Nitrogen efficiency at three sites in Nigeria as affected by N source and management

Authors

  • S.K. Mughogbo International Fertilizer Development Center (IFDC), P. 0. Box 2040, Muscle Shoals, Alabama 35662, USA
  • C.B. Christianson International Fertilizer Development Center (IFDC), P. 0. Box 2040, Muscle Shoals, Alabama 35662, USA
  • J.M. Stumpe International Fertilizer Development Center (IFDC), P. 0. Box 2040, Muscle Shoals, Alabama 35662, USA
  • P.L.G. Vlek International Fertilizer Development Center (IFDC), P. 0. Box 2040, Muscle Shoals, Alabama 35662, USA

Keywords:

Maize, 15N, Urea, Calcium ammonium nitrate, CAN, Cowpea

Abstract

Nitrogen trials were conducted using 15N-labeled urea and calcium ammonium nitrate in the production of maize (Zea mays L.) at three sites of contrasting agroecology in Nigeria. Split applications of banded, broadcast or point-placed N fertilizer had no consistent effect on grain yield or 15N uptake; however, at one N-responsive site, application of N in two splits significantly increased yield and grain 15N uptake over application of N in a single dose. 15N balances showed losses of 11-33% of applied fertilizer N. On the basis of N distribution in the soil profile, leaching was postulated to have been a problem at the wettest site, whereas ammonia volatilization appeared to have occurred at the less humid trials. 15N uptake by a cowpea (Vigna unguiculata (L.) Walp.) intercrop or relay crop was low in all trials.

Issue

Section

Research Papers