Abstract
The objective of this study was to determine the potassium (K) release kinetics of sandy soil sample representative soil of Egyptian new reclaimed areas as affected by treatments of different rates of compost and chemical fertilizers applied individually or mixture of both type sand the effect of two irrigation regimes i.e. 80 and 60% of water requirements IR. Four mathematical models (power function, Elovich, parabolic diffusion and first-order) were used to fitted the data describe K desorption reactions involving 168-hr cumulative reaction time. Comparison of the models using the coefficient of determination (r<sup>2</sup>) and the standard error of the estimate (SE) indicated that the Elovich and the power function equations overall displayed the best fitted ones. The first-order rate and for less extent, parabolic diffusion equation were less fitted to describe the kinetic data. The constants of the best fitted models represent the rate of K release indicated that all treatments applied to soil gave high and significant increase in rate of K release compared to the control (untreated soil). According to the same constants values, the organic fertilizer applied was the lowest one, meanwhile the chemical one was the highest values, the mixture treatments values, however, were in between the chemical and organic treatments. In addition, the 80% of IR gave the best water management in having both high K adsorption from used soil and significant K uptake by corn plant.
Highlights
Potassium is an element essential for plant growth and its importance in agriculture is well recognized [1]
The main aim of this study is to evaluate of short period the modified set up (ESFU) to apply generally in different kinetic studies and in studying the kinetics of potassium adsorption from new Egyptian reclaimed soil treated with both compost and chemical fertilizers
Since the water requirement IR applied to corn is an important factor in K bioavailability in soil system, in this work we evaluated two irrigation moisture regimes represent 80% and 60% of total water requirement on K desorbed from the used soil and subsequently the K bioavailability by corn
Summary
Potassium is an element essential for plant growth and its importance in agriculture is well recognized [1]. The distribution of K+ forms differs from soil to soil as a function of the dominant soil minerals present, total soil K+ reserves are generally large. Soil K+ is typically divided into four forms: soil solution K+, exchangeable K+, nonexchangeable K+, and K+ in soil minerals. Kinetics of chemical reactions in soil and aquatic environments is a topic that is of extreme importance. Most of chemical processes that occur in these systems are dynamic, and knowledge of the mechanisms and kinetics of these reactions is fundamental. To properly understand the fate of applied fertilizers, pesticides, and organic pollutants in soils with time, and to improve nutrient availability and the quality of our groundwater, it must study kinetics
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