~(32)P示踪大豆结实期叶面供磷的效应

大豆花荚期叶面示踪~(32)P,43～48％进入涂叶叶腋荚,余者上、下双向分配于涂叶相邻节位荚和叶片中。鼓粒期处理,荚中每百毫克干物质日均~(32)P分配百分数为花荚期平均值的5倍。在大豆产量形成时期,叶面施磷,平均增产10％。潜在产量的表达,取决于已经开始发育却由于某些原因未能继续充实的子粒,而不是子粒体积的扩大。

THE EFFECT OF SPRAYING PHOSPHATE ON SOYBEAN LEAF SURFACE IN THE FLOWERING AND PODDING PERIOD

When Sprayed on the leaf surface of soybean in the flowering and podding period, 43-48% of 32P used as tracer element got into the leaf axil pods of the sprayed leaf. The rest of the tracer was distributed up and down in the neighbouring pods and leaves. The average of 32P distribution in the pods a day per 100-mg dry matter, when the plant wastreated in kernel formation period, was 5 times that of flowering and podding period.On the average the yield increased by 10% when phosphate was applied to the leaves in soybean yield formation stage.The potential yield depended on the kernels which had already begun to develop but for some reason were unable to continue to fill rather than on the kernel expansion.