水磷耦合对冬小麦幼苗营养元素含量的影响

本文研究了速效水范围内水磷耦合对冬小麦幼苗的N、P、K吸收量的影响。结果表明:不同速效水水平对小麦苗期N、P和K的吸收有明显影响。在不同的P水平处理时最高N、P吸收值都出现在速效水高的处理上,低水时N、P吸收也较低。中P与高水配合有利于N、P的吸收。低速效水时提高P水平可促进P吸收,但不能显著提高N吸收。速效水的水平对K吸收影响不如对P吸收影响明显,品种间差别不大。结果还显示土壤低P处理显著降低植株幼苗对P素的吸收,不同速效水水平时增加土壤P可以提高植株吸P量。土壤缺P对小麦植株K吸收有一定影响,水磷耦合后品种间的K吸收量差异加大。

COUPLING EFFECT OF WATER AND PHOSPHORUS ON NUTRITION OF WINTER WHEAT SEEDLING

Coupling effect of water (readily available water) and phosphorus on N, P, K uptake by winter wheat seedlings was studied. The results showed that availability of water had a notable effect on N, P, K uptake. The peaks of N and P uptake were always observed in treatments with a high level of readily available water regardless of P levels. When the level of readily available water went down, the uptake of N and P was also down. The coupling of moderate P rate with a high level of water was most contributive to P and N uptake. When the water level was low, increasing the input of phosphorus can improve absorption of P, but had no effect on absorption of N. The effect of readily available water on K uptake by the seedlings was not so obvious as that on P uptake. The experiment also showed in treatments low in P input seedling P uptake was significantly lower, and increasing P input can increase plant P uptake regardless of water levels. Soil P stress also had same effect on wheat K uptake. The coupling effect on K uptake varied sharply with the variety of the crop.