The effect of rate and timing of late nitrogen application to breadmaking wheats as ammonium nitrate or foliar urea-N, and the effect of foliar sulphur application. I. Effect on yield, grain quality and recovery of nitrogen in grain

Dampney, P.M.R.; Salmon, S.

Aspects of Applied Biology 25: 229-241


ISSN/ISBN: 0265-1491
Accession: 002247973

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In field trials in 1987-89 the effects of 0-180 kg extra N/ha (in addition to a standard rate of N for yield) as prilled ammonium nitrate-N applied at growth stage 32 or as foliar urea-N sprays applied to wheat at growth stage 75 with 10 kg micronized S applied in combination with foliar urea at the 30, 60 and 120 kg/ha rates were investigated. Grain N increased with both sources of extra N up to the max. rate tested (180 kg N/ha) but the recovery of applied N in the grain dropped as the rate of application increased. Increases in grain N from up to 90 kg extra N/ha were greater from foliar urea (0.11% per 30 kg N/ha) than from ammonium nitrate (0.09% N per 30 kg N/ha) but ammonium nitrate had a greater effect on yield. Extra N increased grain SDS sedimentation volume but max. values were obtained at lower N rates than for grain N. Responses to extra N were smaller in 1989 due to a summer drought. In a 2nd series of field trials the effects of 30 or 40 kg extra N/ha (in addition to a standard rate of N for yield) applied at 10 d intervals from flag leaf emergence to caryopsis hard growth stages were investigated. Also the effects of 10 kg micronized S/ha in combination with foliar urea at 30, 40 and 50 d after growth stage 39 were investigated. Application of N during milk development gave the highest grain N content but not the highest yield. A response of grain N to S application occurred at only one site, and grain S levels were not increased by S applications.