Effects of Returning Straw and Milk Vetch on Rice Growth and Greenhouse Gas Emissions

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DOI: https://doi.org/10.30564/re.v3i2.3267

Abstract:

The effects of different nitrogen application levels on rice yield and greenhouse gas (NO₂, CH₄) emissions from rice fields under the combined action of straw and milk vetch. Two treatments were set up in the main area of this experiment: R₀ (no straw returned to the field, 0); R₁ (amount of straw returned to the field under normal conditions, 6000 kg·hm^-2). Before turning the straw back into the field, use a circular knife to cut the straw into 10~13 cm.And 3 kinds of nitrogen application treatments in the sub-district: N₁ (no nitrogen application, 0), N₂ (nitrogen application, 15 kg·hm^-2), N₃ (nitrogen application, 30 kg·hm^-2), two-factor cross-combination,and a non-nitrogen control CK, total of 7 treatments. The results showed that in 2017, early rice R₁N₂ treatment increased the most obvious yield, which was 32.44% higher than CK, and late rice R₁N₁ treatment increased the most significantly, which was 17.91% higher than CK. CH₄ emission is positively correlated with the straw returned to the field. N₂O is the opposite. The N₂O emission flux was highest in the treatment of R₁N₃, and the CH₄ emission flux was the highest in the treatment of R₁N₂.

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