Simulation of nitrogen dynamics in soil using infocrop model.

Area of Science:

• Agricultural Science
• Agronomy
• Environmental Science

Background:

• Nitrogen is a critical fertilizer nutrient, essential for crop growth but often deficient.
• Inefficient nitrogen management leads to reduced crop yields and environmental losses.
• Climate change poses significant risks to cereal production and food security.

Purpose of the Study:

• To understand soil nitrogen dynamics and rice growth under varied nitrogen inputs.
• To evaluate the impact of climate change on nitrogen use efficiency and crop yields.
• To utilize simulation models for optimizing fertilizer management and land use planning.

Main Methods:

• Field experiments were conducted to collect data on rice growth and yield.
• The InfoCrop model was calibrated and validated using historic and experimental data.
• Simulation tools were employed to analyze soil nitrogen balance and climate change impacts.

Main Results:

• Simulated results accurately reflected observed rice growth, yield, and nitrogen uptake.
• Varying nitrogen levels significantly altered soil nitrogen balance components.
• Increased temperatures led to higher soil nitrogen losses (denitrification, volatilization, N2O emissions) and reduced rice grain and biomass yields.

Conclusions:

• The InfoCrop model effectively simulates soil nitrogen dynamics and crop responses.
• Climate change, particularly increased temperatures, negatively impacts nitrogen use efficiency and crop productivity.
• Further validation in diverse agro-climatic conditions is recommended.