By N.C. Brady (Ed.)
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Additional resources for Advances in Agronomy, Vol. 27
Hydrolysis of Starch Hofmann and Seegerer ( 1951a), Krasil’nikov ( 1952), and Ukhtomskaya (1952) were the first to mention that soils contain amylases, but ENZYMES ACCUMULATED IN SOIL 31 they did not fully describe the methods used. Drobnik (1955) and Hofmann and Hoffmann (1955) developed and described methods to determine amylase activity in soil. Toluene was used to prevent microbial proliferation. According to Galstyan ( 1965a, 1974), amylolysis in soil samples incubated in the presence or in the absence of toluene for 24 hours is of the same intensity.
Increased growth under desiccating conditions should also select for improved rates of protein synthesis and nitrate reductase activity since these are generally positively correlated with high rates of growth. Additional benefits would be increased seedling emergence in dry soil and continued leaf growth during moderate drought. There is also a possibility that elongation of stamens, styles, and possibly germination tubes of pollen grains could be enhanced if the effects of seedling selection carried over to flowering.
1955) showed that in soils which were very permeable and low in urease activity, urea application leads to great losses through leaching because the urea introduced into soil cannot by hydrolyzed to ammonium carbonate. In connection with the role of urease in the efficiency of fertilizing with urea, Rotini (1956) has drawn attention to a new point of view. The accumulated urease splits urea and prevents isomerization of urea to ammonium cyanate. According to Rotini, the ammonium cyanate should be responsible for the phytotoxic effects sometimes observed after urea fertilization.
Advances in Agronomy, Vol. 27 by N.C. Brady (Ed.)