Publisher: Bachudo Science Co. Ltd

Changes In Soil Ph and Maize Contents of Zinc and Phosphorus Under Zinc Sulphate and Organic Waste Applications

E. A . Akinrinde, O. S. Bello, O. A. Ollibakin, A. A. Ahmed
KEYWORDS: Organic wastes. Zinc sulphate, Oxic Paleustalf and Typic Paleudalf soil types, Soil-P-Zn-pH changes.


Zinc (Zn) fertilizer application is common in field crop pro.duction in many areas of the world. This study evaluated effects of zinc sulphate, ZnS04 (22.8 % Zn), a commercial organic fertilizer (O.F) produced from market wastes (0.02 % Zn, 0.36 % Ca, 2.30 % N, 0.55 % P, 0.47 % K) and organo-,mineral combination (O.F + ZnSQ4) on P and Zn nutrition of maize (Zea mays, L. var. TZEEY-SR EC5). Plants were grown in pots using a medium acid (pH 5.9) sandy clay Oxic Paleustalf from Zaria (Southern Guinea Savannah zone) and a weakly acid (pH 6.6) sandy Typic Paleudalf from Epe (Rainforest zone). Fertilizer materials (each applied at O. 20 and 40 mg Zn kg-1 soil) were replicated three times in completely randomised design for the soils. Crop leaf area, shoot weight, P and Zn concentration and uptake by the crop were determined after 28 days of growth. Triplicates of 400 g treated soil samples were also incubated and soil pH, 0.1N HCI extractable-Zn as well as Bray-1 P determined after 7 a.nd 28 days. Soil type, Zn source and application rate influences were similar on plant leaf area and biomass production. Plants had significantly (P < 0.05) mortl shoot yield on slightly acid Typic Paleudalf than on medium acid Oxic Paleustalf while O.F and O.F + ZnS04 applications resulted in similar yields that were higher than was produced with sole ZnSQ4. Soil type and fertilizer treatments had no appreciable effect on Zn content in maize tissue while only fertilizer sources failed to tangibly influence Zn-uptake but both had pronounced effects on Pr trition. Uptake of Zn and P by plants fertilized with 20 and 40 mg Zn kg· 1 were essentially similar but notably higher than for thtreated ones. After incubation for 7 days, both, soil types had negligible increases in pH and extractable Zn but slight reductions in availabte,P. However, by the 281 h day, pH ,decreased while Zn and P availability increased. Application of Zl"S04- fortified organic fertilizer produced from market waste proved to be a good antidote for Zn deficiency and / or toxicity in crop plants

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