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石膏与肥料配施对滨海盐土降盐抑碱的效果研究

DOI: 10.7685/j.issn.1000-2030.2014.04.015, PP. 103-108

Keywords: 石膏,肥料,盐分,总碱度,钠吸附比(SAR),降盐抑碱

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Abstract:

2009年在江苏省沿海地区农业科学研究所沿海农业科技示范园进行田间试验,作物种植方式为油菜玉米轮作。采取两因素三水平组合设计,3个石膏施用量和3种肥料(无机肥、生物有机肥、有机无机复混肥),以单独施用无机肥为对照,研究不同肥料与石膏配施下土壤盐碱指标的变化状况,综合评价各种施肥措施对滨海盐土降盐抑碱的效果,确定最优的施肥组合。结果表明石膏施用300kg?hm-2时,土壤盐分、总碱度、pH值和钠吸附比(SAR)较对照显著降低了57.40%、6.96%、0.44和35.72%,但过量(600kg?hm-2)施入石膏会导致盐分的升高;不同肥料处理后,土壤盐分、总碱度、pH值和SAR由大到小为有机无机复混肥、生物有机肥、无机肥处理;肥料与石膏交互作用明显,生物有机肥和有机无机复混肥与石膏配施后,土壤各盐碱指标较单一施用肥料或石膏显著降低,且有机无机复混肥与300kg?hm-2石膏配施对滨海盐土降盐抑碱的效果最好,土壤盐分、总碱度、pH值和SAR较对照分别降低了70.93%、38.26%、0.49和38.75%。土壤盐分与总碱度、pH值和SAR呈正相关关系,即随着盐分的降低,土壤碱化程度减弱,土壤降盐和抑碱同时发生。结论300kg?hm-2石膏与有机无机复混肥配施降盐抑碱效果最好,是适宜于滨海盐土的最优施肥组合。

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