Effect of adding a salinity regulator and enriching organic fertilizer with nano-compound fertilizer (NPK) on some chemical and physical properties of the soil

Abstract

The experiment was carried out in the fields of the College of Agriculture, University of Diyala, during the period of 2025-2026 agricultural season. The study aimed to examine the effect of the addition of the salinity regulator and enrichment of the organic fertilizer with the nano-NPK fertilizer on some properties of the soil. The experiment used the Randomized Complete Block Design (RCBD), a split-plot design with three replicates, which constituted a total number of 36 experimental units. Three levels of the salinity regulator were used in the main plots as follows: without addition, 10 mL L⁻¹ per seedling, and 20 mL L⁻¹ per seedling. Also, four levels of organic and nano-NPK fertilizer treatments were used in the sub-plots as follows: without addition, 5% sheep manure, 5% sheep manure + 5 kg ha⁻¹ nano-NPK fertilizer, and 5 kg ha⁻¹ nano-NPK fertilizer only. The data collected were statistically analyzed by comparing their means using Duncan's Multiple Range Test at a probability level of 0.05. It was found that the addition of 5% sheep manure (O2) was better than the control (O1) in relation to nitrogen, phosphorus, potassium, and organic matter contents of the soil; the mean values ​​of these parameters were