Both katB, a catalase gene, and oxyR, a peroxide sensor gene, play important roles in oxidative resistance and optimal nitrogenase activity. This study sets the foundation to explore the defensive mechanism of nitrogenase activity against oxidative damage in nitrogen-fixing bacteria. The distribution of potassium in different aggregate fractions was adjusted by acidification improvement for red soil. Moreover, the proportion of potassium stock in aggregate fractions was varied by adjusting pH. The result could guide the improvement of potassium stock in red soil under acidification conditions.

The proportion of exchangeable K (EK) and non-exchangeable K (NEK) stocks in aggregates at different pH levels in soils with three fertilization patterns

Reasonable substitution of organic fertilizer for chemical fertilizer can coordinate crop yield and environmental effect. Substituting stored swine fertilizer mixed with biochar for compound fertilizer reduced gaseous N losses by 7.6 percent, and increased N uptake by 54.1 percent and yield by 7.3 percent in vegetable system. Reasonable organic manure substitution provides decision support for agricultural green development.