg/hm2)、超高产高效(150kg/hm2)、超高产(180kg/hm2)5种氮素水平,研究不同施氮模式对早稻农艺性状及氮素利用率的影响.结果表明,超高产高效处理能促进水稻根系生长,提高叶片叶绿素含量,有利于光合产物的形成和积累,有利于水稻对养分的吸收,与相同施氮水平的农民习惯施肥处理相比,其单产提高了5.61%,氮肥利用率提高了34.49%,表明超高产高效处理模式在稳产增产的前提下,能有效提高氮肥利用率,降低氮素损失,减少施肥带来的污染.

Effects of different nitrogen management models on agronomic characters and nitrogen fertilizer utilization efficiency of early rice

Using on Luliangyou996 as provided material, choosing middling fertility field for experiment, setting up 5 treatment levels, which are: fertilizer model without N, farmers-familiar fertilizer model(150 kg/hm2,according to N), the optimal-nutrient management model(120 kg/hm2), super-high-yield and high-efficient model(150 kg/hm2), super- high-yield model(180 kg/hm2), various forms of nitrogen nutrition on agronomic characters and nitrogen use efficiency on early rice were studied. The results showed that: super high yield and high efficient model could promote root growth, increase chlorophyll content of leaves, enhance the formation and accumulation of photosynthetic products, enhance the nutrient absorptivity of rice, compared to the farmers familiar fertilizer models which are treated at the same nitrogen fertilization level, its yield increased 5.61%, nitrogen use efficiency increased by 9.06 percentage points, relativly increased 34.49%. It showed that super high yield and high efficient model can improve the yield of rice,can be expected to effectively improve the nitrogen utilization, reduce nitrogen losses, decrease the pollution caused by fertilizer application.