Qahtan D. Essa Al-Khafagi

Phosphorus-zinc Interactions in the Soil Environment and their Effects on the Sustainability of Agricultural Soils

Rana Saadallah Aziz, Qahtan D. Essa Al-Khafagi & Fatih Abid Hassan · International Journal of Plant & Soil Science · 2026

Phosphorus (P) and zinc (Zn) are essential nutrients required for plant growth and productivity. Phosphorus plays a pivotal role in energy transfer (ATP), nucleic acid synthesis, root development, and grain formation, while zinc is involved in enzyme activation, hormone synthesis...

Open access Research Article 10.9734/ijpss/2026/v38i15953

The Role of Biochar in the Behavior of Positive Ions and Dispersion Parameters in Two Soils of Different Textures

Assala S. A. Al-Hamdani & Qahtan D. Essa Al-Khafagi · Asian Journal of Soil Science and Plant Nutrition · 2025

The study included the selection of two sites for two different textured soils within Nineveh Governorate - Iraq, with the aim of knowing the role of biochar in the chemical behavior of positive ions (Ca+2, Mg+2, Na+, K+) as well as dispersion parameters (SAR, MCAR, CROSS). Soil...

Open access Research Article 10.9734/ajsspn/2025/v11i2537

Effect of Different Temperatures on Reactions of Potassium Adsorption and Availability in Saline Soils within Nineveh Governorate, Iraq

Haneen H. A. Al-Jubory & Qahtan D. Essa Al-Khafagi · Asian Journal of Soil Science and Plant Nutrition · 2024

Thermodynamic criteria were used to evaluate the adsorption and release of potassium in saline soils. The study was conducted on three sites that differ in salt content in Nineveh Governorate - Iraq, and each site is divided into two depths (surface and subsurface). The study was...

Open access Research Article 10.9734/ajsspn/2024/v10i4432