Affiliation:
1. College of Agriculture, University of Wasit, Wasit Province, Iraq
2. College of basic education, University of Misan, Misan province, Iraq
Abstract
A field experiment was carried out in one of the fields of Diwaniya
governorate for the agricultural season 2019 to study the effect of adding organic
fertilizer and sources of phosphate fertilizer during the growth stages of the maize
plant (Zea mays. L) and its reflectance on growth and productivity of the plant.
The experiment was conducted according to the design of the (split-split plots
and included two levels of the organic fertilizer(L1-L0) standing for (0- 1.5 tons)
and three sources of the following fertilizers: Tri super phosphate TSP, DiAmmonium phosphate DAP and Urea UP) as add to control treatment (p0) symbolized by p1, p2, p3, respectively. The seeds of maize (Zea mays. L) Behoth
5018s cultivar were planted in a 25 kg/H range. The kinetics of phosphorous in
the soil were studied. The phosphorus release rate was determined during the
stages of plant growth, and the best equation in describing the mechanism of desorption in the stages of plant growth (25, 50, 75, 100 and 125 days). The results
showed that all used equations (first-order, diffusion and Elovich) have described
the mechanism of phosphorous release from a solid phase to the soil solution. All
equations gave a highly significant correlation (r) between released phosphorous
in the stages of Plant growth. The first-order equation surpassed other equations
describing the mechanism of phosphorous release in the soil. The values of the
coefficient of phosphorous release rate (KP) ranged between (0.0045 - 0.004 mg.
p. kg-1
. Day-1
) for the equation of first- -order, where the results showed that the
linear relationship between the amount of released phosphorous as a function of
time for the equation of first-order, is the best equation in describing the release,
which indicates the interest in the amount and timing of addition of p fertilizers
during the stages of plant growth, according to what was shown in the kinetic
equations.
Keywords: Phosphorous desorption, fertilizers, maize, kinetic equations, soil solution.
Subject
Infectious Diseases,Applied Microbiology and Biotechnology,Epidemiology,Biotechnology
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