To scientifically determine the nitrogen application rate for watermelon in China,the method of"scattered experimental data integration"and the method of"nutrient balance and target yield minus soil fertility yield"were employed to explore the abundance index(ALI)of soil alkaline hydrolysis nitrogen and organic matter and the recommended soil fertilizer application rates(RSFAR)for watermelon planting in China.The results showed that the ALI of soil alkaline hydrolysis nitrogen for watermelon planting in China from the first to the eighth level was≥298,187-298,117-187,73-117,46-73,29-46,18-29,18 mg/kg,respectively.The ALI of soil total hydrolysis nitrogen from the first to the eighth level was≥7.0,3.5-7.0,1.7-3.5,0.9-1.7,0.5-0.9,0.2-0.5,0.1-0.2 g/kg and＜0.1 g/kg,respectively.The ALI of soil organic matter from the first to the eighth level was≥65,32-65,16-32,8-16,4-8,2-4,1-2 g/kg and＜1 g/kg,respectively.When the N fertilizer use efficiency was 30%-50%and the target yield was 30-90 t/hm2,the range of the RSFAR of N for the first to the eighth level was 0,12-60,24-120,36-180,48-240,60-300,72-360,84-420 kg/hm2,respectively.The recommended fertilization system of N in China's watermelon soil was established preliminarily,which could provide a scientific basis for watermelon soil testing and fertilization.
Watermelonsoil testing and fertilizer recommendationsoil nutrientabundance-deficiency indexfertilizer application rate
维普
万方数据
