Abstract

Soil test based phosphorous calibration study was conducted fababean on
Nitisols of farmers’ fields in West Shewa, in central highlands of Ethiopia.
The experiment was arranged in a complete block design with six levels of
phosphorous fertilizer (0, 5, 10, 15, 20 and 25 kg ha^-1) with three
replications. Results showed that grain yield of fababean were significantly
affected by P fertilizer application rate. The application of phosphorous
fertilizer at different rates increased grain yield, up to 58% more than the
control. Extractable soil P concentrations (Bray II, 0- 20 cm depth) three
weeks after planting significantly responded to P fertilizer rate. Correlations
of relative yield with Bray-2 soil test phosphorous values showed that the soil
test phosphorous levels greater than 12.5 mg kg^-1 (critical
phosphorous concentration) was found to be sufficient for fababean production.
The average phosphorous requirement factor (Pf)^{calculated from soil
test phosphorous values of all treatments for the study area was 7.02}

Keywords: Critical P
concentration, Fababean, Nitisol, Phosphorous calibration, P requirement
factor, Relative yield

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