芋对氮磷钾吸收分配规律的研究

Absorption and distribution of nitrogen, phosphorus and potassium in taro

芋幼苗期对氮磷钾的吸收较少,发棵期和球茎膨大期吸收速率迅速增加,球茎膨大后期吸收积累速率又有所下降。总的来说,芋植株对钾的吸收最多,氮次之,磷最少,全生育期对氮磷钾的总吸收比例为1∶0.28∶1.1。幼苗期和发棵前期氮磷钾主要分布在叶片和叶柄中;其中,氮以叶片中居多,而磷和钾则以叶柄中居多。发棵后期和球茎膨大期主要分配在芋球茎中,其中氮磷的分配率为子芋大于孙芋,而钾则是孙芋中分配多于子芋。

The uptake of N, P, K by taro plant[\%Colocasia esculenta\% (L.) schott] was lower at seedling stage, but increased rapidly at leaf vigorous growth stage, and began to decrease at later corm vigorous growth stage. Totally, the uptake of K_2O was the highest, followed by N, and lowest was P_2O_5. In the whole life cycle, the ratio of N, P_2O_5, K_2O was 1∶0.28∶1.1. Nitrogen mainly distributed in leaves, then distributed to the first grade taro and second grade taro at the seedling stage. Phosphorus and potassium mainly distributed in petiole at seedling stage, then phosphorus mainly distributed to first grade taro, while potassium mainly distributed to second grade taro.