Evaluation of potentially available soil nitrogen by using buffer phosphate solution of pH 7
1986
Ahn, S.B. (Rural Development Administration, Suwon (Korea R.). Agricultural Science Inst.)
Laboratory experiments were conducted to estimate extracted nitrogen by buffer phosphate solution of pH 7. A series of experiment soils were a) Sandy soil applied with compost, lime, and Wallastonite every years for 32 years. b) Sandy soils with and without waterlogging for 70 days before transplanting. c) Normal soils produced high and common yields. Extractable organic nitrogen by pH 7 phosphate buffer solution was increased in order of NPK + compost NPK NPK + compost + lime + Wollast-onite NPK + compost + lime NPK + wollastonite no fertilizer plot
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