白浆土磷锌关系的研究

通过磷锌不同用量的室内培养试验和温室盆栽试验研究表明，大量施用磷肥降低了土的有效性，尤其是在缺锌的土壤中，白浆土锌分级测定表明，土壤中锌主要以矿物态存在，施用锌肥增加了交换态锌和氧化锰结合态锌含量；但同时施用磷肥，无定形铁结合态锌和晶形铁结合态锌则有一定的增咖，降低了土壤锌的有效性。施用磷肥也增加了锌在植株根部的积累，降低了植株根部的积累，降低了植株各上部锌供应。磷锌交互作用不仅发生在土壤中，也存

INTERACTION OF PHOSPHORUS AND ZINC IN ALBIC SOIL

Thermostatic incubation and greenhouse experiments were carried out to study the effectS of appliedphosphorus fertilder on zinc availability in albic soil. There were increases of exchangeable Zn and MnO2 bound-Znwith the application of Zn fertilizer. But the amountS of amorphous Fe bound-Zn and crystalline Fe bound-Zn were increase when phosphorus and zinc fertilizers were applied together. The P application increased the zinc adsorptionand fixation on Fe and Al oxide, resulting in the decrease of Zn availability; meanwhile it also cave rise to the zinc accumulstion in the plsnt rootS and induce zinc deficiency. The P and Zn interaction occured both in the soil and in theplants.