Abstract
A laboratory experiment has been carried out in the College of Science-University of Salahaddin to study the effect of different levels (0,5,10 and 15%) and sizes(250 and 1000µm) of walnut seeds residues and (160mg.kg-1) phosphorus fertilization on the concentration of phosphorus availability and alkaline phosphatase activity in calcareous soil during 15 and 30 days period of incubation, the experimental design in factorial complet randomize design (C.R.D) with three replications. The results indicated that the application of different levels of walnut seed residues decreases the concentration of phosphorus availability and alkaline phosphatase activity, however the results revealed that combination between levels and sizes of sieved walnut seed residues and phosphorus fertilizer significantly (p≤0.05) affected the alkaline phosphatase activity and the concentration of available phosphorus, the highest values (29.633 µgPNPg-1.hr-1and 6.442mg.kg-1) have been recorded in treatments combination received 1000µm, 15% walnut seed residues and phosphorus fertilizer, respectively.
Highlights
The soil is a living dynamic system containing many free enzymes, immobilized extracellular enzymes within enzymes inside the microbial cells
The results indicated that the application of different levels of walnut seed residues decreases the concentration of phosphorus availability and alkaline phosphatase activity, the results revealed that combination between levels and sizes of sieved walnut seed residues and phosphorus fertilizer significantly (p≤0.05) affected the alkaline phosphatase activity and the concentration of available phosphorus, the highest values (29.633 μgPNPg-1.hr-1and 6.442mg.kg-1) have been recorded in treatments combination received 1000μm, 15% walnut seed residues and phosphorus fertilizer, respectively
Materials and Methods: A laboratory experiment has been carried out in the College of Science-University of Salahaddin to study the effect of different levels and sizes of walnut seeds residues and phosphorus fertilization on the concentration of phosphorous availability and alkaline phosphatase activity in calcareous soil, the experimental design in factorial complet randomize design (CRD) (Complete Randomise Desigen) with three replications
Summary
The soil is a living dynamic system containing many free enzymes, immobilized extracellular enzymes within enzymes inside the microbial cells. Enzymes are viewed to be an important soil components, their activities in soil have the potential to provide unique biological information of soils; along these lines, they are alluring as one proportion of soil health 2. Phosphatase is an enzyme of great agronomic value because it hydrolyses compounds of organic phosphorus and transforms them into different forms of inorganic phosphorus, which is assimilating by plants 3. Plant residues application is an important way to maintain soil productivity. The walnut (Juglans regia L.) is the most trees widespread around the world, in the Kurdistan region. Walnut is nutrient-dunce food mainly owning to the fact that it is fat contetnt as well as protein, vitamin and mineral profiles, estimated that 70% of the fruit weight is husk and shell 4
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