Study On The Difference Of Soil Nutrient Management At Different Scales

In this paper,the spatial variability of soil nutrients such as total nitrogen,available phosphorus,available potassium,and organic matter in small-and large-density sampling sites obtained at two different scales of township and village were analyzed using traditional statistics and geostatistical methods.Spatial interpolation analysis of soil nutrients was conducted based on trend effects and interpolation model selection.On the basis of past research and experimentation by the researchers,the spatial data analysis of spatial interpolation results of two scales and large-scale land right weight maps of 1:5000were conducted.According to the classification of soil nutrients in the County of Shouxian,the spatial distribution of soil nutrients such as total nitrogen,available phosphorus,available potassium and organic matter was obtained.By analyzing the differences in the density of different sampling points at the township and village levels,we can infer the reasonable sampling density and the precise management of nutrients at the larger scale.The conclusions of this article are as follows:(1)Through descriptive statistical analysis,the four soil nutrients at the township andvillage levels are all at a moderate degree of variation.-(2)From the influencing factors of spatial variability of soil nutrients,it can be seen that town-level available phosphorus and available potassium are mainly caused by structural factors(natural factors)such as climate and topography,and the combined effects of human factors and structural factors affect total nitrogen and organic matter.The spatial variability;the spatial variability of available phosphorus in villages is dominated by structural factors,and the spatial variability of total nitrogen,organic matter,and available potassium is dominated by both human and structural factors.(3)The spatial patterns and grades of the four nutrients showed the content of soil nutrients.According to the distribution of spatial patterns,the spatial distribution of soil nutrients at the town level cannot be used for the detailed management of the spatial distribution of soil nutrients at the village level.The spatial interpolation of soil nutrients at large-scale village scales is precise.From the aspect of grade distribution,the distribution of soil nutrient grades under the village-level large-density sampling is more obvious than that under thetown-level small density.When the soil sampling points are set and the soil nutrients of farmer plots are managed and researched,high-precision,high-density and reasonable sampling point density settings can better reflect the spatial changes of soil nutrients.