Chemical Properties of Soil under Different Redox Potentials

Abstract

Aim: The experiment was setup in an attempt to determine the effect of redox potentials on soil chemical properties Mat and met: A 3 x 2 x 2 factorial experiment was conducted. The experiment was laid out in Randomized Complete Block Design (RCBD) and consisted of three factors namely: Poultry manure at three levels (0 tha-1, 6 tha-1 and 8 tha-1), NPK 15-15-15 at two levels (0 kgha-1 and 200 kgha-1) and watering regimes at two levels (waterlogged and field capacity). These factors were used to induce the various redox status of the soil. The combination of these variables resulted in twelve (12) treatments which were replicated three times and repeated. The soils were incubated for about three months after which data were collected on soil chemical properties. Data collected included total N, available P, exchangeable cations and organic matter content. Data collected were subjected to analysis of variance (ANOVA) using SPSS version 17 and means compared using Tukey Honesty Significant Difference (HSD) test to verify significant differences among treatments at 5% probability level. Graphs were generated using Microsoft excel 2010 edition. Result: The results of this research showed that redox potential causes changes in the chemical properties of the soils. There was significant difference (p < 0.05) in the nitrogen content among the treatments and the highest was moderately reduced soils being 62.5% greater than the oxidized soil that recorded the lowest. There was also significant difference (p < 0.05) in the available P which was highest under oxidized soils, being 76.4% greater than the highly reduced soil that recorded the lowest. Organic matter content was highest under highly reduced soil being 42.9% greater than the oxidized soil that recorded the lowest. There were also significant differences (p<0.05) among the treatments in terms of exchangeable cations. Exchangeable cations were lowest in soil under highly reduced conditions. Conclusion: It was concluded that the redox status of a soil is a fundamental property that has the tendency of affecting other soil chemical properties.

Evaluating the Long-Term Effect of Integrated Nutrients of Pome, Cow Dung and NPK on Soil Chemical Properties under a Garden-Egg Field

“…The compound formed was then titrated with 0.02 NHCL. Available phosphorus was determined using the Bray and Kurtz (1945) method" [14].…”

“…The solution was titrated with 0.01 N EDTA (ethylene diamine tetraacetic acid) to a pure turquoise blue color and the titre values were recorded. The values for calcium were subtracted from this value to get the titre value for magnesium" [14].…”

“…The end product is a brownish red or maroon color solution. Also a blank titration was done without soil" [14].…”