改性腐植酸对土壤磷素的激活效应

长期施用磷肥导致土壤中固定态磷数量日渐增多,如何活化利用这部分磷日益成为节约磷肥资源、提高磷肥利用率的难题.通过加入高分子反应物与粗腐植酸进行共聚反应改变腐植酸原有的性质,在恒温恒湿条件下进行室内培养试验,研究不同的改性腐植酸对灰漠土固定态磷的激活效应.结果表明:腐植酸改性后激活土壤固定态磷的效果增强,激活作用一般能持续15 d左右,影响激活效果的主要是改性腐植酸的施用量、以及腐植酸改性时加入的高分子反应物量.表明改性腐植酸能够作为提高磷肥利用率的一种物质使用.

Active effects of Modified Humic Acids on Soil Fixed Phosphorus

The main purpose of the study was to increase availability utilization ratio of phosphorus and to activate the potential phosphorus in the soil.The fixed phosphorus in the soil was increased day after day because of long-term phosphorus application,The scientists designed the culture experiments in greenhouse under the constant temperature and found the original characters of humic acids changed.The active effects of different modified humic acids on gray desert soil were analyzed.Therefor experiment results indicated that the effect of soil fixed phosphorus was increased.The active effect could be preserved for about 15 d.The utilization amount of modified humic acids could affect ist active effect.The utilization amount of modified humic acids could affect its active effect.The results clemonstrated that modified humic acids could increase utilization ratio of phosphorus fertilizer.