Optimal Water-Fertilizer Combinations for Efficient Nitrogen Fixation by Sugarcane at Different Stages of Growth

High fertilizer application and over-irrigation in sugarcane systems can cause considerable N2O emissions. Optimized water-fertilization management which reduces emissions, while maintaining biomass, is crucial, but may affect nitrogen fixation by sugarcane. This study evaluated the combined effect of on biomass field trials southern China. Treatments included drip spray irrigation, with three levels (0% (low), 50% (medium), 100% (high)) irrigation fertilizer. A rain-fed crop (no or fertilizer) was as control. The results showed that (1) medium water high fertilization increased biomass. optimum combination elongation stage fertilization, best choice for maturity stage. (2) For (δ15N) content, seedling tillering stages. fertilization. (3) soil (δ15N content), proved optimal seedling, tillering, (4) In stage, content) found to be strongly correlated leaf area index, water, temperature, electrical conductivity. Soil photosynthesis temperature. conclusion, appears most suitable planting, treatment stages water-high water-medium water-fertilizer combinations identified here provide a scientific basis optimization China other regions similar environments.