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De Crop and Soil Science, Washington State Univ., WA 98i64-6420;
International Rice Research Institute, P. 0. Box 933, 1099 Manila, Philippines.
* Corresponding author.
The addition of N fertilizer late in the growing season to improve grain quality is a potential management option for production of irrigated hard red spring wheat (Triticum aestivum L.). This study compared the recovery of fertilizer N applied at planting with that of fertilizer N applied at anthesis, and evaluated the effects on soil N uptake. In a 2-yr field study, N fertilizer rates of 120, 180, or 240 kg N ha–1 at planting and 0,30, or 60 kg N ha–1 at anthesis were applied to ‘Yecora Rojo’ wheat. The experiment utilized a duplicate plot design such that for every N-rate treatment there were two plots, one plot received 15N labeled fertilizer at planting, and the other received I5N labeled fertilizer at anthesis. The recovery of N applied at planting ranged from 30 to 55%, while that of N applied at anthesis ranged from 55 to 8090. The contribution of soil N (non-fertilizer N) to total plant N was not affected by the N rate or timing of application. In another field study 120,180, or 240 kg N ha–1 was applied at planting and 0 or 45 kg N ha–1 at anthesis the first year, and 85, 140, 195, and 250 kg N ha–1 applied at planting and 0, 25, 45, and 65 kg N ha–1 at anthesis the second year. A small dose (< 1 kg ha–1) of NH4-15N was iqjected 5 cm below the soil surface to follow the effect of N application at anthesis on uptake of existing inorganic soil N. Fertilizer N at anthesis increased the amount of iqjected 15N taken up by the plants from 38 to 48% the first year, and from 49 to 61% the second year. In both studies, the amount of fertilizer N applied at anthesis had the greatest influence on postanthesis N uptake, which ranged from 17 to 77 kg N ha–1. Without supplemental N applied at anthesis, postanthesis N uptake only provided from 12 to 18% of the total grain N demand, and postanthesis N uptake was not increased by greater preplant N input levels. Likewise, extractable and mineralizable soil N at anthesis were not affected by preplant N treatments. These results indicate that a late N application can be efficiently taken up by plants, and does not decrease soil N uptake. To achieve acceptable grain protein levels for bread wheat in this.imgated cropping system, N should be supplied late in the season to improve N uptake during grain fill.
Received for publication March 7, 1991.
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