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Nitrogen Nutrition of Cowpea (Vigna unguiculata)*: II. Effects of Short-term Applications of Inorganic Nitrogen on Growth and Yield of Nodulated and Non-nodulated Plants

  • P. J. Dart (a1), P. A. Huxley (a1), A. R. J. Eaglesham (a1), F. R. Minchin (a1), R. J. Summerfield (a1) and J. M. Day (a1)...

Summary

Average seed yields of effectively nodulated cowpea plants were 38% greater than those of non-nodulated plants when both received applied nitrogen at concentrations ranging from 60 to 240 ppm during one of three periods: emergence to first flower, first flower to mid pod-fill, or mid pod-fill to maturity. Nodulation increased seed yields by 45% when plants received a ‘basal’ level of 30 ppm N throughout growth. None of the combined nitrogen treatments could compensate non-nodulated plants for the loss of symbiotic nitrogen fixation. Non-nodulated plants relying on applied N branched less, produced fewer peduncles and set fewer pods on each peduncle than nodulated plants.

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Nitrogen Nutrition of Cowpea (Vigna unguiculata)*: II. Effects of Short-term Applications of Inorganic Nitrogen on Growth and Yield of Nodulated and Non-nodulated Plants

  • P. J. Dart (a1), P. A. Huxley (a1), A. R. J. Eaglesham (a1), F. R. Minchin (a1), R. J. Summerfield (a1) and J. M. Day (a1)...

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