【摘要】 在烟—稻轮作模式下,试验研究了氮肥不同施用量对晚稻产量构成因素的影响。试验结果表明:前作植烟可导致烟—稻轮作晚稻土壤有效养分含量高,因此晚稻产量与氮肥用量的相关性不是很强,氮肥施用过多,晚稻产量和氮肥效益反而下降。结果指出:耒阳市烟区晚稻栽培最佳经济施氮量以39.3 kg/hm2为宜,其对应最佳经济产量可达到7 639.5 kg/hm2。更多还原

【Abstract】 With tobacco-rice rotation cropping mode,the influences of different nitrogen fertilizer rates on yield components of late rice were studied.The results showed that for planting tobacco will result in high contents of available nutrients in tobacco-rice rotation cropping soil,the correlation between yield of late rice and nitrogen fertilizer rate is not significant,but over application of nitrogen will decrease yield of late rice and utilization rate of nitrogen fertilizer.Moreover,the results indicated that the optimal nitrogen fertilizer rate for cultivating late rice in tobacco planting area in Leiyang city was 39.3 kg/hm2,and the corresponding optimal economic yield can reach 7 639.5 kg/hm2.更多还原