Effect of Zeolite, Poultry Manure and Mineral Fertilizers in Availability of NPK in Calcareous Soil

Abstract

This experiment was conducted in one of fields belong to College of Agricultural Engineering Sciences / University of Baghdad–Station Research (F) in Jadriya. To find out effect of natural zeolite, organic fertilizer (poultry manure) and mineral fertilizers and their interactions on some soil characteristics in “Dounia” cabbage, a field experiment was carried out in fall season 2021. Treatments were replicated three times at factorial design in a RCBD. Factors of study experiment included addition of three levels of natural zeolite (without addition (Z0), 5 μg.ha-1 (Z5), and 10 μg.ha-1 (Z10), while poultry manure was added with three levels; without addition (O0), 5 μg.ha-1 (O5), and 10 μg.ha-1 (O10), As for mineral fertilizer treatments, they were added in three levels (50%, 75%, and 100% of complete fertilizer recommendation), which were 100 kg H-1 N, 150 kg H-1 P, and 150 kg H-1 K, which are denoted by symbols M50, M75, and M100, respectively. The experimental results showed that natural zeolite at 10 μg.ha-1 (Z10) significantly increased in in N, P, and K in soil after plant harvesting crop, which amounted to 42.72 mg N kg-1 soil, 20.23 mg P kg-1 soil, and 201.05 mg K kg-1 soil, respectively. Results also shows that poultry manure at 10 μg.ha-1 (O10) superiority of control treatment and gave highest N, P, and K in soil after plant harvesting, which amounted to 44.77 mg N kg-1 soil, 21.66 mg P kg-1 soil, and 207.38 mg K kg-1 soil, respectively. As for addition of mineral fertilizers, addition at 100% of complete fertilizer recommendation (M100) superiority of M50 and gave highest N, P, and K in soil after plant harvesting, which amounted to 38.96 mg N kg-1 soil, 18.88 mg P kg-1 soil, and 191.57 mg K kg-1 soil, respectively. Twice and triple interactions between the study factors significantly affected in availability of nitrogen, phosphor and potassium.