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为了解滴灌条件下不同微咸水矿化度及覆膜与否对盐碱地土壤水盐特性及油葵生长的影响,在宁夏平罗西大滩盐碱地进行不同灌水矿化度(0.2、1、2、3 g/L)膜下滴灌田间试验.结果表明,地膜覆盖比不覆盖处理土壤含水量高约2%,盐分表聚减缓,油葵株高、产量及其构成均高于不覆膜处理,产量最高增幅达82.5%;不同矿化度微咸水之间比较发现,利用矿化度为1 g/L的微咸水进行灌溉时,下层土壤含水量较高,微咸水滴灌不但没有为上层土壤带去过多盐分,反而由于土壤有一定的渗透性能,灌水将土壤上层盐分逐渐淋洗至下层.膜下滴灌微咸水矿化度为1 g/L时,油葵产量最大.因此在适宜条件、合理措施下,微咸水覆膜滴灌技术可以促进作物生长,确保作物产量,在淡水缺乏而微咸水较为丰富的盐碱地地区应积极推广利用.
In order to understand the effects of different brackish water salinities and mulch on soil water and salinity characteristics and oil sunflower growth under drip irrigation, different irrigation salinity (0.2,1,2 , 3 g / L) drip irrigation under field conditions.The results showed that the mulching with plastic film covered about 2% higher than the soil without mulch and the salinity table slowed down, the plant height, yield and composition of oil sunflower were higher than those without mulching , The highest increase rate of yield was 82.5%. The comparison between different salinities of brackish water showed that when using brackish water with the salinity of 1 g / L for irrigation, the lower soil moisture content was higher than brackish water drip irrigation However, due to the permeability of the soil, the salt in the upper layer of soil was rinsed to the lower layer by irrigation, and the yield of sunflower was the highest when the salinity of brackish water was 1 g / L. Therefore, under appropriate conditions and reasonable measures, the technology of drip irrigation with brackish water can promote crop growth and ensure the crop yield. It should be actively promoted and utilized in saline-alkali areas where the fresh water is scarce and brackish water is abundant.