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American Journal of Experimental Agriculture, ISSN: 2231-0606,Vol.: 9, Issue.: 3


Micro-Dosing of Inorganic Inputs on Maize Production on an Acid Soil in Kenya: An Agronomic and Economic Evaluation


P. O. Kisinyo1*, P. A. Opala2, S. O. Gudu1 and C. O. Othieno3

1Department of Agronomy and Environmental Science, Rongo University College, P.O.Box 103-40404, Rongo, Kenya.

2Department of Soil Science, Maseno University, P.O.Box, Private Bag, Maseno, Kenya.

3Department of Soil Science, University of Eldoret, P.O.Box 1125-30100, Eldoret, Kenya.

Article Information
(1) Moreira Martine Ramon Felipe, Departamento de Enxeñaría Química, Universidade de Santiago de Compostela, Spain.
(1) Anonymous, Bangladesh.
(2) Msr Krishna, Agricultural Biotechnology, KL University, India.
Complete Peer review History: http://sciencedomain.org/review-history/10382


Aims: The study determined the effect of micro-dosing of lime, P and N fertilizers on maize grain yield and economic benefits.

Study Design: The experiment was a 2 x 2 x 3 split-split plot laid out in randomized complete block design with N (0 and 37.5 kg N ha-1) in the main plot, P (0 and 13 kg P ha-1) in the sub-plot and lime (0, 0.77 and 1.55 tons lime ha-1) in sub-sub plot. 37.5 kg N and 13 kg P ha-1 are 50% of the recommended fertilizer rates for maize production in Kenya while 0.77 and 1.55 tons lime ha-1 are 25 and 50% of the actual requirement.

Place and Duration of Study: The study was carried on nutrient deficient acid soil on a small holder farmer (SHF) field in Busia County, Kenya during the years 2008 and 2009.

Methodology: Lime was applied once during the long rain in the year 2008 while P and N fertilizers each cropping season.

Results: Grain yield increased by 148 and 40% due to 50% of both the recommended N and P fertilizers, respectively and 5-17% due to 25-50% of the lime requirement. Majority (57-75%) of the production costs were due to inorganic inputs. Only combined application of 50% of both the recommended N and P fertilizers produced economically viable returns throughout the cropping period. Combination of 50 and 25% of the recommended P and lime, respectively and 50 and 25% of the recommended N and lime, respectively produced economically viable returns only during the second and third cropping seasons. A combination of 50% of both the recommended P and lime produced economically viable returns during the third cropping season only.

Conclusion: Small holder farmers producing crops on Kenya’s acid soils deficient in N and P such as in Busia County can realize economically viable returns by micro-dosing of N, P fertilizers and lime.

Keywords :

Micro-dosing; nitrogen; phosphorus; acid soil; lime; benefits.

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DOI : 10.9734/AJEA/2015/17984

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