Effect of Fertigation-Applied Sulfuric Acid on Phosphorus Availability and Some Microelements for Greenhouse Cucumber
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Plant production Department, Khabat Technical Institute, Erbil Polytechnic University, Erbil, Iraq
Hemn Othman Salih   

Plant Production, Erbil Polytechnic University, 44100, Erbil, Iraq
Submission date: 2020-08-17
Final revision date: 2021-02-08
Acceptance date: 2021-02-11
Online publication date: 2021-08-16
Aim of study: Essential nutrient elements such as P, Fe, Zn, Cu, B and Mn are mostly affected by soil pH. In calcareous soils, it is often difficult to obtain a pH of 6-6.5 the optimum soil pH value of phosphorus and micronutrients, as the goal of fertilizer best management practices is to match nutrient supply with crop requirements to optimize yield while minimizing nutrient losses to the environment. Material and methods: In order to study the addition of different amounts of sulfuric acid through irrigation to minimize soil pH value, and to improve the availability of the elements on cucumbers, experiments were carried out on two types of soil textures: Silty Clay Loam (S1) and Silty Clay (S2). The sulfuric acid was applied with different concentrations (0, 0.5, 1, 3, and 5 ml L-1). The elements’ concentration was studied at three soil depths (D1 = 0-10, D2 = 10-20 and D3 = 20-30) cm. Results: The availability of P and micronutrients primarily increased in C4D3 in S2 soil. The P in this work was a positive correlation with Zn in both soils, while it showed a negative correlation with other micronutrients (Fe, Cu, B and Mn). Element concentration in plant tissue was studied in the plant residues after harvesting. The C3 was highly effective in increasing the elements (P, Fe, Zn, Cu, B, and Mn) in plant tissues in both soils, and had a significant effect on the increase in cucumber yield. Conclusion: The values of soil pH were regularly decreased by increasing sulfuric acid. Then, the availability of the studied elements was enhanced.