Response of Field Pea (plsum sativum L.) Cultivars to Phosphorus Fertilization on Nitisols: I. Glasshouse.
2007
Amare Ghizaw and Du Preez,C.C. and Taye Bekele
The responses of Ethiopian field pea cultivars to phosphorus fertilization of Nitisols enriched with phosphorus were investigated in glasshouse. For this purpose two experiments were laid out in a split-plot design using topsoil from Ilala and Cheffa, with low, medium and higs phosphorus fertility levels as the main plot treatments. Factorial combinations of field pea cultivars (Holetta,G22763-2C,Tegegnech and Cheffa local) and six phosphorus application rates (0, 7.5,15, 30, 60 and 120 mg P kg-') in 3 kg soil were used as the sub-plot treatments in a randomized complete block design with four replications. The phosphorus fertility levels and application rates had positive influences on the growth and development of field pea as manifested in the biomass yield of different cultivars. The position, size and colour of the nodules were affected by the phosphorus fertility levels of both soils. However, phosphorus application rates had significant effects on the size and colour of the nodules from Cheffa soil. All cultivars showed excellent nodulation regardless of phosphorus levels and application rates. The critical phosphorus levels by Bray 2 method are around 15 mg kg-' for Ilala and 19 mg kg-1 for Cheffa soils. In the case of Olsen extractions these values were 22 mg kg-1 for Ilala and 21 mg kg-1 for Cheffa soil.
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