土壤有效水与化肥相互作用机理及其应用研究——Ⅲ.不同土壤水势对甘蓝吸收水分和养分的影响

在4级水势下盆栽甘蓝159天,获得以下结果:甘蓝植株含水量与水势呈线性负相关;甘蓝日耗水量及干物质积累量分别与水势呈幂函数和指数负相关;甘蓝植株含N量与水势呈正相关而PK含量与水势呈负相关,因而其N/P和N/K随水势增高而升高,呈线性正相关。甘蓝对NPK养分的吸收量因水势增高而减少,呈幂函数负相关。

INTERACTION MECHANISM BETWEEN SOIL AVAILABLE WATER AND FERTILIZERS AND ITS APPLICATION Ⅲ. Affect of soil water-potential on water and nutrients uptaked by cabbage

Cabbage is cultivated in the pots for 159 days under 4 levels of soil water potential (SWP) treatments and the following results are obtained. The negative linear relationship is shown between water contents, in the cabbage plant and different SWP. The daily water comsuption, dry matter accumulation of cabbage and SWP shows negative power function and exponential function relationship, respectivelly. The N content of cabbage and SWP shows positive function relationship and the P, K content of cabbage and SW' shows negative function relationship. Therefore, the N/P and N/K ratio in cabbage plan are increased with increase of SWP and both ratios and SWP shows positive linear relationship. The NPK amounts uptaked by cabbage are increased while SWP levels are decreased which shows negative power function relationship. Theis paper gives all data discussed and statistical significance for the above mentioned every correlation