Spatial Variability Of The Main Fertility Fcators In Hilly Tea Plantation Soils With Different Sampling Scales

In this research, the author analyzed the special variabilities of the main fertility factors in tea plantation soil with two sampling scales by Geostatistics. The aim of the research was to provide the basis of the experimental data for the construction of organic-ecology tea plantation, and for the Precision agriculture tea plantation management. According to the Statistics, semivariogram and Kriging methods, the results indicated as:1. In small scale: The average values of total nitrogen(TN), total phoshorus(TP), toal potassium(TK), Alkali-hydrolyzable nitrogen(AN), available phoshorus(AP), available potassium(AK) were 1.16g/kg, 0.65g/kg, 13.59g/kg, 71.74mg/kg, 9.53mg/kg and 53.24mg/kg. The soil fertility of the tea plantation was at medium level. The average value of pH in soil was 4.08, This numerical value was below the standard of the soil in high quality tea plantation. It showed that the soil in this tea plantation became more and more acidic. The average values of the organic matter(OM) and the soil cation exchange capacity(CEC) were 27.22g/kg and 10.17cmol/kg. This result indicated that the tea plantation soil has medium capacity to keep fertility. The average value of the available silicon was 42.33mg/kg, which was at low level. The average content of the sand was the most one among the soil particle composition. Its average contenet was 35.3%. The second was Med. and fine silt, its average content was 24.14 %. The third was Coar. Silt, the forth was clay. The average value of the Bulk density was 1.19g/cm~3, So the soil was porous, The soil physical properties was good.In micro scale: The average values of TN, TP, TK, AN, AP, AK were 1.47g/kg, 0.59g/kg, 12.95g/kg, 86.99mg/kg, 15.70mg/kg and 49.13mg/kg. The average value of pH in soil was 4.03, This value also showed that the soil in this tea plantation became more and more acidic. The average values of the OM and the CEC were 34.91g/kg and 12.61cmol/kg. This result indicated that the tea plantation soil has medium capacity to keep fertility. The average value of the available silicon was 59.79mg/kg, which was at low level. The average content of the Med. and fine silt was the most one among the soil particle composition. Its average contenet was 29.37%. The second was sand, its average...