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Nitrate nitrogen in leaves and petioles of sugar beet in relation to yield of sugar and juice purity

Published online by Cambridge University Press:  27 March 2009

P. J. Last  and
P. B. H. Tinker
P. J. Last
Affiliation:
Broom's Barn Experimental Station, Higham, Bury St Edmunds
P. B. H. Tinker
Affiliation:
Broom's Barn Experimental Station, Higham, Bury St Edmunds
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Summary

The use of the correct N dressing for beet is important, as any excess decreases juice purity and profit, and may decrease sugar yield, but no analytical method will at present predict the best dressing in any particular field. The concentration of nitrate in leaves and petioles of beet was determined to test if it would determine the need for top-dressings of N. Beet on seventeen field trials in 3 years testing N were sampled. Nitrate in a wet tissue extract was determined by reducing to ammonia with titanous sulphate and subsequent distillation.

The petiole nitrate concentration decreased sharply with time, from around 1000 ppm in wet tissue in early June to less than 100 ppm in early September. The nitrate concentrations were closely related to nitrogen dressing, and the rapid decline in concentration was decreased by top-dressings. Comparison of samples taken in June showed that most of the variation between the experiments could be accounted for by the different ages of the plants. Sodium fertilizer had no effect on nitrate content.

Petiole nitrate was inversely related to juice purity and sugar concentration, especially when the nitrate content exceeded 700 ppm in June.

On average, petiole nitrate concentrations about 800 ppm in June were associated with the largest sugar yields, but the content could not be used to predict nitrogen top-dressing requirement accurately at individual sites.

Measuring NO3-N cannot at present be recommended as a method for deciding how much nitrogen fertilizer to use, but it has value for detecting severe deficiencies and in research.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 71 , Issue 3 , December 1968 , pp. 383 - 392
Copyright
Copyright © Cambridge University Press 1968

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