不同氮肥用量对元阳梯田水稻产量及构成因素的影响

 为研究元阳传统栽培品种和外来引入新品种对不同氮肥用量的响应，在不同的氮肥处理下，对元阳地区月亮谷（传统品种）和楚粳26号（新品种）的氮素吸收量、水稻稻瘟病病情指数及产量构成因素进行了分析研究。结果表明，随着氮肥投入量的增加造成月亮谷减产，并引发了稻瘟病，氮素的吸收、利用效率随氮肥投入量的增加而下降，处理2（7500kg/hm2有机肥）产量最高，分别比处理1（不施肥）、处理3（7500kg/hm2有机肥+75kg/ hm2氮肥）、处理4（7500kg/hm2有机肥+150kg/hm2氮肥）增产14%,10%,11%。而对于楚粳26号，氮素用量最高的处理4（7500kg/hm2有机肥+150kg/hm2氮肥）相比处理1（不施肥）、处理2（7500kg/hm2有机肥）、处理3（7500kg/hm2有机肥+75kg/ hm2氮肥）分别增产77%,46%,10%，氮素利用效率随氮肥投入量的增加呈上升状态。

Effects of Different Nitrogen Fertilizer Use Level on Yield Component and Grain Yield in Yuanyang Terrace

o study the effects of different nitrogen fertilizer use levels on local traditional and introduced rice varieties in Yuanyang terrace，the nitrogen uptake，diseased index and yield of Yuelianggu (traditional) and Chu 26 (introduced) were analyzed in the different nitrogen treatments. The experimental results showed that，with the increase of nitrogenous fertilizer inputs，the yield of Yuelianggu declined，rice blast happened，nitrogen uptake efficiency and nitrogen utilization efficiency went down. The yield of treatment 2(7500kg/hm2 organic fertilizer) had raised 14%，10% and 11%，respectively，compared with that of treatment 1(without fertilizer)，treatment 3(7500kg/hm2 organic fertilizer +75kg/ hm2  nitrogen fertilizer) and treatment 4(7500kg/hm2 organic fertilizer +150kg/ hm2  nitrogen fertilizer). Meanwhile，the Chu 26 had positive responds to the exogenous active nitrogen. The yield of treatment 4 (7500kg/hm2 organic fertilizer +150kg/ hm2  nitrogen fertilizer) had raised 77%，46% and 10%，respectively，compared with that of treatment 1(without fertilizer)，treatment 2(7500kg/hm2  organic fertilizer)，and treatment 3(7500kg/hm2 organic fertilizer +75kg/ hm2  nitrogen fertilizer). The nitrogen utilization efficiency became higher along with the nitrogenous fertilizer inputs increased.