[1]ZHANG Zhong-qi,YU Fa-zhan,LI Bao-jie.Spatial Variation Characteristics and Reasonable Sampling Size of Soil Available Nitrogen[J].Research of Soil and Water Conservation,2013,20(02):66-68,72.
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Spatial Variation Characteristics and Reasonable Sampling Size of Soil Available Nitrogen
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
20
Number of periods:
2013 02
Page number:
66-68,72
Column:
Public date:
2013-04-28
- Title:
- Spatial Variation Characteristics and Reasonable Sampling Size of Soil Available Nitrogen
- Keywords:
- soil available nitrogen; spatial variability; reasonable sampling size; northern Jiangsu province
- CLC:
- S135.6+21
- DOI:
- -
- Abstract:
- Understanding the spatial distribution characteristics of soil available nitrogen is the precondition for making agricultural and environmental policies. Determination of reasonable sample size is the base of obtaining the distribution characteristics of soil available nitrogen efficiently. On the basis of 148 soil sampling points, the spatial distribution characteristics of soil available nitrogen were analyzed, and the reasonable sample sizes were estimated by the regional random sampling theory. The results indicated that the mean soil available nitrogen content was 109.97 mg/kg, and its coefficient of variation was 0.29. The available nitrogen content was higher in the central and southeastern regions of the study area. At 95% confidence level, the reasonable sampling sizes were 69 and 27 samples, respectively, with respect to the corresponding 5% and 10% error grades. Accordingly, the sample sizes were 56 and 20, respectively, at the 90% confidence level. The research results can provide reference for making efficient sampling strategy in terms of soil nutrient survey in this region.
- References:
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1900-01-01