A study of soil nitrogen organic fractions and correlation with yield response of Sudan-sorghum hybrid grass on Quebec soils |
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Authors: | S Kadirgamathaiyah A F Mackenzie |
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Institution: | (1) Department of Agriculture, Peradeniya, Ceylon;(2) Macdonald College of McGill University, Quebec, Canada |
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Abstract: | Summary Acid-hydrolysable organic nitrogen fractions were determined before and after two crops of Sudan-sorghum hybrid grass grown
in a growth chamber on twenty Quebec soils. The relationship between the organic nitrogen fractions and yield response to
N fertilizer and N uptake was examined by correlation methods and compared with corresponding relations obtained using incubation
and boiling water extraction methods as indices of soil N availability.
Mean contributions to total N lost during growth of the two crops were: hydrolysable NH
4
+
-N−19%, amino acid N−16% and hexosamine N−2%. The amino acid N, hydrolysable NH
4
+
-N and total hydrolysable N were significantly correlated with percent yield, log percent yield decrement and N uptake. Better
correlations were obtained with the incubation and boiling water extraction methods than with the organic-N fractions.
Contribution from Department of Soil Science, Macdonald College of McGill University. |
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Keywords: | |
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