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Received: November 7, 2017 Revised: November 17, 2017 Accepted: November 17, 2017 No-tillage is an effective practice to save labor input and reduce methane emission from the paddy. Effects of tillage and cultivation methods on carbon accumulation and soil properties were investigated in the treatments of tillage-transplanting (T-T), tillage-wet hill seeding (T-WS), minimum tillage-dry seeding (MT-S) and no-tillage dry seeding (NT-S) of rice. Soil carbon was higher in NT-S and MT-S, compared to T-T and T-WS. In NT-S and MT-S, soil carbon contents were the highest in the top soil (5 cm depth) and decreased with soil depth. In T-T and T-WS, however soil carbon contents showed no significant difference up to soil depth of 15 cm from the top. Carbon content was the highest in the soil particle size under 106 μm and decreased as the soil particle size increased.

Effects of Tillage and Cultivation Methods on Carbon Accumulation and Formation of Water-stable Aggregates at Different Soil Layer in Rice Paddy