Effects of Mineral Fertilization and Organic Amendments on Rice Grain Yield, Soil Quality and Economic Benefit in Newly Cultivated Land: A Study Case from Southeast China

Low soil fertility and low microbiological activity have been widely observed in certain newly cultivated lands. To develop effective agricultural management practices that can improve quality rapidly, a field experiment was conducted on paddy fields reclaimed from unused, low-slope, hilly wasteland Quzhou City, Zhejiang Province, Southeast China. The six treatments were applied included (1) control (CK), no crops planted fertilizers applied; (2) R, rice without fertilization; (3) RR, rice–ryegrass rotation fertilizer application; (4) RRM, with the application of mineral fertilizer; (5) RRMO, organic manure; (6) RRMH, humic acid application. results showed ryegrass cropping improved amounts C (SOC) by 115–296% particulate (POC) 162–256% (p < 0.05). Additionally, RRMO treatment had highest index value (0.81), which significantly higher 0.05) than other treatments. random forest model N-related properties (including urease activity, total N, N), C-related SOC, POC, cellulase activity), available P could explain response yield to different fertilization strategies. Compared CK, land grades RRMH increased Grade 9 7. However, obtained net profit farmland quota trading. Overall, are suggested rapidly productivity maximize economic benefit utilization, respectively.