Hostname: page-component-797576ffbb-pxgks Total loading time: 0 Render date: 2023-12-09T02:03:51.676Z Has data issue: false Feature Flags: { "corePageComponentGetUserInfoFromSharedSession": true, "coreDisableEcommerce": false, "useRatesEcommerce": true } hasContentIssue false

Effects of Nitrogen, Phosphorus and Potassium on Nodulation in Cowpea

Published online by Cambridge University Press:  03 October 2008

G. P. Tewari
Faculty of Agriculture, University of Nigeria, Nsukka, E. Nigeria


A factorial (3 × 3 × 3) experiment using three levels of nitrogen, phosphate and potassium was conducted to evaluate the effects of these elements on the formation of nodules. Results indicated that increasing levels of nitrogen depressed the formation of both effective and ineffective nodules, but phosphorus and potash did not produce any significant effects. Although the soils of the experimental plots were highly leached and strongly acid in nature, the native strains of rhizobia were able to produce copious amounts of effective nodules on plants growing on plots where no nitrogen was applied. It appeared that the naturally occurring rhizobia strains in these soils are well adapted to their natural environments.

Research Article
Copyright © Cambridge University Press 1965

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)



Albrecht, W. A. (1937). Soil Sci. Soc. Amer. Proc. 2, 315.Google Scholar
Albrecht, W. A. & McCalla, T. M. (1936). Soil Sci. Soc. Amer. Proc. 1, 217.Google Scholar
Allen, O. N. (1962). The Inoculation of Legume Forages. Iowa State University Press.Google Scholar
Allen, O. N. & Baldwin, I. L. (1954). Soil Sci. 78, 415.Google Scholar
Giobel, G. (1926). New Jersey Agr. Expt. Sta. Bull. 436.Google Scholar
Norris, D. O. (1958) Nutrition of Legumes (Ed. Hallworth, ). London, Butterworths Sci. Publ.Google Scholar
Russell, E. W. (1961). Soil Conditions and Plant Growth. London, Longmans Green.Google Scholar
Tewari, G. P. (1963). Emp. J. Expt. Agric. 31, 50.Google Scholar