改性木质素对砖红壤磷素有效性的影响

磷肥施入砖土壤后，土壤速效磷随着时间的推移，呈现下降的趋势。利用改性木质素缓释磷铵，可以有效地络合土壤活性钵，降低其活性，从而阻止土壤速效磷被固定，使土壤磷素维持在较高的水平。土壤中交换性钙和交换性镁对土壤速效磷的影响不大。

Effect of Modified Lignin on Phosphorus Availability of Latosol

After phosphate fertilizer being applied into the soil, the soil's rapidly available phosphorus shows the trend of decline with the tim e passing.Making use of modified lignin slow-release ammonium phosphate can eff ectively complex the activitive Fe in the soil and slow down its activity so as to both prevent the rapidly available phosphorus from being fixed and maintain t he soil's phosphorus elements at a higher level.The exchangeable calcium and mag nesium in the soil had little effect on the soil's rapidly available phosphorus.