[Numerical evaluation of soil quality under different conservation tillage patterns].

Area of Science:

• Agricultural Science
• Soil Science
• Agronomy

Background:

• Traditional tillage practices can degrade soil health over time.
• Sustainable agricultural methods are crucial for maintaining long-term productivity and environmental quality.
• Understanding the impact of various tillage systems on soil properties is essential for optimizing crop production.

Purpose of the Study:

• To evaluate the effects of different tillage patterns on soil properties and grain yield.
• To assess soil quality under conservation tillage versus traditional tillage in a winter wheat-summer maize rotation.
• To determine the most beneficial tillage practices for both crop yield and soil health.

Main Methods:

• A 9-year field experiment was conducted on the Guanzhong Plain.
• Investigated subsoiling, rotary tillage, straw return, no-till seeding, and traditional tillage.
• Principal Component Analysis (PCA) was used for comprehensive soil quality evaluation.

Main Results:

• All conservation tillage methods improved soil fertility and physical properties compared to traditional tillage.
• Soil enzyme activities (urease, alkaline phosphatase) and soil quality index increased significantly under conservation tillage.
• Grain yield for winter wheat and summer maize increased by 13%-28% and 3%-12% respectively, with notable exceptions under no-till seeding with straw covering.
• Specific practices like subsoiling and straw return demonstrated significant yield and soil quality improvements.

Conclusions:

• Conservation tillage practices, particularly subsoiling and straw return, enhance soil quality and increase crop yields.
• These methods offer substantial economic and ecological advantages over traditional tillage.
• Promoting subsoiling and straw return is recommended for sustainable agriculture in the region.