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Efficiency of Different Nitrogen Forms As Tested By Barley Seedlings¹

ABSTRACT

A study using modified Neubauer technique was carried out to evaluate the efficiency of the soil organic N and the soil-fixed NH₄⁺ 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 NO₃^- 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 NH₄⁺ 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 NO₃^-, at the rate of 1.20 mg of fixed N and 0.88 mg of soil N/mg N added as NO₃^-. An equation representing the uptake of N from the three sources was established and their contribution to the plant content of N was calculated.

¹ Contribution from the Dept. of Soil & Water Sciences, University of Alexandria, Alexandria. Egypt, UAR.

² Professor of Soils and graduate student, respectively.

Received for publication January 25, 1971. Accepted for publication March 19, 1971.