Analysis of phosphorus fertilizer demand and reducing potential of main crops in Hainan Island
Based on the nutrient requirements of major crops in Hainan Island,combined with the current planting structure characteristics and the characteristics of phosphorus fertilizer application in crop systems,the phosphorus fertilizer demand and reducing potential in this region were evaluated,and the structural characteristics of phosphorus fertilizer products applied in farmland and existing problems were identified.Through field surveys,information on the phosphorus fertilizer application intensity and phosphorus fertilizer product structure of major crops such as grains,vegetables,and fruits in Hainan Island was collected to clarify the phosphorus balance status in the major crops in Hainan Island.At the same time,the recommended phosphorus fertilizer rates for the major crops were evaluated,and the phosphorus fertilizer reducing targets for the major crops were determined by analyzing the total reasonable demand for phosphorus fertilizer in Hainan Island.The results show that the average phosphorus fertilizer application intensity for farmland crops in Hainan Island was 95.68 kg·hm-2(as P),which was 62.17%higher than the national average.Among them,the average input of chemical phosphorus fertilizer were 87.59 kg·hm-2,and the average input of organic phosphorus fertilizer was 8.09 kg·hm-2,with an organic substitution ratio of 8.46%.The overall phosphorus surplus of crops in Hainan Island was relatively high,with 30.00 kg·hm-2 for grain crops,94.64 kg·hm-2 for vegetable crops,and 155.00 kg·hm-2 for fruit crops.As of 2021,the annual average phosphorus fertilizer consumption in Hainan Island was 242,800 tons(as P2O5),and the overall P fertilizer reducing potential was 59.90%.High-phosphorus balanced compound fertilizers are the main phosphorus fertilizer products used,accounting for 78.46%of the total phosphorus input.Currently,Hainan Island has a serious problem of excessive application of phosphorus fertilizer,with high phosphorus surplus and environmental risks,while the organic substitution ratio was low,indicating significant potential for reducing phosphorus fertilizer usage.These results provide important reference for the scientific application of phosphorus fertilizer in Hainan Island.
NETL
NSTL
万方数据
