Archive > Volume 35 Issue 2 > 1998,35(2):155-161. DOI:10.11766/trxb199611020202 CSTR:[cstr] Prev Next
THEORETICAL CALCULATION OF K RELEASE RATES FROM SOILS AND THEIR APPLICATION
- Article
- Figures
- Metrics
- Preview PDF
- Reference
- Related
- Cited by
- Materials
Abstract:
Potassium release rate characteristics of twenty low-hilly red soils under electric field strength of 44.4 V/cm and 88.8 V/cm were described with a second-order kinetic equation. The rate equations of K release and the initial K release rates (v0) were calculated from the second-order equations. The values of vo ranged from 1.17 to 21.23 and from 1.93 to 61.58, with an average of 5.36 and 9.54 mg(kg·min)-1 at the electric field strength of 44.4 and 88.8 V/cm, respectively. The relative grain yield, relative total dry matter yield and K uptake in NP plots of 20 corn experiments and the available K, NHO3-soluble K and slowly available K of soils were used as reference standards to assess the practical applicability of v0.The correlation analysis showed that v0 was very significantly correlated(P=0.01) with the above six reference standards, with the correlation coefficients of 0.6275**, 0.5645**, 0.6624**, 0.7277**,0.7843** and 0.6299**,respectively, at electric field strength of 44.4V/cm. v0 was significantly correlated with relative total dry matter yield(P=0.05, r=0.5445**) and very significantly correlated with the other five reference standards, with the correlation coefficients of 0.6064**, 0.7216**, 0.7523**, 0.8202** and 0.6686**, respectively, at the field strength of 88.8V/cm. It was suggested that v0 could be used to estimate the supplying power of soil K and to characterize K status in soils.
Keywords:
Project Supported:
Clc Number:
