Green manure returning effect of Amaranthus hypochondriacus harvested at different times on soil fertility

doi:10.11686/cyxb2015415

Abstract

Abstract: In order to study the returning effect of Amaranthus hypochondriacus on soil fertility, an incubation experiment was carried out to simulate the returning of A. hypochondriacus as green manure to the field. The dynamic change in concentrations of DOC (soil dissolved organic carbon), Nmin (mineral nitrogen), available potassium and slowly released potassium was measured in the soil with plants harvested on 45, 55 and 65 d after growth. During the first 14 d of incubation, the concentrations of soil DOC, Nmin, available potassium and slowly released potassium increased significantly compared to the control. Apparent nitrogen release rate in A. hypochondriacus was more than 19.5%, and for potassium, it was above 63.4%. During 14-56 d of incubation, soil Nmin, available potassium, slowly released potassium concentrations showed the order as sample harvested on 45 d after growth>55 d>65 d>Control, but there were no differences in soil NH₄⁺-N and DOC concentration between the treatments and control (for NH₄⁺-N, sample harvested on 45 d as an exception). After 56 d of incubation, Nmin concentration in the soil was 3.4 times of that under Control, available potassium concentration was at least 3.1 times and slowly released potassium concentration was at least 1.1 times under all treatments with A. hypochondriacus. In addition, the treatments using A. hypochondriacus harvested on 45 d resulted in lower apparent release rates of nitrogen and potassium than the other two treatments using A. hypochondriacus during the incubation. Conclusively, returning A. hypochondriacus to soils obviously improved soil available nutrients, and the plants harvested on 45 d showed better effect on soil fertility.

CHEN Guo-Jun, YAN Hui-Feng, WU Kai, YANG Ju-Tian, TIAN Lei, TAN Xiao-Lei, ZONG Hao, CHEN Xiu-Zhai, ZHANG Yong-Chun, SUN Yan-Guo, LIU Hai-Wei, SHI Yi. Green manure returning effect of Amaranthus hypochondriacus harvested at different times on soil fertility[J]. Acta Prataculturae Sinica, 2016, 25(3): 215-224.

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