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水稻对低磷介质的忍耐力强。一般作物在适当缺磷的条件下,根系发育较好,也能维持较强的吸磷能力;这可能是原因之一。特别是在磷的扩散速率为主要限制因素的缺磷土壤中,认为对水稻生育是有利的。但关于其促进生育的机制,还不清楚。为着明瞭植株体内磷含量比一般水平稍低情况下,根系发育的变化过程,作者把在完全培养液中生育的水稻移植到缺磷培养液中,观察其变化情况,结果如下: 1.从完全培养液移植到缺磷培养液后,根部干物重随即增加,达是由于主根数虽然稍有减少,但主根较长而粗。
Rice is endurable for low-phosphorus media. Under suitable conditions of phosphorus deficiency, the general crop developed better roots and also maintained strong phosphorus uptake capacity; this may be one of the reasons. Especially in phosphorus-deficient soils where the rate of phosphorus diffusion is the major limiting factor, it is considered beneficial for rice growth. However, it is not yet clear what mechanism to promote childbirth. In order to clarify the process of root development under the condition that the content of P in plant is slightly lower than the normal level, the author transplanted the rice which was born in the complete medium to the phosphate-deficient medium and observed its change. The results are as follows: 1. From After the complete culture medium was transplanted to the phosphorus-deficient culture medium, the dry matter weight of the root then increased, although the number of main roots was slightly reduced although the main roots were longer and thicker.