不同土壤改良剂对滴灌模式下次生盐碱化土壤改良效果研究

为筛选出适合当地滴管模式下次生盐碱化土壤的土壤改良剂,在常年滴灌、次生盐碱化严重的地块,选用5种不同土壤改良剂进行大田试验,研究其对次生盐碱化土壤的改良效果。结果表明：施用土壤改良剂能在一定程度上改善次生盐碱化土壤结构,降低土壤盐分,提高土壤养分,对糯玉米株高的影响表现出循序渐进的趋势,对糯玉米叶绿素含量的影响表现出“前强、中弱、后平”的趋势,而且能够提高糯玉米的产量、产值、净增产及产量构成,但对土壤含水量、全氮含量、糯玉米茎周的影响不明显。不同土壤改良剂适宜性综合判定结果为：滴施型土壤改良剂在改善土壤理化性质和提高糯玉米产量方面较基施型土壤改良剂效果显著,滴施型聚马来酸类的盐碱土改良剂最适宜当地次生盐碱化土壤,其次为黄腐植酸类的盐碱土壤改良剂。

Effects of Different Soil Modifiers on Improving Secondary Salinization Soil Under Drip Irrigation

To screen out suitable soil modifiers for the secondary salinized soil under the dropper mode, 5 soil modifiers were selected for field test in perennial dripping irrigation and serious secondary salinized plot, to study their improvement effect. The results showed that the soil modifiers could improve the secondary salinized soil structure, reduce the soil salt content, and increase soil nutrients. The effect of soil modifiers on waxy corn plant height has a gradual improving trend. The effect of soil modifiers on the chlorophyll content of waxy corn presents a “strong, weak, flat” trend, and could improve the yield, output value, net yield increase and yield composition of waxy corn, but the effect on soil moisture content, total nitrogen content and waxy corn thick stems is not obvious. The comprehensive evaluation of the soil modifiers’ suitability shows that the dripping irrigation type of soil modifier is more effective than the basal application type of soil modifier in improving soil physical and chemical properties and increasing waxy corn yield, and the maleic acid dripping irrigation modifier is the most suitable for the local secondary salinized soil, followed by the fulvic acid soil modifier.