小麦三叶期前幼苗生长与氮素营养

利用~(15)N 示踪田间模拟和砂培试验,着重研究了小麦幼苗(从种子萌发到三叶龄)生长与种子蛋白质含量的关系以及吸肥状况。结果表明:种子萌发后,根系即从土壤中吸收 N 素。三叶期幼苗植株中 N 素的60—80%来自肥料 N 和土壤 N。种子胚乳蛋白质只能满足一叶一心幼苗正常生长需要的 N 量。小麦胚乳营养中的 N素营养是影响幼苗生长的主要限制因素。从 N 素营养来看,幼苗离乳期是一叶一心期,不是三叶期。

STUDIES ON THE GROWTH OF WHEAT SEEDLINGS IN RELATION WITH NITROGEN NUTRITION

Using stable isotope~(15)N as tracer,by means of field simulation and sand culture,the relationship between the growth of wheat seedlings and the protein content of kernels was studied.ASo also was the abso- rption of nitrogen nutrition by the seedlings.The result indicated that the root systems began to absorb nitrogen from the soil as soon as the seedlings emerged.At three-leaf stage,60-80% of the nitrogen of the nitrogen of the seedlings came either from fertiligers or from the soil while protein from th...