氮肥优化管理对稻花香抗倒伏能力的影响

优质水稻品种稻花香2号易倒伏,通过改善栽培措施提高其抗倒伏能力具有重要意义。设置习惯施肥、氮肥综合管理和控释掺混肥等处理,研究氮肥管理模式对稻花香2号抗倒伏能力影响。结果表明,与习惯施肥相比,氮肥综合管理处理增加茎秆含钾量,显著提高水稻茎秆抗折力,水稻田间倒伏较少或未倒伏,而习惯施肥处理倒伏比例为4.5%~8.7%(P0.05);氮肥综合管理和控释掺混肥处理比习惯施肥水稻产量提高7.0%和9.2%(P0.05);施用控释掺混肥处理水稻基部节间长度、基部第二节间充实度和茎秆抗折力等与氮肥综合管理处理无显著差异,但田间倒伏比例显著高于氮肥综合管理和习惯施肥,原因是施用控释肥掺混肥处理在整地时控释肥漂浮导致肥料分布不匀。氮肥综合管理可提高稻花香抗倒伏能力,提高水稻产量及稳产性。

Effect of optimal nitrogen management on rice lodging resistance ability of Daohuaxiang-2

It is very important to increase lodging resistance ability of rice through improving cultural program,since Daohuaxiang-2,quality variety of rice,is easy to be for lodging.The experiment with farmer fertilization practice (FFP),integrated nitrogen management (INM) and controlled release fertilizer (OPT) was conducted to study the effect of optimal nitrogen management on lodging resistance ability of rice in Daohuaxiang-2.The results showed that INM increased potassium contents of stem and breaking resistance of rice stem compared to FFP significantly.The field lodging rate of INM was rare or even not,while lodging rate of FFP was 4.5％-8.7％ (P＜0.05).Compared to FFP,INM and OPT increased grain yield by 7.0％ (P＜ 0.05) and 9.2％,respectively.For the reason of an uneven distributed of controlled release fertilizer after stir-slurry,field lodging rates in OPT were higher than those of INM and FFP,while the length of basal intemode,breaking resistance and plumpness of I2 had no significant difference.These results proved that INM could improve the lodging resistance ability,as well as a high yield and yield stability of Daohuaxiang-2.