Abstract
Maize variety "Izbulk" was used to establish the best source and time of application of nitrogen to avoid nitrate leaching, urea, calcium ammonium nitrate (CAN) and sulphur coated urea (SCU), each @ 150 kg N ha-' were applied. urea and CAN were applied, all at sowing, in 2 splits (half at sowing and half with 2nd irrigation) and 3 splits (1/3 at sowing, 1>3 with 2nd irrigation and 13 at tasselling) while SCU was applied only at sowing time. A constant measured normal level of irrigation water was applied. Grain yield was not affected significantly, however, average response i.e., kg grain kg N application was maximum with urea applied all at sowing. Effect on N uptake was also at par, however, N recovery was maximum with urea application in 2 and 3 splits. NO,-N concentration, in general, decreased gradually in the soil profile at har\>esting and was comparatively lower than before sowing N03-N status. Number of splits were intended to increase NOrN, however, most of it was concentrated in 0-60 cm depth with all the sources. Urea and CAN, all at sowing, contributed less NO, in the profile while from CAN it was more. Overall, less NO, was observed from urea split application compared to CAN and SCU. This indicates more chances ofNd, leaching from CAN and SCU.
M. Yaseen,, M. Aslam,, A. Khaliq*, , M.F. Gilani*** . (1994) EFFECT OF SOURCE AND TIME OF N APPLICATION ON N03 MOVEMENT IN SOIL AND N UPTAKE BY MAIZE, The Journal Soil & Environment , Volume 9, Issue (1-2).
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