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A study was conducted to compare a single nitrogen application in March (125 kg N/ha) vs. a split application in March (75 kg N/ha) and October (50 kg N/ha) on 15-year-old `Maramec'. After one season, N application time did not affect return bloom. A split N application increased trunk wood Kjeldahl-N but decreased Kjeldahl-N in the current season's reproductive shoots and 1-year-old branches compared to a single application in March. Kjeldahl-N concentration was not affected by treatment in current season's vegetative shoots, trunk bark or roots. Nitrate-N concentration was not affected by treatment in any tissue sampled. Between the first week of October and the first killing frost in November, Kjeldahl-N increased 29% in current season's shoots, 21% in trunk bark, 32% in roots &gt;1 cm in diameter, and 15% in roots &lt;1 cm in diameter but decreased 42% in trunk wood and 5% in 1-year-old branches. Roots &lt;1 cm in diameter accumulated more nitrate-N than other tissues during November.

291 Effect of Nitrogen Fertilization Time on Nitrogen Storage and Return Bloom of Pecan