Combined Effects of Soil Water Regimes and Rice Straw Incorporation into the Soil on 15N, P, K Uptake, Rice Yield and Selected Soil Properties

Understanding the effects of water regimes on nutrient uptake of rice plants, especially by different organic fertilizers is critical to improve long-term rice productivity.In a greenhouse experiment, the effects of soil water management and incorporation of rice straw into the soil on nutrient uptake, soil properties and rice productivity were studied in a clay soil.The treatment included two levels of soil water regimes (continuous submergence and alternate submergence-drying) and four rice straw levels (0, 5, 10 and 15 t ha -1). Results showed that, soil pH decreased slightly with increasing rate of rice straw application in both continuous submergence and alternate submergence-drying.Soil Eh values were correlated to rice straw application levels.Alternate submergence-drying in rice plant for some period of time significantly increased rice growth parameters and rice yield.Nitrogen