山西石灰性褐土的磷、锌关系及其对玉米幼苗生长的影响

为定量探讨石灰性土壤中的磷、锌关系及其对玉米幼苗生长的影响,运用数学模型,在土壤pH为8.12、有效磷为2.56ppm、有效锌为1.08ppm的山西石灰性褐土上进行盆栽试验。研究结果表明:(1)土壤磷、锌营养供应协调时,玉米幼苗对磷、锌的吸收具有显著的相互促进作用,否则,磷、锌相互拮抗。(2)施磷能促进土壤锌的解吸,增加土壤有效锌的含量。(3)土壤中的磷酸锌沉淀并不是引起作物缺磷或缺锌的主要原因,而可能是由于磷、锌营养平衡失调而引起的发生在根内的一种生理性障碍。

STUDIES ON INTERACTION BETWEEN P AND Zn AND THEIR INFLUENCE ON GROWTH OF CORN SEEDLINGS ON CALCAREOUS SOIL

Potexperiment was carried out for studying interaction between P and Zn of soil and their nutrition of corn seedlings,grown on Calcareous Cinnamon Soil of Shanxi,which was loamy in texture with a pH of 8.12,available P of 2.56 ppm and available Zn of 1.08 ppm.At the same time,mathematic modelling was used in order to quantitively study the interaction of P and Zn in Calcareous Soil and their mutual effects on corn growth.The main results obtained are summarized as follows:(1) When the supplies of available P and Zn in soil were harmony,the uptake of F and Zn by corn seedlings were accelerated each other and the interaction between P and Zn was significant and vice versa.(2) The P application could accelerat the desorption of zinc and increased the content of available soil Zn.(3) The precipitation of Zn₃(PO₁)₃ in soil wasn't the main cause of Zn and P deficiences.The mutual restraint of P and Zn in corn nutrition was a kind of physiological obstruction within roots.which was caused by imblance of nutrition.