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Interpreting the Rate of Change in Nitrate‐Nitrogen in Sugarbeet Petioles 1
Author(s) -
Carter J. N.,
Jensen M. E.,
Bosma S. M.
Publication year - 1971
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1971.00021962006300050004x
Subject(s) - growing season , nitrogen , agronomy , sucrose , petiole (insect anatomy) , yield (engineering) , irrigation , crop , nitrate , biology , nutrient , human fertilization , horticulture , chemistry , botany , ecology , hymenoptera , biochemistry , materials science , organic chemistry , metallurgy
Nitrate‐nitrogen in sugarbeet petioles is used to evaluate current N status of sugarbeet crops. Since the NO3‐N changes rapidly during the season, better relationships are needed to interpret these data relative to sugarbeet N nutrition. Sugarbeets ( Beta vulgaris , L.) were grown at four N fertilization rates and two irrigation levels to determine the root yield, sucrose percentage, sucrose yield, and N uptake in relation to the NO 3 ‐N concentration in the petioles. NO 3 ‐N in beet petioles increased to a peak concentration and then decreased exponentially during the two growing seasons on all treatments. The exponential decrease after the peak enables prediction of the NO 3 ‐N in the petioles during the remainder of the growing season. This rate of change approach can be used to predict N needs when adding supplemental N for sugarbeets and to characterize the N status of soil‐crop systems.