新疆干旱区灰漠土农田养分平衡与养分消长规律

长期定位试验结果表明 ,灰漠土的氮养分的自然供给力基本在 35 %以下 ,属于较低水平 ,因此氮肥的施入对作物的产量影响很明显。磷素自然供给力由 74.2 %下降到 5 0 % -60 % ;钾素自然供给力由 92 .2 %下降到 70 % - 80 %。农田养分平衡盈亏及其变化决定了土壤养分消长规律 ,其中有效磷的消长与磷素盈亏的相关模型为 Y=1 .72 7+ 0 .1 6X

Law of Nutrient Equilibrium,Gain and Loss in Grey Desert Soil Oases

Results of long-term permanent experiment indicated that the spontaneous nutrient supplying capacity of the typical grey desert soil oases varied in following way, its N supply capacity is below 35% in the plot without nitrogenous fertilizer, its phosphorous supply capacity decreased from 74.2%to 50%-60% in the plot of no phosphorus fertilizer, and its potassium supply capacity decreased from 92.2%to70%-80% in the plot of no phosphorus fertilizer. Nutrient equilibrium of the soil and its changes controlled nutrient gain or loss in the oasis .The correlation coefficient of the model between gain and loss of available phosphorus and of total phosphorus is Y=1.727 0.16X.