Direct and interactive effect of boron and nitrogen on selected agronomic parameters and nutrient uptake by cowpea (Vigna unguiculata (L.) Walp.) under glasshouse conditions
1991
Agbenin, J.O. | Lombin, G. | Owonubi, J.J. (Ahmadu Bello University. Zaria (Nigeria). Department of Soil Science)
The effect of N and B applications on plant growth and tissue B concentration in cowpea in relation to dry matter yield was investigated in the glasshouse using three (3) representative savanna soils: an Alfisol, Ultisol and Inceptisol. Treatment applications consisted of factorial combinations of four levels of N and three levels of B in a randomized complete block design. The above ground portions of the plants were cut 35 days after planting, dried, weighed, milled and analyzed for boron. Applied N significantly increased growth components, dry matter yield and nutrient uptake over the control. Applied B decreased growth and dry matter yield in all but one soil and increased B. concentration in plant tissue. A critical level of B toxicity in the plant tissue was approximated to be 30 ppm. There was no significant N and B interaction effect on the parameters assessed in the trial.
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