Publisher: Bachudo Science Co. Ltd

Effect of NPK Fertilizer and Interval Management On The Chemical Properities of Coastal Plain Sands of Akpabuyo, Nigeria

W. Ubi, A. U. Akpanidiok, M. W. Ubi
KEYWORDS: Chemical Properties, NPK Fertilization, Management Intervals, Coastal Plain Sands.

ABSTRACT:

Investigation of the chemical properties of the coastal plain soils treated with NPK 20:10:10 fertilizer (NPK) at the rate of 0,60, 90 and 120kg ha-1 and observed at intervals of 3,6,9 and 12 months was carried out from March 2009 to 2010 at Akpabuyo, Cross River State, Nigeria. The experiment comprises of four fertilizer rates and four management intervals fitted into a Latin square design. The soils pH value increased consistently from 3 to 12months. Mean values of organic matter decreased with increase in profile depth from 2.12-1.34g kg-1. The distribution of N from the top soil down the profile increased consistently from 3 to 12 months. The mean value of N from the top soil was 0.82%. Exceeding 0.2%, the critical value and was more than the mean values obtained in the sub-surface soil. The mean value of P (33 mgkg-1) during the 9 months interval was significantly (P<0.05) higher than all other sampling periods. There was vertical and horizontal loading of P which lead to higher available P at the surface in soil depths of 0-15 and 15-30cm than 30-40cm and 40- 50cm. Levels of Ca increased slightly with sampling interval but decreased down the profile. The soils were also characterized as follows: strongly acid (pH 5.1 – 5.3), exchangeable Mg. (> 0.5 cmol kg-1), low contents of K and Na as well as high exchangeable Al. levels (> 4.0 cmol kg-1) and cation exchange capacity (22 – 36 cmol kg-1) The application of 90 kg/ha-1 NPK%



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