JoVE - Journal of Visualized Experiments
JoVE Visualize
Contact Us

Spatial benefit difference of fertilizer reduction and substitution policy based on grid scale: A case study of the Heihe River Basin

  • 0College of Management and Economics, Tianjin University, Tianjin, 300072, China; Laboratory of Computation and Analytics of Complex Management Systems (CACMS), Tianjin University, Tianjin, 300072, China; Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China.
Journal of Environmental Management +

|

November 5, 2024

|

November 5, 2024

View abstract on PubMed

Summary

This summary is machine-generated.

Balancing organic and chemical fertilizers is key for green agriculture. Improving fertilizer efficiency alongside organic subsidies boosts crop yields and reduces emissions, aiding food security and sustainability.

Area Of Science

  • Agricultural Science
  • Environmental Science
  • Policy Analysis

Background

  • Green agriculture development requires balancing organic and chemical fertilizer use for food security and environmental sustainability.
  • Existing research lacks grid-scale economic and environmental impact assessments of fertilizer policies and their effects on diverse crops.
  • Previous models like SIMPLE-G were limited to single crops and did not simulate organic fertilizer substitution.

Purpose Of The Study

  • To develop and apply the SIMPLE-G-Heihe model for simulating green agricultural policy impacts on multiple crops in arid regions.
  • To address limitations of previous models by incorporating multiple crop types and organic fertilizer substitution.
  • To provide insights into optimizing fertilizer policies for economic and environmental benefits.

Main Methods

  • Development of the SIMPLE-G-Heihe model, an advancement of the SIMPLE-G model, to simulate green agricultural policies.
  • Simulation of the impacts of varying organic fertilizer subsidies and chemical fertilizer technology improvements.
  • Analysis of policy effects on crop yields, economic output, and environmental indicators (N2O emissions) at a grid scale.

Main Results

  • Increasing organic fertilizer subsidies alone is insufficient for significant yield enhancement; improved fertilizer utilization efficiency is crucial.
  • A combination of enhanced chemical fertilizer technology (8%) and organic fertilizer subsidies (3%) increases vegetable output value by 0.27% and reduces N2O emissions by 1.09%.
  • Significant reductions in fertilizer use were observed, particularly for vegetables in upstream areas and for wheat and maize in upstream and midstream areas of the Heihe River Basin.

Conclusions

  • Integrated policies combining technological improvements and targeted subsidies are effective for economic and environmental gains in agriculture.
  • Policy impacts exhibit spatial heterogeneity, with upstream areas showing significant fertilizer reduction, especially for vegetables.
  • The findings offer valuable insights for implementing flexible and spatially differentiated green agriculture strategies in China.

Keywords: