辽宁省不同地区水稻减氮稳产肥密结构研究

为探讨辽宁省不同施肥水平地区水稻减氮稳产的可能性,设置不同肥密处理,研究了大田机插秧条件下肥密结构对不同地区主栽水稻品种产量的影响。试验结果表明,不同地区减少10%氮肥用量和常规氮肥用量处理间水稻产量没有显著差异,适当增加移栽密度是减氮稳产的有效途径之一。海城试验点盐丰47移栽密度以24万穴/hm ²较为合适,有效穗数达到400万穗/hm ²时,相对产量平均为104%。辽中试验点辽粳401移栽密度也以24万穴/hm ²较为合适,有效穗数约370万穗/hm ²时,相对产量平均为105%。庄河试验点辽粳401在常规施氮水平下33万和24万穴/hm ² 2个密度处理,以及减氮10%施氮水平下33万穴/hm ²密度处理产量较高,相对产量均达到110%以上。

Investigation on the Pattern of Fertilizer and Density for Rice Stable Yield under Low Nitrogen Rate Cultivation in Different Regions of Liaoning Province

Six treatments with three transplanting densities and two nitrogen application rates were set up to investigate the possibility of stablizing yield under the condition of nitrogen fertilizer reduction in different regions of Liaoning province. The results showed that there was no significant difference in rice yield between the reducing 10% nitrogen fertilizer treatment and the normal nitrogen fertilizer treatment in different regions, and proper increase of transplication density was one of the effective ways to reduce nitrogen and stabilize yield. The more suitable density for Yanfeng 47 in Haicheng and Liaojing 401 in Liaozhong was 2.4×10 ⁵ hole/ha. The number of effective panicles of Yanfeng 47 in Haicheng and Liaojing 401 in Liaozhong reached about 4.0×10 ⁶/ha and 3.7×10 ⁶/ha, respectively. While the yield of Liaojing 401 was high at the two densities of 3.3×10 ⁵ hole/ha and 2.4×10 ⁵ hole/ha under the normal nitrogen fertilizer treatment and the density of 3.3×10 ⁵ hole/ha under the reducing 10% nitrogen fertilizer treatment in Zhuanghe. The relative yield was more than 110% in these treatments.