旱地高粱吸肥规律的研究

为提高旱地高粱产量,运用室内分析测试植株养分含量的方法,分不同生育阶段对其进行了吸肥规律的研究。结果表明：旱地高粱对氮、磷、钾素的吸收,在生长前期速度缓慢,吸肥量较少;生长中期速度加快并达高峰,吸肥量也最多,其中氮和钾的吸收高峰在拔节期至抽穗期,磷的吸收高峰在抽穗至灌浆期;生长后期吸肥速度逐渐减弱,吸肥量也明显减少。高粱全生育期吸肥量以钾最多,氮次之,磷最少。籽粒形成期对氮、磷、钾的吸肥比例为1∶2.61∶0.29。

Research on Fertilizer Absorption Rule of Dry Land Sorghum

In order to increase the yield of dry land sorghum,the fertilizer absorption rule was studied by determining the nutrient content in sorghum plants at different growth stages in laboratory.The results indicated that the absorption speed of sorghum to nitrogen,phosphorus and potassium was slower and the amount was less at the earlier growth stage;the speed was up to peak and the amount was the most at the middle growth stage,in which,the absorption peaks of N and K were from jointing stage to heading stage,w...