> Major Plant Nutrient Release in Jasmine Rice Growing Soils Amended with Biochar and Organic Wastes: An Incubation Study

摘要

< 0.05 level and highly significant at the p < 0.01 level using SPSS software. Results: CSW and CTS contained high OM content, 727.2 and 663.7 g kg ~( -1 ) , respectively, resulting in high C:N ratio even though they also had high total N content (6.83-7.79 g kg ~( -1 ) ). The CSW also had higher total K content (10.18 g kg ~( -1 ) ) than did CTS, RHA and RHB (1.3-5.41 g kg ~( -1 ) ). Total P quantity in these organic materials varied little and was in a small amount ranging from 0.76-1.28 g kg ~( -1 ) . The RHA and RHB significantly released greater available N and P than did CSW and CTS while the CSW and CTS clearly releasing more available K. Available K was constantly released from these materials throughout the incubation period whereas most of available N was freed within1 month and the amount declined markedly afterwards. Release patterns of N, P and K were similar among soils, indicating that different soil properties played a little part in the availability of major plant nutrients released from these soil amendments. Conclusion: This study suggested a potential use of biochar and organic wastes as soil amendments and an enhancement of major plant nutrients in Jasmine rice growing paddy soils.]]>