应用^(15)N研究滨海稻区高产施氮指标及氮素平衡

A Study on the Index of Nitrogenous Fertilizer Application and Nitrogen Balance for High Yield in Seashore Rice Region of Hebei by Using ^(15)N

应用^(15)N示踪,通过三年的盆栽、小区试验结果表明:滨海稻区中等肥力的土壤,每公顷施纯N150—165公斤,以底肥占1/2或1/3,蘖、穗肥各占1/4左右,施于0—10cm土层里.每公顷可收获9000公斤以上的稻谷.N素的利用率达33%,土壤残留率28%,损失率:39%.本研究不仅为水稻提供合理的施肥技术.同时也提供了科学施肥的依据.

The index of nitrogenous fertilizer application and nitrogen balance for high yield in seashore rice region of Hebei by using 15N were introduced in this paper. The results of pot-culture and field experiment for 3 years are as follows: 150-165kg of pure nitrogen per ha were applied in middle fertility soil, 1/2 or 1/3 of them were applied as base fertilizer, the other two 1/4 were applied at both tillering and booting stages. The fertilizer should be applied in 0-10cm deep. The yield per ha was over 9000kg. The utilization ratio of nitrogen was 33%, its residue ratio in soil - 28%, and the loss ratio-39%. This study provides not only the technology of rational application of nitrogen for rice, but also the basis for scientific application of nitrogenous fertilizer.