Soil aeration improves tomato fruit yield by regulating root characteristics and soil nitrogen cycle

Area of Science:

• Agricultural Science
• Soil Science
• Plant Physiology

Background:

• Soil aeration is crucial for root development and nutrient dynamics, impacting tomato yield.
• Mechanisms linking soil aeration techniques to root characteristics and nitrogen cycling are not fully understood.

Purpose of the Study:

• To evaluate the effects of micro-nano bubble aeration and underground air layer treatments on soil oxygen, root morphology, nitrogen cycling, and tomato yield.
• To provide practical recommendations for optimizing tomato production through soil management.

Main Methods:

• A two-season field experiment in Xi'an, China, using micro-nano bubble aeration (N1, N2) and underground air layer treatments (L1, L2).
• Measurements included soil O2/CO2, root morphology/activity, root extract concentrations, soil nitrogen forms (NO3--N, NH4+-N), and tomato yield.

Main Results:

• Both aeration treatments significantly increased soil oxygen and improved root morphology, activity, and extract concentrations, leading to higher tomato yields.
• Soil aeration altered nitrogen cycling, increasing nitrate (NO3--N) and decreasing ammonium (NH4+-N).
• Recommended soil moisture is 60%-90% field capacity; N2 for short-term, air layer for long-term cultivation.

Conclusions:

• Soil aeration techniques effectively regulate root systems and soil nitrogen dynamics, enhancing tomato yield.
• Micro-nano bubble aeration and underground air layers offer viable strategies for improving agricultural productivity.
• Optimized soil aeration, combined with appropriate soil moisture management, is key for maximizing tomato fruit yield.