Comparative analysis of humic acid, fulvic acid, and Eco-WRP combined with nano-NPK on SOC dynamics and NPK availability in potato soils
1 Department of Soil and Water Techniques, Al-Musayyab Technical College, Al-Furat Al-Awsat Technical University, Iraq. 2Department of Biocontrol Techniques, Al-Musayyab Technical College, Al-Furat Al-Awsat Technical University, Iraq. 3Department of Plant Protection, College of Agriculture, University of Karbala, Iraq. 4Department of Soil and Water Techniques, Al-Musayyab Technical College, Al-Furat Al-Awsat Technical University, Iraq. Corresponding e-mail: mohammed.rahim@atu.edu.iq
DOI: https://doi.org/10.37855/jah.2026.v28i01.39
Full text PDF The study was a field experiment based on a Randomized Complete Block Design (RCBD) with three replications in the autumn growing season of 2023-2024 in loam soil in the Al-Musayyib district, Babylon Governorate, in Iraq. At the test site, the baseline of soil organic carbon (SOC) was 2.72 g kg-1, and, after the harvest, SOC in the control plots dropped to 1.50 g kg-1. The experiment examined the synergistic interactions between humic acid, fulvic acid and Eco-WRP with nano-NPK on post-harvest soil organic carbon and availability of macronutrients in soils under potato cultivation. The treatments were (i) HA (5 g plant-1), FA (2 g plant-1) and control and (ii) Eco-WRP + nano-NPK at five levels: Eco-WRP only (10 kg ha-1), Eco-WRP + nano-NPK (2 g), Eco-WRP + nano-NPK (4 g), nano-NPK only (2 g) and control. Findings indicated that HA in combination with nano-NPK had a significant effect of enhancing the availability of nitrogen in the soil (73.152 mg kg-1). However, a mixture of FA, Eco-WRP (10 kg ha?¹) and 4 g nano-NPK led to maximum increases in available phosphorus (31.001 mg kg-1), potassium (318.632mg kg-1) and SOC (3.061g kg-1). The results illustrate the possibility of combined organic and nano-fertilizer management to boost soil fertility and nutrient bioavailability in semi-arid soils.
