Study on Abundance-deficiency Index of Soil Nitrogen and Recommended Nitrogen Fertilizer Application Rates for Tomato in China
In order to provide a theoretical basis for nitrogen(N)application in tomato soil testing,the abundance-deficiency index(ADI)of soil N and the recommended N fertilizer application rate(RNFAR)for tomatoes in China were established by using the method of integrating piecemeal experiment data and the new application formula of nutrient balance-soil fertility difference subtraction.The results showed that ADIs of soil alkaline hydrolysis N for tomatoes in China from the 1st to 7th levels were ≥303.1,189.5-303.1,118.5-189.5,74.1-118.5,46.3-74.1,29.0-46.3 and＜29.0 mg/kg,respectively;ADIs of soil total N for tomatoes in China from the 1st to 7th levels were ≥3.0,2.0-3.0,1.3-2.0,0.8-1.3,0.6-0.8,0.4-0.6 and＜0.4 g/kg,respectively;ADIs of soil organic matter(all fields)for tomatoes in China from the 1st to 6th levels were ≥77.3,36.6-77.3,17.4-36.6,8.2-17.4,3.9-8.2 and＜3.9 g/kg,respectively;ADIs of soil organic matter(open fields)for tomatoes in China from the 1st to 7th levels were ≥55.3,32.8-55.3,19.4-32.8,11.5-19.4,6.8-11.5,4.1-6.8 and＜4.1 g/kg,respectively;ADIs of soil organic matter(facility fields)for tomato planting in China from the 1st to 4th levels were ≥43.4,14.6-43.4,4.9-14.6 and＜4.9 g/kg,respectively.When N fertilizer use efficiency was 40％in tomato season and projected tomato yield was 120 t/hm2,RNFAR from the 1st to 7th levels of soil N abundance-deficiency were 0,81,162,243,324,405 and 486 kg/hm2,respectively.
TomatoSoil testing and fertilizer recommendationSoil nutrientNitrogenAbundance-deficiency indexFertilizer application rate
万方数据
维普
