Effects of stabilized N fertilizer combined with straw returning on rice yield and emission of N2O and CH4 in a paddy field

doi:10.13287/j.1001-9332.201904.026

Abstract

Abstract: Based on a two-year field experiment located at Shenyang Applied Ecological Experiment Station of Chinese Academy of Sciences, we examined the effects of stabilized N fertilizer combined with straw returning on rice yield and emission of N₂O and CH₄ in aquic brown soil. Six treatments were set up, i.e. control (CK), urea(U), urea+urease inhibitor+nitrification inhibitor (U+I), straw (S), straw+urea (S+U), straw+urea+ urease inhibitor+nitrification inhibitor (S+U+I). The results showed that urea application increased rice yield, cumulative N₂O and CH₄ emission, and global warming potential. The treatment of U+I significantly mitigated cumulative N₂O emission. Returning rice straw to the field significantly increased cumulative N₂O emission, cumulative CH₄ emission, global warming potential, and greenhouse gas emission intensity. The S+U+I treatment had the highest rice yield and greenhouse gas emission intensity. U+I treatment had the the second highest rice yield and the lowest greenhouse gas emission intensity. Rice yield in the S treatment showed no significant difference with CK. Our results indicated that S+U+I and U+I are relatively better agricultural strategies compared with other treatments in paddy fields on aquic soil.

Key words: CH₄ emission, rice, straw returning, N₂O emission, stabilized fertilizer, yield

WU Kai-kuo, ZHANG Li-li, SONG Yu-chao, LI Yu-hua, GONG Ping, WU Zhi-jie, YANG Li-jie, LI Dong-po. Effects of stabilized N fertilizer combined with straw returning on rice yield and emission of N₂O and CH₄ in a paddy field[J]. Chinese Journal of Applied Ecology, 2019, 30(4): 1287-1294.

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Effects of stabilized N fertilizer combined with straw returning on rice yield and emission of N₂O and CH₄ in a paddy field

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