攀西地区水稻高产氮肥运筹模式的研究

Effects of Nitrogen Management on Grain Yield of Rice in Panxi Region

以攀西地区安宁河流域主推的杂交籼型优质稻金优527和常规粳型优质稻合系39为材料,采用田间试验方法,研究了氮肥运筹方式对水稻产量的影响,结果表明,氮肥用量对2供试品种产量的效应较穗粒肥比例的效应大,只有在适宜的氮肥水平和穗粒肥比例下才能获得水稻的高产;供试籼型品种对氮肥的敏感性较粳型品种高,其高产的适宜氮肥用量较粳型品种低。本文还分别建立了水稻产量与氮肥用量和穗粒肥比例的二次回归模型,并经统计分析得出了金优527产量≥10.5t/hm2、合系39产量≥10.5t/hm2的优化氮肥用量和穗粒肥比例。

With hybrid India variety Jingyou 527 and Japonica variety Hexi 39 which were extensively used in the area as the material, a field experiment was conducted to study the effect of nitrogen management on grain yield of rice in Panxi region in this paper. The results were： The effects of nitrogen rate on grain yield were more than that of ratio of ear-grain fertilizer. The grain yields were the highest only under the optimum nitrogen rate and optimum ratio of ear-grain fertilizer. However, the optimum nitrogen rate of Japonica variety for high yielding was larger than that of Indica variety, e.g. the sensitivity of Indica rice to nitrogen rate was greater than that of Japonica variety. The quadratic regression equations of grain yield to total nitrogen rate and ratio of ear-graln fertilizer were also established in this paper. The suitable nitrogen rate and ear-grain fertilizer for more than 10.5 t/hm^2 grain yield to Jingyou 527 and more than 9.0 t/hm^2 grain yield to Hexi 39 were calculated respectively.