Effects of Decomposing Microbial Inoculum on Decomposition and Nutrient Release Dynamics of Chamaecrista rotundifolia in Red Soil of Orange Orchards

DONG Chunhua, ZHOU Xuan, SUN Jimin, LUO Zhiyong, XIE Yi, HU Kexin

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Chinese Agricultural Science Bulletin ›› 2022, Vol. 38 ›› Issue (1) : 106-113. DOI: 10.11924/j.issn.1000-6850.casb2021-0204

Effects of Decomposing Microbial Inoculum on Decomposition and Nutrient Release Dynamics of Chamaecrista rotundifolia in Red Soil of Orange Orchards

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To clarify the decomposition and nutrient release of green manure combined with microbial inoculum in arid red soil, and to make better use of the nutrients, under field conditions, four treatments were conducted including control (CK), decomposing microbial inoculum (DM), decomposing microbial inoculum + biochar organic fertilizer (BM), and decomposing microbial inoculum + nitrogen-fixing bacteria (NM). The dynamic characteristics of decomposing and nutrient release of Chamaecrista rotundifolia in arid red soil of orange orchard were simulated by nylon-bag method, and the nutrient residual rate was also determined. The results showed that the rate of organic matter decomposition and nutrient release were the fastest in the first two weeks after turnover, and then decreased gradually. Ten days after turnover, the average daily decomposition rate of green manure straw was 3.319 g/d, and the average daily release rate of C, N, P and K was 1.765, 0.124, 0.009 and 0.090 g/d, respectively. The average daily decomposition rate of green manure straw from the 10 th to 70th day after turnover was 0.531 g/d, and the average daily release rate of C, N, P and K was 0.230, 0.014, 0.002 and 0.007 g/d, respectively. On the 70th day of the decomposition of green manure, the cumulative reduction rate of straw mass treated by CK, DM, BM and NM treatment was 67.96%, 73.72%, 79.73% and 76.68%, respectively; and the cumulative release rate of C under the four treatments was 70.07%, 76.84%, 85.07% and 77.70%, respectively; the cumulative release rate of N was 78.00%, 82.20%, 85.34% and 83.81%, respectively; the cumulative release rate of P was 81.27%, 84.85%, 91.74% and 85.08%, respectively; the cumulative release rate of K was 97.58%, 98.39%, 98.45% and 98.36%, respectively. The nutrient release rate of straw of Chamaecrista rotundifolia under different treatments was in the range of K > P > N > C, and BM treatment had the fastest rate of decomposition and nutrient release. Considering the decomposition of green manure and nutrient release comprehensively, the application of decomposing microbial inoculum in combination with Chamaecrista rotundifolia and turnover could effectively improve the soil microbial structure, increase the rate of decomposition and the efficiency of nutrient release in arid red soil.

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orange orchard / decomposing microbial inoculum / green manure / Chamaecrista rotundifolia / decomposition / nutrient release

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DONG Chunhua , ZHOU Xuan , SUN Jimin , LUO Zhiyong , XIE Yi , HU Kexin. Effects of Decomposing Microbial Inoculum on Decomposition and Nutrient Release Dynamics of Chamaecrista rotundifolia in Red Soil of Orange Orchards. Chinese Agricultural Science Bulletin. 2022, 38(1): 106-113 https://doi.org/10.11924/j.issn.1000-6850.casb2021-0204

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