Equivalent incorporation of Chinese milk vetch and rice straw enhanced nutrient mineralization and reduced greenhouse gas emissions. Issue 1 (2nd January 2022)

• Record Type: Journal Article
• Authors: Aljerib, Yahya Mohammed; Geng, Mingjian; Xu, Peidong; Li, Donghui; Rana, Muhammad Shoaib; Zhu, Qiang
• Is Part Of: Soil science and plant nutrition. Volume 68:Issue 1(2022)
• Page Start: 167
• Page End: 174
• Publication Date: 2022-01-02
• Subjects: Carbon dioxide -- green manure -- methane -- microbial biomass carbon -- rice straw returning; Soil science -- Periodicals; Plants -- Nutrition -- Periodicals; 631.4
• DOI: 10.1080/00380768.2022.2032334
• Languages: English
• ISSNs: 0038-0768

Abstract

ABSTRACT: Incorporation of crop residues into the soil provides essential nutrients and increases carbon stocks, which also increases greenhouse gas emissions from the soil. The present study was conducted to determine the effect of co-incorporation of Chinese milk vetch (CMV) and rice straw (RS) at different mixing rations on the dynamics of nutrient mineralization and the emissions of CO2 and CH4 . The Fluvo-aquic paddy soil was collected and mixed with crop residues at 20 g kg −1 soil and incubated for 187 days. The CMV and RS were incorporated with the ratios of 100%:0% (M100 ), 75%:25% (M75 S25 ), 50%:50% (M50 S50 ), 25%:75% (M25 S75 ), and 0%:100% (S100 ), respectively. Results showed soil total nitrogen (N) concentrations were higher with the higher proportion of CMV in the mixing residues. At 8 days of incubation (DOI), both soil available phosphorus (P) and potassium (K) concentrations were greater in treatments with the higher ratio of RS, but there were no significant differences among M75 S25, M50 S50, M25 S75, and S100 at and after 37 DOI. The CO2 emission rate of M100 was significantly higher than that of other treatments at 8 and 12 DOI. Even though the CH4 emission rate of M50 S50 was significantly higher than that of other treatments at 8 DOI, S100 resulted in the significantly higher cumulative production of CH4 after 22 DOI. Predicted from the exponential regression models, S100 had the highest CO2 -C and CH4 -C mineralization potentials. Additionally, the M50 S50 treatment resulted in 3.7%-54.7% higher microbial biomass carbon (MBC) concentration than other treatments at the end of the incubation. In summary, the mixing ratio of 1:1 was recommended for the co-incorporation of CMV and RS by considering both the nutrients availability and the greenhouse gas emissions.