New PDF release: Advances in Agronomy, Vol. 28

By N.C. Brady (Ed.)

ISBN-10: 0120007282

ISBN-13: 9780120007288

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The rate of CER may be considered as the most 28 E. A. N. GREENWOOD comprehensive single measurement that can be taken to indicate instantaneous growth rate of the plant. So it would seem to be an ideal way of obtaining a rapid assessment of nitrogen stress, or any other nutritional stress. In practice it has some limitations. First, the initial cost of the apparatus for determining carbon dioxide concentration (infrared gas analyzer) is great, its use in the field is a little cumbersome, and it has a high maintenance requirement.

The particular defoliation regimes used reduced SNR from 32 to 19% in the pot experiment and from 11 to 3%in the grazing experiment. These examples probably underestimate the immediate effect of defoliation on SN since the latter was, of necessity, estimated during the ungrazed recovery period. One of the general, and important, effects of cultivation is to increase the supply of available nitrogen to a crop. This should result in a reduction of stress provided that there is a deficiency of nitrogen and that cultivation does not affect other limiting factors.

Biol. Sci. 20, 51-66. Bouma, D. Aust. J. Biol. Sci. 20,601-612. Bouma, D. 1967c. Aust. J. Biol. Sci. 20,613-621. Bouma, D. 1969a. Aust. J. Agric. Res. 20,435-445. Bouma, D. 1969b. Aust. J. Biol. Sci. 22,523-533. Bouma, D. 1970a. Ann. Bot. 34,1131-1142. Bouma, D. 1970b. Ann. Bot. 34,1143-1153. Bouma, D. 1970c. Proc. Int. Grassl. , 11th. 1970 pp. 347-350. Bouma, D. 1971. Aust. J. Agric. Res. 22,723-730. Bourn, D. 1975. J. Bot. 26,42-59. , and Dowling. E J. 1966. Aust. J. Agric. Res. 17,647-655. , and Dowling, E.

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Advances in Agronomy, Vol. 28 by N.C. Brady (Ed.)

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