盐化灌淤土壤速效氮、磷、钾空间变异性与棉花生长关系初步研究

A Study on Relationship Between the Spatial Variability of Saline Anthropogenic alluvial Soil Available Nitrogen, Phosphorous, Potassium and Cotton Growth

以 5m× 5m网格布点采集灌淤土壤土样 ,分析测定了各样点碱解氮、速效磷、速效钾含量 ,用传统统计学方法确定了其田间合理取样数目 ,用地统计学方法建立了其空间变异模型和等值线图 ,确定了土壤速效氮、磷、钾养分的水平、垂直及时间变异特性。相关分析表明 ,花铃期土壤碱解氮与棉花产量呈显著正相关 ,播前表层土壤速效磷与产量呈显著正相关 ,而播前土壤表层速效钾与棉花产量呈显著负相关。

By sampling and testing content of available nitrogen, phosphorous, potassium for saline anthropogenic alluvial soil with 5 m×5 m grid, the relationship between the spatial variability of these nutrient elements and cotton growth was studied. The reasonable sampling numbers of soil available nitrogen, phosphorous, potassium were given at determinate reliable level by the method of traditional statistics ,their semi variogram maps and contour maps were presented by the method of geostatistics, and their horizontal vertical spatial variability and time variability with the growth of cotton were given. The relative analysis of soil available N,P,K and cotton yield showed: the correlation of available nitrogen for full boll and cotton yield was outstanding positive; and of available phosphorous before sowing(0-20 cm) was outstanding positive; the correlation of available potassium of soil(0-20 cm) before sowing and cotton yield was outstanding negative. The study provided the basic data and theoretical basis for realizing precise management of nutrient and increasing experimental effectiveness.