Saturday, 15 July 2006

Residual Effects of Phosphorus and Soybean Crop on Maize in the Guinea Savanna.

Iheanyichukwu J. Ogoke, Federal Univ of Technology, PMB 1526, Imo state, Owerrri, Nigeria and Adeniyi O. Togun, University of Ibadan, UI Post Office, Oyo state, Ibadan, Nigeria.

Two seasons of cropping was carried out at three sites in the Guinea savanna to evaluate the residual effects of soybean on maize. The experiment was laid out as a split-plot in a randomized complete block with three replications. In the first season, four soybean varieties with a fallow treatment (control) received Phosphorus (P) applied as triple super phosphate (20%) at the rates of 0, 30 and 60 kg P/ha. Maize variety TZECOMP4C2 was grown in these plots in the second season. At all sites previous crop had no significant effect on total soil N and available P after the first season of cropping. Available P was however affected by previous year P rate at all sites. From initial values ranging from 5.2-16.2 mg/kg in the first season, available P significantly increased to between 13.6-42.8 mg/kg when 60 kg P/ha was applied compared to 7.7-18.6 mg/kg at no P application. Relative to no P application in the previous year, the application of 60 kg P/ha significantly increased total dry matter at 6 weeks after planting by 19%, total harvest dry matter by 28%, and grain yield by 37%.

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