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采用室内土柱模拟分析方法,研究了不同剂量的腐植酸对一定比例的混合沙土保水保肥能力的改良效果。试验结果显示:添加0、4、8、12 g的腐植酸,土柱淋溶液总渗透时间分别为1.6、9.4、16.0、35.0 h;淋溶液中有效磷总量分别为182.0、148.5、122.5、92.5μg;铵态氮总量分别为266、244、178、142μg。与对照相比,磷酸二铵溶液在添加腐植酸的土柱中渗透更慢,且渗透速率随腐植酸添加量的增加而减慢;淋溶液中的铵态氮与磷总量随腐植酸添加量的增加而显著减少。结果表明,腐植酸能显著提高混合沙土的保水与保肥能力。
Indoor soil column simulation analysis method was used to study the effects of different doses of humic acid on the water and fertilizer holding capacity of a certain proportion of mixed sand. The results showed that the total permeation time of humic acid at 0, 4, 8 and 12 g was 1.6, 9.4, 16.0 and 35.0 h, respectively. Total available phosphorus in leaching solution was 182.0, 148.5 and 122.5, 92.5μg; ammonium nitrogen total amount was 266,244,178,142μg. Compared with the control, the diammonium phosphate solution penetrated more slowly in the humic acid-added soil column, and the permeation rate slowed down with the increase of humic acid addition; the total amount of ammonium nitrogen and phosphorus in the leaching solution increased with humic acid The amount of increase significantly reduced. The results showed that humic acid can significantly improve the water retention and fertilizer holding capacity of mixed sand.