Effect of Incorporation Levels of Green Manure Crops on Rice Yield and Soil Chemical Properties

Abstract

This study was conducted to investigate rice yield and soil chemical properties affected by incorporation levelsof green barley (GB) and hairy vetch (HV). The GB and HV were applied to the pots at 500, 1,000, 1,500, and2,000 kg 10-1 (GB500, GB1000, GB1500, GB2000, HV500, HV1000, HV1500, and HV2000, respectively),and inorganic fertilizer (N-P-K = 9-4.5-5.7 kg 10a-1) treatment as control. After rice harvesting, chemicalproperties of soil such as pH, OM, T-N, and available P2O5 in GB and HV treated treatments were improvedover those in Control treatment. The rice yield ranged from 433 to 512 kg 10a-1 for GB treatments and 490 to532 kg 10a-1 for HV treatments, indicating that rice yield was affected by incorporation levels of GB and HV. The rice yields in GB2000, HV1000, HV1500 and HV2000 treatments increased by 3.3, 3.1, 6.4 and 7.4%compared with Control treatment, respectively. Therefore, minimum incorporation level of GB and HV forincreasing rice yield was 2,000 kg 10a-1 of GB and 1,000 kg 10a-1 of HV.