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• W2043925418 abstract "Using 15N-labelled legume material (Medicago littoralis) and fertilizers (urea, (NH4)2SO4, KNO3), a direct comparison has been made of the fate of nitrogen from these sources and their residues, in soils sown with two successive wheat crops. The availability of N from each source to both crops is discussed in terms of the release, movement and immobilization of N in the soil profiles. For fertilizer 15N, uptake by crops, distribution as inorganic 15N in soil profiles, total recovery and percentage recovery in organic residues in soil were not significantly influenced by the form of fertilizer applied. For both legume and fertilizer 15N, uptake by both crops was directly related to input; and uptake by the second crop was directly related to the amounts of 15N residual in soil after the first crop. About 17% of applied legume N was taken up by the tops of the first wheat crop, and, at the time of sowing of the second crop, about 62% remained as organic residues; total recovery in crop and soil averaged 84%. By contrast, about 46% of applied fertilizer N was taken up by crop 1, and at sowing in the following year 29% was present as organic residues, and total recovery in soil plus crop averaged 80% The availabilities of N from both legume and fertilizer residues to a second wheat crop declined markedly but continued to differ significantly (P < 0.01) from each other. Expressed as percentages of total residual 15N present in soils at sowing, the second crop took up about 6% of legume-derived N and about 9% of fertilizer-derived N. Fertilizer N directly contributed 5% and 0.5% respectively of the N of first and second wheat crops, per 10kg of fertilizer N applied ha−1. Under the same conditions, legume N directly contributed about 2% and 1% respectively of the N of successive crops, per 10 kg of legume N applied ha−1. The proportions of grain N derived from the applied sources were higher than those of straw N. For both legume and fertilizer 15N, the amounts of inorganic 15N present in soil profiles at sowing in successive years were directly related to 15N inputs. A small but statistically-significant departure from linearity was observed for inorganic 15N at sowing of crop 2 when related to total recoveries of 15N in soils at that time; the higher the amount of 15N recovered, the greater the proportion present as inorganic 15N in the soil profile. The respective contributions of legume and fertilizer N to the total inorganic N pool in soil at sowing declined each year, but were similar to their contributions to the N of the following wheat crop. Concentrations of inorganic N and 15N in soil profiles varied each year but their patterns of distribution in cropped soils were not influenced by the nature and amount of the initial amendments. The 15N atom% enrichments of the inorganic N at sowing in the cropped soils were relatively uniform throughout the profile." @default.
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• W2043925418 date "1986-01-01" @default.
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• W2043925418 title "The fate of nitrogen from legume and fertilizer sources in soils successively cropped with wheat under field conditions" @default.
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• W2043925418 doi "https://doi.org/10.1016/0038-0717(86)90048-9" @default.
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