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由于设施生产中不合理施肥,设施土壤次生盐渍化的现象十分普遍。为了探讨设施菜田行之有效的土壤次生盐渍化改良措施,在夏季常规休闲期种植籽粒苋、苏丹草、甜高粱和甜玉米4种填闲作物,研究其改良土壤次生盐渍化的效果。结果表明:C4类的作物是理想的填闲作物,具有短期内生物量大,耐高温的特点;与对照相比,种植填闲作物后土壤速效养分含量和土壤各盐分离子大幅减少,土壤EC值降低;填闲作物翻压还田,能为下茬提供数量可观的养分来源。京郊日光温室菜田在常规休闲期种植甜玉米,结合揭膜淋伏雨的措施,可显著降低土壤养分的积累,延缓土壤次生盐渍化的形成。
Due to irrational fertilization in facility production, secondary salinization of facility soil is widespread. In order to explore the effective measures of secondary salinization of soils in vegetable fields, four kinds of paddy crops such as amaranth, sudangrass, sweet sorghum and sweet corn were planted in the normal summer leisure season to study the effects of secondary salinization Effect. The results showed that C4 crops were the ideal landfill crops with large biomass and high temperature resistance in short term. Compared with the control, the available nutrient contents of soil and the salt ions in soils were significantly reduced, and EC Reduce the value; filling crops back into pressure, can provide a considerable amount of nutrients for the next crop. The cultivation of sweet corn in the greenhouse in the suburbs sunlight greenhouse during the normal leisure period can significantly reduce the accumulation of soil nutrients and delay the formation of secondary salinization in soil, in combination with the measures of uncovering rain and pouring rain.