Study on Characteristics of Decomposing and Nutrients Releasing of Green Manures in Orchards

doi:10.11924/j.issn.1000-6850.2014-0342

Abstract

Abstract: Lolium perenne L., Medicago sativa L., Festuca elata Keng ex E. Alexeev, Cichorium intybus L. are 4 of the main green manures in orchards. Decomposing and nutrients releasing characteristics of these 4 green manures were investigated in this study by using the method of nylon net bag in winter and summer, for the purpose of providing theory basis for orchard grass cultivation, soil fertility improvement and rational fertilization. The results showed that there were no significant difference in decomposing and nutrients releasing characteristics among 4 green manure crops. When incubated in summer, all these green manures had an initial rapid decaying and then a slow decaying; when incubated in winter, they showed slow-rapidslow releasing trend. The releases of different nutrients in green manures were varied. Potassium was released rapidly and completely, and nitrogen and phosphorus were released relatively slowly. After 45 days incubation in summer, the decomposition rate of these 4 green manure crops were all about 70%, while in winter after as long as 180 days incubation, they could reach the same decomposition rate, which showed that soil temperature had significant effects on decomposing.

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