Sky Journal of Agricultural Research Vol. 5(3), pp. 048-055, May, 2016. Available online http://www.skyjournals.org/SJAR
ISSN 2315-8751 ©2016 Sky Journals

 

Full length Research Paper

Long term effects of lime and phosphorus application on maize productivity in an acid soil of Uasin Gishu County, Kenya

 

Kisinyo Peter Oloo
 

School of Agriculture, Natural Resources and Environmental Studies, Rongo University College, P. O. Box 103-40404, Rongo, Kenya. E-mail: kisinyopeter@yahoo.com/dean-agriculture@ruc.ac.ke.  Tel.: +254723320168.

 

Accepted 21 March, 2016

 

 

Abstract

The study determined the individual and combined effects of lime and phosphorus (P) application on maize productivity and economic benefits on an acid soil of Uasin Gishu County, Kenya. Treatments were P fertilizer (0, 26 and 52 kg P/ha) and lime (0 and 6 tons/ha), all were applied once. All treatments, except control, received 75 kg N/ha. The soil was low in base cations, total N and available P but was high in exchangeable Al3+. Application of lime maintained soil pH above 5.5 for about four years only. The mean grain yield increment due to 26 kg P, 52 kg P and 6 tons lime/ha were 35, 61 and 29% respectively. In the second, third and fourth years, 75 kg N+52 kg P/ha produced economically viable returns with net financial benefits of (NFBs) of USD 942, 1802 and 2540, respectively. Application of 52 kg P/ha together with 75 kg N and 6 tons of lime/ha produced economically viable returns with NFB of USD 2732 during the fourth year. Therefore, farmers can obtain long term economically viable maize grain yield with application of lime and P fertilizer on low P acid soil of the region.


Key words: Soil acidity, lime, phosphorus, maize yield, economic benefits. 
 

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