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- W2007695959 abstract "Abstract Hydroponic and greenhouse studies have shown that grain yields of wheat ( Triticum aestivum L.) are maximized when the N supply contains a mixture of NH 4 and NO 3 . Tillers per plant is the yield component most commonly increased by mixed N nutrition in greenhouse studies. The objective of this study was to evaluate, under field conditions, the response of ‘Butte 86’ spring wheat to N sources differing greatly in nitrification rate. Nitrogen was applied at 0 or 112 kg N ha ‐1 ; the N sources were calcium nitrate (CN), urea, ureadicyandiamide (DCD), 0.1‐g urea granules, and 0.1‐g urea–DCD granules. Six field trials were performed. Topsoil (0–15 cm) analysis of fertilized plots during tillering indicated a wide range of mineral N contents (19–101 mg N kg ‐1 ) and of NH 4 :NO 3 mole ratios (0.04–2.06). Correlation analyses suggested that tillering was sensitive to the total mineral N supply, but quite insensitive to the NH 4 :NO 3 ratio in the topsoil. Vegetative growth and N uptake were generally lower for CN than for the other N sources. At some locations, more heads per square meter at harvest were observed with the slower‐nitrifying N sources. Grain yields were increased by N fertilization, but significant differences between N sources were not generally observed. For both years of the study, the 0.1‐g urea‐DCD granules gave the highest N uptake efficiency. However, the dramatic responses in growth, tillering, or grain yield routinely observed with mixed N nutrition in hydroponic or greenhouse studies could not be duplicated in the field." @default.
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- W2007695959 date "1999-03-01" @default.
- W2007695959 modified "2023-09-26" @default.
- W2007695959 title "Response of Spring Wheat to Nitrogen Fertilizers of Different Nitrification Rates" @default.
- W2007695959 doi "https://doi.org/10.2134/agronj1999.00021962009100020018x" @default.
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