Accurate information about current soil nutrient concentrations in orchards is necessary for making recommendations about future fertilizer application rates. Additional information is needed about the amount of surplus soil N in the orchards of Shaanxi Province, which is the main apple and kiwi production region in China. Analysis of N inputs and soil N loading is important for N management in orchards. The objective of this study was to quantify both the N application rates and the amount of surplus soil N in orchards in Shaanxi Province. Soil samples were collected from orchards in different parts of Shaanxi Province and then analyzed to determine soil N concentration. Additional information was collected from farmer interviews and an agricultural statistics database. The data was analyzed using the N balance method. The results showed that N fertilizer application rates averaged 927.2 kg N / hm 2 among the orchards surveyed in this study. More than 40% of the chemical N fertilizer was applied in the form of urea. Manure application accounted for 139.4 kg N / hm 2. Nearly 95% of the orchards had surplus N, with an average surplus of 876.3 kg N / hm 2. Nearly, 58% of the orchards had an N surplus of more than 500 kg N / hm 2. More than 27% of the orchards had an N surplus of more than 1000 kg N / hm 2. Among the different kinds of orchards, kiwi orchards had the highest N input rate (1432.9 kg N / hm 2) and the highest amount of surplus N (1186.9 kg N / hm 2). In irrigated areas of central Shaanxi rain鄄fed region. There was positive correlation between http: / / www.ecologica.cn the amount of surplus N and the N application rate. High N inputs to orchards in some regions of Shaanxi Province led to very high soil N loading. This will increase environmental risks in the region.
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