滴灌施氮对赤红壤酸化的影响

通过盆栽试验研究滴施不同品种氮肥对赤红壤酸化过程的影响.结果表明,在滴施硫酸铵、硝酸铵和尿素的条件下,各个土层的pH值都有所降低,同时,土壤的交换性铝含量有一定程度的增加;种植玉米的处理在滴头正下方各个土层的pH值均高于不种植玉米的处理,而交换性铝含量则低于不种植玉米的处理.种植玉米能够缓解滴施氮肥后的土壤酸化,降低土壤交换性铝含量.

Effect of Nitrogen Fertigation on Acidification of Latosolic Red Soil

Different nitrogen fertilizers (ammonium sulfate, ammonium nitrate and urea) were applied to latosolic red soil in a pot experiment to investigate soil acidification processes under drip irrigation system. In the experiment 6 treatments were arranged with 4 replicates, and the soil acidification was compared between the treatment with maize planting and that without. The pH values of the soil at various layers were found to decrease and the exchangeable aluminum to increase after ammonium sulfate, ammonium nitrate and urea were fertigated. The pH values of different soil layers below drippers were higher but the content of exchangeable aluminum lower in the maize planting treatment than those in the non-maize planting treatment. This suggests that planting maize could reduce acidification and content of exchangeable aluminum of latosolic red soil resulted from nitrogen fertigation.