Optimizing N-Fertilizer Inputs for Rice Production in Coastal Saline Based on a Biogeochemical Model and Dichotomy

LI Qiang; LI Jianguo; ZHANG Zhongqi; MAO Peng

doi:10.13961/j.cnki.stbctb.20180426.001

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Optimizing N-Fertilizer Inputs for Rice Production in Coastal Saline Based on a Biogeochemical Model and Dichotomy

- Optimizing N-Fertilizer Inputs for Rice Production in Coastal Saline Based on a Biogeochemical Model and Dichotomy
- Bulletin of Soiland Water Conservation Vol. 38, Issue 3, Pages: 167-173(2018)
- 作者机构：
  
  江苏师范大学地理测绘与城乡规划学院,江苏,徐州,221116
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.20180426.001
  CLC：
- Published：2018
- 稿件说明：
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LI Qiang, LI Jianguo, ZHANG Zhongqi, et al. Optimizing N-Fertilizer Inputs for Rice Production in Coastal Saline Based on a Biogeochemical Model and Dichotomy[J]. Bulletin of Soiland Water Conservation, 2018, 38(3): 167-173.
DOI：

LI Qiang, LI Jianguo, ZHANG Zhongqi, et al. Optimizing N-Fertilizer Inputs for Rice Production in Coastal Saline Based on a Biogeochemical Model and Dichotomy[J]. Bulletin of Soiland Water Conservation, 2018, 38(3): 167-173. DOI： 10.13961/j.cnki.stbctb.20180426.001.

摘要

[目的

]

探讨滨海盐渍土水稻田的最佳施氮量，为研究区科学施氮提供一定决策依据。[方法

]

基于DNDC模型与数学二分法，模拟水稻在加施10%，20%，30%和减施10%，20%，30%等6种施氮条件下产量变化特征，划定最佳施氮量所在区间，并对最佳施肥量下的环境效益进行评价。[结果

]

①在减施10%，20%，30%和增施10%，20%，30%氮肥时，水稻产量依次为6 431.67，5 939.22，5 439.66 kg/hm

和7 686.51，7 739.94，7 739.94 kg/hm

；②最佳施氮区间在增施10%~20%，即施氮区间为519.0~566.18 kg/hm

。经二分法测算，该地最佳施氮量为528.214 kg/hm

；③采用该最佳施氮量时，水稻种植期间总氮氧化合物排放量为9.24 kg/hm

，具有良好环境效益。[结论

]

水稻全生长期内施用528.214 kg/hm

的氮肥，滨海盐渍土水稻田产量达到最大值，兼具良好环境效益。

Abstract

[Objective] Determing the optimal amount of N-fertilizer inputs for rice production is significant to improve the agricultural management in the coastal saline reclamation area

Eastern China.[Methods] Combining denitrification decomposition model(DNDC) and dichotomy method

this study simulated rice yield dynamics during the whole life cycle under six fertilization situations (10%

20%

30%

-10%

-20% and -30% of additional N-fertilizer inputs). And the optimal interval of N-fertilizer inputs and corresponding ecological impacts were explored.[Results] ① The rice yield in the study area was 6 431.67

5 939.22

5 439.66

7 686.51

7 739.94 and 7 739.94 kg/hm2 10%

20%

30%

-10%

-20% and -30% N-fertilizer inputs

respectively. ② The optimal interval of fertilization was from 10% to 20% of additional fertilizer inputs

namely

519.0~566.18 kg/hm2 of N-fertilizer inputs. And the optimal N-fertilizer inputs was 528.214 kg/hm2

according to dichotomy analysis. ③ Based on the optimal amount of N-fertilizer inputs

the nitrogen oxide emission was 9.24 kg/hm2 during full rice growth period

which showed a good environmental benefit.[Conclusion] The optimal amount of N-fertilizer inputs during rice production in the study area is 528.214 kg/hm2. This optimal N-fertilizer inputs

can improve the rice yields of saline soil to the top level and produce a better environmental benefit.

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