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A study on the Relationship between the Spatial Variability of Soil Chemical Characteristics and the Cotton Growth

Author: YangYuLing
Tutor: WenQiKai；TianChangYan
School: Xinjiang Agricultural University
Course: Soil
Keywords: Salinization of irrigated soil spatial variability of nutrient salt cotton
CLC: S154.4
Type: Master's thesis
Year: 2001
Downloads: 208
Quote: 0
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Abstract


Using geostatistical method , soil salinization of irrigated cotton field soil chemical properties of spatial patterns of cotton growth system . Traditional statistical analysis to prove the cotton fields of soil salinity and nutrient data are in line with the normal distribution to determine the field reasonable sampling number , press a certain confidence level and accuracy requirements ; the semivariogram function to characterize the spatial variability of soil chemical properties space variation model and parameters under which determine the soil chemical properties domain and kriging analysis of the corresponding contour map . The results show that : in the horizontal direction , in addition to total phosphorus, total potassium is a weak variability , the rest of the soil chemical properties are moderate variability , alkaline hydrolysis N, P spatial variability gt ; soluble salt gt ; variation of available K total nitrogen spatial variability of soil surface in total potassium and phosphorus ; fairly , available N , and available P level variability ; gradually decreases with the sampling depth increases nitrogen content in the vertical direction , while available phosphorus content with sampling depth increases sharply , soluble salt , available K did not exhibit significant vertical variation characteristic ; present weakening trend with the growth and development of the cotton , of soluble soil salinity, available nutrients and organic matter content spatial variability . Between soil chemical properties and correlation analysis between the cotton production : soil organic matter , alkaline hydrolysis nitrogen and cotton production was significantly positively related to the soluble salt , available K and cotton production was significantly negatively correlated , and the blooming period . correlation than before sowing significantly with ; boll stage alkaline hydrolysis nitrogen and fast-acting phosphorus achieve significant with a positive correlation with available K was significant with negative correlation , available phosphorus and available potassium was significantly negatively correlated ; before sowing and the blooming period available K and salt were highly significant positive correlation , alkaline hydrolysis nitrogen and soluble salt showed a significant negative correlation . In addition , with the help of geographic information systems and computer recommended fertilization system the the accurate soil nitrogen and phosphorus fertilizer recommendation simulation applied research . The results provide a scientific basis to improve the effectiveness of field trials , soil improvement and soil nutrient precision management with basic information .

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CLC: > Agricultural Sciences > Agriculture as the foundation of science > Soil > Soil Biology > Soil - plant system
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