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本试验测定了广东省花岗岩地区、玄武岩地区和珠江三角洲冲积物地区水稻土的钾位pK-(1/2)p(Ca+Mg)、平衡活度比AR_o~K,速效钾含量-△K~o和钾位缓冲容量PBC~K,以这些热力学参数与第1季及连续4季盆栽水稻谷粒产量和植株吸钾量参比项作相关分析,结果表明:(1)花岗岩地区水稻土pK-(1/2)p(Ca+Mg)最小,AR_o~K和-△K~o最大,玄武岩地区水稻土则相反,冲积物地区水稻土PBC~K最大。(2)pK-(1/2)p(Ca+Mg)和-△K~o适宜用于花岗岩地区水稻土当季的需钾诊断,AR_o~K对于三类水稻土都不适宜,PBC~K对于三类水稻土都适宜且能用于连续4季的需钾诊断。(3)~aCa+~aMg基本上是常数。(4)花岗岩地区水稻土pK-(1/2)p(Ca+Mg)、-RTlna_K和-△K~o对盆栽水稻临界值分别约为2.84,5400卡/克分子和0.08毫克当量/100克土,PBC~K对于全部水稻土盆栽水稻的临界值约为46[(毫克当量/100克土)]/[(克分子/升)~(1/2)]。
In this study, we determined the pK- (1/2) p (Ca + Mg), the equilibrium activity ratio (AR_o ~ K), the available potassium content in the paddy soils of granite area, basalt area and alluvial area of Pearl River Delta in Guangdong Province - △ K ~ o, and potassium buffer capacity PBC ~ K. The correlation analysis between these thermodynamic parameters and the reference values of grain yield and potassium uptake of potted rice in the first and fourth seasons showed that: (1) pK- (1/2) p (Ca + Mg) is the smallest, while AR_o ~ K and - △ K ~ o are the largest. In the basaltic paddy soil, the PBC ~ K is the largest in the alluvial paddy soil. (2) pK- (1/2) p (Ca + Mg) and -ΔK ~ o are suitable for the diagnosis of potassium needed in the paddy soils of granite area. AR_o ~ K is not suitable for the three types of paddy soils, K is suitable for all three types of paddy soils and can be used for potassium diagnoses in 4 consecutive quarters. (3) ~ aCa + ~ aMg is basically a constant. (4) The critical values of pK- (1/2) p (Ca + Mg), - RTlna_K and - △ K ~ o for paddy rice in the granite area were about 2.84, 5400 cal / mol and 0.08 mg / The threshold for PBC-K for all paddy-potted rice is about 46 [(meq / 100 g soil)] / [(mol / L) ~ (1/2)].