Effect of intensive reduction treatment with irrigation water on continuous cropping in solar greenhouse
A solar greenhouse that had been continuously planting melons for many years was taken as the research object.The greenhouse soil was treated with no soil treatment(-RSD),corn stalk returning to the field+intensive reduction sterilization(RSD)and corn stalk returning to the field+no intensive reduction sterilization(CK),respectively,after the harvest of the previous crop.The basic indicators of the greenhouse soil before and after treatment(organic matter,total nitrogen,nitrate nitrogen,ammonium nitrogen,available phosphorus,available potassium,pH,and electrical conductivity),the number of root-knot nematodes,as well as the weight and sugar content of the subsequent melon crop were compared in the three treatments to investigate the effects of intensive reduction by irrigation on continuous cropping in solar greenhouse.The results showed that,compared with-RSD treatment,the content of soil organic matter in the(0,20]cm soil layer treated with RSD was slightly increased,while available phosphorus,available potassium,and EC values all showed varying degrees of decrease.The nitrate nitrogen content in the(0,40]cm soil layer significantly decreased,and the change in total nitrogen and ammonium nitrogen content were not obvious.The pH of soil treated with RSD and CK showed an increasing and decreasing trend,respectively,which was related to the balance between the consumption of H+by denitrification and the production of organic acids from straw decomposition.Compared with-RSD treatment,root-knot nematodes in soil treated with RSD were effectively inhibited,and the elimination rate reached 79.6%.Compared with CK treatment,the weight of individual melons increased by 0.091 kg after the strong reduction treatment,there was no statistically significant difference(P>0.05),and the sugar content of the subsequent melon crop was significantly improved(P<0.05).This study provides a reference for large-scale demonstration and promotion of irrigation and strong reduction technology to promote the green and high-quality development of facility melon and vegetable crops.
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