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A Method for Measuring Short‐Term Nutrient Absorption by Plants: III. Nitrogen
Author(s) -
DeMent J. D.,
Stanford George,
Hunt C. M.
Publication year - 1959
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/sssaj1959.03615995002300050022x
Subject(s) - loam , nitrogen , soil water , chemistry , nutrient , fertilizer , moisture , agronomy , absorption (acoustics) , crop , zoology , horticulture , botany , environmental science , biology , soil science , physics , organic chemistry , acoustics
Roots of intact, N‐deficient oat plants proliferated rapidly in contact with both N‐fertilized and unfertilized soils, and recovery in top growth of 10 to 40 mg. of N applied as (NH 4 ) 2 SO 4 ranged from 67 to 38.5% after 7 days. Recovery by whole plants (tops + roots) ranged from 93 to 62%. During the same period, uptake from ureaform was about one‐third that of the soluble sources. No differences in uptake from NaNO 3 , (NH 4 ) 2 SO 4 , and urea in 7 days were found. Since selective absorption of NO 3 ‐ and NH 4 + ions by oat plants was not apparent under the experimental conditions, this crop is regarded as a suitable one for evaluating relative potential availability of N sources and factors influencing N uptake by the short‐term method. N uptake from fertilizer with time described a sigmoid curve. The moisture equivalent was approximately the soil moisture level at which maximum N uptake occurred from Hartsells fine sandy loam and Webster silty clay loam. A highly significant linear correlation (r = 0.98) was found between N content of whole plant and tops based on combined analysis of data obtained with 2 soils, 3 N sources, 3 uptake periods, and 4 levels of N.