Kirkuk University Journal for Agricultural Sciences (KUJAS)

Effect of Magnesium Application on determination of phosphate fertilizer Requirements for wheat crop in soils with different Content of gypsum/ Effect of addition of magnesium on phosphorus adsorption

https://doi.org/10.58928/ku21.12112
Volume 12, Issue 1
Winter 2021
Page 127-139
Kirkuk University Journal for Agricultural Sciences (KUJAS)

Document Type : Research Paper

Authors

Abdul-Majeed AL-Maeni
Heba Mohameed AL-Hamdany

Dep. of field crops, College of Agriculture,Tikrit University, Tikrit, Iraq

Abstract
Three samples with different content of gypsum 5% , 15% and 25% was collected , to study the effect of magnesium addition on phosphate adsorption isotherm and to determination phosphate fertilizers requirements at different phosphorus concentration in soil solution .The soils was incubated with different levels of magnesium ( 0 , 30 , 60 ) mg Mg.kg-1 soil for one week . The phosphate adsorption was studied for each soil at the different levels of magnesium by addition different P-concentration ( 0 , 2 , 4,6,8,10,15,20,30,40,50 and 60 )μgP.ml-1 . adsorption isortherm equation was used to describe phosphate adsorption at the levels of magnesium added . The result showed that Langmuir III equation was the superior in description of phosphorus adsorption , the Freundlich equation was the second and finally Langmuir I . The Maximum adsorption ( Xmt) was decreased from 540.00 to 469.66 μgp.g-1 soil at 5% and 25% respectively at magnesium level Mg0 . Results indicated that the most of maximum adsorption more than 75% of the total adsorption ( Xmt ) was at Xm2 and Xm3 with low bonding energy addition of magnesium at Mg1 and Mg2 levels decreased the value of Maximum adsorption ( Xmt ) about 19.16 % in studied soils compared with magnesium level ( Mg0 ) phosphate fertilizer requirements at magnesium levels Mg1 and Mg2 and at suggested phosphorus concentrations decreased the fertilizers requirements from 50 to 200 kgTSP.ha-1compared with Mg0 level at soil with 5% and 15% gypsum respectively .

Keywords

Magnesium
phosphor adsorption
Gypsiferous soil
Subjects

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