Effects of Nitrogen Fertilizer Reduction Accompanied by Biochar Application on Yield and Nitrogen Accumulation of Rice at Various Growth Stages

XU Bin; WANG Xiaoli; MENG Ruoxi; YANG Hongwei; LONG Dayong; MEI Tingting; DUAN Jianjun

doi:10.19303/j.issn.1008-0384.2022.012.003

Volume 37 Issue 12

Dec. 2022

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Article Navigation > Fujian Journal of Agricultural Sciences > 2022 > 37(12): 1528-1535

XU B, WANG X L, MENG R X, et al. Effects of Nitrogen Fertilizer Reduction Accompanied by Biochar Application on Yield and Nitrogen Accumulation of Rice at Various Growth Stages [J]. Fujian Journal of Agricultural Sciences，2022，37（12）：1528−1535 doi: 10.19303/j.issn.1008-0384.2022.012.003

Citation:

XU B, WANG X L, MENG R X, et al. Effects of Nitrogen Fertilizer Reduction Accompanied by Biochar Application on Yield and Nitrogen Accumulation of Rice at Various Growth Stages [J]. Fujian Journal of Agricultural Sciences，2022，37（12）：1528−1535 doi: 10.19303/j.issn.1008-0384.2022.012.003

Citation:

XU B, WANG X L, MENG R X, et al. Effects of Nitrogen Fertilizer Reduction Accompanied by Biochar Application on Yield and Nitrogen Accumulation of Rice at Various Growth Stages [J]. Fujian Journal of Agricultural Sciences，2022，37（12）：1528−1535 doi: 10.19303/j.issn.1008-0384.2022.012.003

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Effects of Nitrogen Fertilizer Reduction Accompanied by Biochar Application on Yield and Nitrogen Accumulation of Rice at Various Growth Stages

doi: 10.19303/j.issn.1008-0384.2022.012.003

1.
College of Agriculture, Guizhou University, Guiyang, Guizhou　550025, China
2.
College of Tobacco, Guizhou University, Guiyang, Guizhou　550025, China

Received Date: 2022-04-07
Rev Recd Date: 2022-07-03

Available Online: 2022-12-28

Publish Date: 2022-03-28

Abstract

Abstract

Objective Effects of nitrogen fertilizer reduction accompanied by a biochar addition on the yield and nutrient conversion of rice plants were analyzed to promote straw waste utilization in paddy fields. Method In a field experiment, designated lots was assigned for fertilization on rice plants using either only P and K but no N fertilizer (CK), conventional 100% N fertilization (T0), 90% N fertilization with addition of 2.5 t·hm⁻² biochar (T1), 80% N fertilization with addition of 5.0 t·hm⁻² biochar (T2), 70% N fertilization with addition of 7.5 t·hm⁻² biochar (T3), or 60% N fertilization with addition of 10.0 t·hm⁻² biochar (T4). The triplicated treatments were arranged by random block group. Results The rice yield increased as the N fertilizer was increasingly reduced along with the added biochar to peak at the T2 treatment. The 10.22% increase over T0 was significant (P＜0.05), but it started to decline upon further reduction on N. The greatest N accumulation in the rice shoots was found under T2 as well as in the roots under T3 and at maturation. Under T1, T2, and T3, the N accumulations in the straws of a rice plant at maturity increased by 5.05%–15.96%, in the roots by 6.76%–19.00%, and the highest in the grains by 4.65%–21.45% over T0. The straw biomass, N partial productivity, and N agronomic efficiency increased by 5.34%–41.44%, 17.43%–63.81%, and 42.50%–85.93% over T0 under T1, T2, T3, and T4, respectively, while the apparent N utilization enhanced by 77.12%–106.79% with T2 being the most. The N harvest index of T1 was lower than T0, but higher than other treatments. Conclusion The 80% N fertilization with the addition of 5.0 t·hm⁻² biochar (T2) significantly increased the yield, N utilization efficiency, and N accumulation of the rice plants.
- Rice yields,
- biochar,
- growth period,
- nitrogen accumulation,
- nitrogen use efficiency

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References(35)

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