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Uptake, Translocation and Utilization of 15N‐Depleted Fertilizer in Irrigated Corn
Author(s) -
Bigeriego Manuel,
Hauck R. D.,
Olson Robert A.
Publication year - 1979
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1979.03615995004300030020x
Subject(s) - stover , sowing , agronomy , fertilizer , nitrogen , human fertilization , chromosomal translocation , crop , field experiment , environmental science , biology , chemistry , biochemistry , organic chemistry , gene
Abstract The objective of this study was to derive a better understanding of the manner in which N serves the nutritional needs of corn ( Zea mays L.) and thereby afford a basis for improved fertilization practices. Measurements of uptake, translocation and utilization of tagged nitrogen (N) fertilizer in irrigated corn as influenced by time and rate of N application were made in a field experiment at the University of Nebraska Field Laboratory. Plant parts of root, crown, foliage, and eventually ear and grain were taken and analyzed for total N, NO 3 ‐ ‐N and isotope ratio at eight growth stages. Application of N at planting resulted in greater vegetative production, but summer sidedressed N effected slightly larger grain production with a higher grain/stover ratio. Isotope ratio analyses revealed significantly greater utilization of fertilizer N in grain production with delayed application due to more active root uptake and translocation of the fertilizer source during the grain filling period. Following harvest, residual mineral N in soil from applied fertilizer was greater with summer sidedressing such that 24% more of the N applied could be accounted for in the crop and soil than with planting time application.