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