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Accounting for slow drainage and hysteresis in irrigation scheduling (1989)

Parkes, M. E. ; Naysmith, D. B. ; McDowall, M. A.

Springer

Irrigation science 10 (1989), S. 127-140

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ISSN: 1432-1319

Source: Springer Online Journal Archives 1860-2000

Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

Notes: Summary Soils continue to drain for several days following irrigation. Water budgeting predictions can be improved by accounting for this, provided hysteresis is recognized in the “field capacity” condition. Uncertainty in this condition was evident in experiments comparing predicted soil water depletions with neutron probe measurements. Comparisons were made for potato, lettuce and calabrese crops, irrigated by hose-reel machine. Best agreement between measurements and predictions was obtained when excess water storage above a lower field capacity condition was allowed for; corresponding to minimum root mean square errors of 3.2 mm–6.2 mm. These were comparable to the practical limits of uncertainty associated with field depletion measurements.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00265689

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A comparison of moving belt interfaces for liquid chromatography mass spectrometry (1984)

Games, D. E. ; McDowall, M. A. ; Levsen, K. ; [et al.]

Chichester : Wiley-Blackwell

Biological Mass Spectrometry 11 (1984), S. 87-95

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ISSN: 0306-042X

Keywords: Chemistry ; Analytical Chemistry and Spectroscopy

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: Using mono-, di-, tri- and tetrasaccharides, nucleosides, bile acids, riboflavin, gibberellin A3, aminoglycosides, flavanoid and cardenolide glycosides, the sodium salt of riboflavin phosphate and the quaternary ammonium drug propantheline bromide, the performance of a new moving belt interface for liquid chromatography mass spectrometry has been evaluated. It is shown to be superior to previous interfaces of this type in its ability to provide relative molecular mass information from thermally labile low volatility compounds. The spech a obtained are similar to those obtained by desorption chemical ionization.

Additional Material: 5 Ill.