双季稻北缘早稻优化氮肥施用研究

Optimal nitrogen application for the north rimland of double-cropping rice

以常规品种早籼65和杂交组合香两优68为试验材料,在施氮量180 kg.hm-2的条件下,研究了不同氮肥运筹对水稻生长及产量的影响。结果表明,双季稻北缘地区早稻施用穗肥是必要的,穗肥比例以25%(20%-30%)为宜,基∶蘖∶穗为50∶25∶25是本地早稻推荐氮肥运筹方式。合理的氮肥运筹确保水稻群体生长发育平稳、协调,塑造适宜的群体结构和产量结构而增产。

Two early indica rice cultivars of Xiangliangyou 68 and Zaoxian 65 were used to study growth characters,yield and its components under the condition of the total applied nitrogen amount of 180 kg ·hm^-2 and different nitrogen fertilizer operations in the all growth stages. The results were as follows：it＇s necessary that dressing nitrogen fertilizer at panicle initiation stage for the north rimland of double-cropping early rice, the proper proportion of ear dressing was about 25% （ from 20% to 30% ）, recommend technology of nitrogen application correct balance between basal： tillering dressing： ear dressing was 50： 25： 25. The main benefit of this nitrogen application was related to its improved splitting and timing of fertilizer N applications leading to a more balanced supply of N nutrition for rice growth than the common fertilizer practice yield significantly.