The effect of certain sprays and washes upon the chlorophyll content in apple leaves

Kessler, W.

Gartenbauwissenschaft 13: 154-168

1939


ISSN/ISBN: 0016-478X
Accession: 013558219

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Abstract
It was found that spraying apple trees with 2% lime-sulphur and 1% lead arsenate preparation or with a new preparation containing no arsenic gave an increase of the chlorophyll content in apple leaves (10% to 30% more per unit leaf area as compared with the leaves of untreated trees). The result was similar to that obtained from ample application of nitrogenous fertilizers. Applications of nitrogen together with spraying resulted in a 30% to 100% increase of the chlorophyll content.