1. Soil nutrients spatial variability and soil fertility suitability in Qujing tobacco-planting area.
- Author
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LI Qiang, ZHOU Ji-heng, YANG Rong-sheng, ZHANG Zheng-yan, XIE Yan, ZHANG Yi-yang, HUANG Kua-ke, and LI Wei
- Abstract
By adopting GPS technique, 2088 sampling sites were installed in the tobacco鄄planting area of Qujing City, Yunnan Province, with 0-20 cm soil samples collected to determine their main nutrients contents. The overall characteristics and spatial variability of the tobacco soil nutrients were analyzed by classic statistics and geo鄄statistics, and the soil fertility suitability in planting tobacco was evaluated by the methods of fuzzy mathematics. In the study area, soil pH and soil organic matter, available S, and water鄄soluble Cl contents were appropriate, soil total N and alkalihydrolyzable N contents were too high, soil available K, Ca, Mg, Cu, Fe, Zn, Mo, and Mn contents were abundant, soil available P content was at medium level, while soil total P and K and available B contents were insufficient. All the nutrient indices presented anisotropic distribution, among which, the spatial variability of soil available P and B was mainly caused by random factors, and that of other nutrients was caused by the co鄄effects of structural and random factors. The spatial distribution map of soil fertility suitability index (SFI) showed that there was no the excellent grade region for tobacco鄄planting, good grade region accounted for 8郾0%, general grade region accounted for 51郾6%, moderate grade region accounted for 39郾0%, and low grade region accounted for 1郾4%. [ABSTRACT FROM AUTHOR]
- Published
- 2011