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Petioles tell the nitrogen story for strawberries

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Authors

Albert Ulrich, Plant Nutrition
William W. Allen, University of California, Berkeley.

Publication Information

California Agriculture 25(6):8-8.

Published June 01, 1971

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Abstract

Abstract Not Available – First paragraph follows: The petiole (leaf stalk) of a young fully expanded strawberry leaf indicates the nitrogen content of the strawberry plant when it is tested either by the “quick test” with diphenylamine reagent or by a laboratory analysis using either the phenoldisulfonic acid procedure or the new nitrate electrode method. In the quick test, if a drop of diphenylamine reagent placed on the cut surface of the petiole (cut at a slant) turns blue immediately, the strawberry plant is well supplied with nitrogen and fertilizing with nitrogen at that time is usually not warranted. If, however, the test is negative, as indicated either by a lack of blue color formation or by a browning of the cut surface, fertilizing with nitrogen is indicated·–provided, of course, that there is sufficient growing weather remaining for the crop to benefit from nitrogen fertilization.

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Author notes

The California Strawberry Advisory Board supported this research.

Petioles tell the nitrogen story for strawberries

Albert Ulrich, William W. Allen
Webmaster Email: wsuckow@ucanr.edu

Petioles tell the nitrogen story for strawberries

Share using any of the popular social networks Share by sending an email Print article
Share using any of the popular social networks Share by sending an email Print article

Authors

Albert Ulrich, Plant Nutrition
William W. Allen, University of California, Berkeley.

Publication Information

California Agriculture 25(6):8-8.

Published June 01, 1971

PDF  |  Citation  |  Permissions

Author Affiliations show

Abstract

Abstract Not Available – First paragraph follows: The petiole (leaf stalk) of a young fully expanded strawberry leaf indicates the nitrogen content of the strawberry plant when it is tested either by the “quick test” with diphenylamine reagent or by a laboratory analysis using either the phenoldisulfonic acid procedure or the new nitrate electrode method. In the quick test, if a drop of diphenylamine reagent placed on the cut surface of the petiole (cut at a slant) turns blue immediately, the strawberry plant is well supplied with nitrogen and fertilizing with nitrogen at that time is usually not warranted. If, however, the test is negative, as indicated either by a lack of blue color formation or by a browning of the cut surface, fertilizing with nitrogen is indicated·–provided, of course, that there is sufficient growing weather remaining for the crop to benefit from nitrogen fertilization.

Full text

Full text is available in PDF.

Author notes

The California Strawberry Advisory Board supported this research.


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