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Efficiency of Different Nitrogen Forms As Tested By Barley Seedlings
Author(s) -
Balba A. Monem,
Shabanah M. R.
Publication year - 1971
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/sssaj1971.03615995003500040033x
Subject(s) - hordeum vulgare , chemistry , nitrogen , nitrate , agronomy , zoology , horticulture , environmental chemistry , poaceae , biology , organic chemistry
A study using modified Neubauer technique was carried out to evaluate the efficiency of the soil organic N and the soil‐fixed NH 4 + to supply barley seedlings ( Hordeum vulgare L.) with N in the absence and presence of nitrate increments. The results showed that in the absence of NO 3 ‐ increments, the seedlings absorbed the mineralized soil organic N at the rate of 0.065 mg N/mg soil organic N and the soil‐fixed N at the rate of 0.27 mg N/mg fixed N. The efficiency of the soil‐fixed NH 4 + was 4.18 times that of the soil organic N. The absorption of the fixed N and the mineralized organic N increased with increments of NO 3 ‐ , at the rate of 1.20 mg of fixed N and 0.88 mg of soil N/mg N added as NO 3 ‐ . An equation representing the uptake of N from the three sources was established and their contribution to the plant content of N was calculated.