摘要
在不同P水平下用黄褐土盆栽玉米和大豆,生长6周进行植株和土壤钼的测定,结果表明:幼苗吸收土壤本底钼与P水平相关极显著,呈二次曲线关系。施P200ppm以上,P对幼苗吸收积累钼有明显抑制作用。P水平对钼在植株体内升降的影响因作物种类和部位而不同,大豆比玉米受影响较明显。施磷降低土壤有效钼的回收率,其下降幅度高磷>低磷,大豆>玉米,种植作物>休闲。
Eight P lavels from O to 350 ppm with a 50 ppm interval were employed in a Pot experiment for corn, and 6 P levels from 0 to 500ppm with 100 ppm interval for soybean. Results from 6—week seedlings show au apparent correlation between P-level and plant Mo content with Rs of 0.897' and 0.912' for overground Part and root of corn; 0.923' and 0.904' for those of soybean. P levels higher than 200—300 ppm obviously restrained the accumulation of Plant Mo. P—level influence varied with plant [kinds and parts. Influence on roots aPPeared to be stronger then on the overground Parts, and more Obvious on soybean than on corn.P level affected the correlation of Mo with other elements within Plants. Mo—N, Mo—Fe relationships revealed very significantly Possitive correlations for corn seedlings, and Mo—P, Mo—K, and Mo—Zn relations showed the opposite. Only Mo—Cu, and Mo—K were found Possitively correlated for soybean.The recovery of soil native Mo tends to decrease due to the application of P, suggesting that certain amount of soil available Mo may have turned to be unavailable. The reduced ranges for treatments are: +P>-P, high P>low P, soil with plant>without plant, and soil Mo aftergrowing soybean>soil Mo aftergrowing corn.
关键词
磷肥
玉米
大豆
幼苗
钼
营养
Phosphorus level
Corn
Soybean
Molybdenum content
Element correlation
Recovery of soil available Mo.
