The Growth of the Foliage and Fruit of the Apple in Relation to the Maintenance of a Spray Coating1

Publisher Website
Google Scholar
Abstract
The writer has spent part of his time during three summers investigating the problem presented here. The data presented in this paper covers the last year's work. Methods are presented whereby the increase in leaf area of leaves on the trees was obtained at weekly intervals and methods for collecting and determining the quantity of arsenic trioxide upon large samples of foliage and fruit collected at weekly intervals throughout the growing season. The paper then discusses the relation of the increase in size of the foliage and of the apples and the quantity of arsenic trioxide upon the leaves and the apples as indicated by data taken at approximately weekly intervals. The data shows that during the active growing season much of the reduction in arsenic trioxide per unit area is due to increase in leaf growth. During the period extending from about July 10, at which time most of the leaf growth had occurred, until September 14, when the experiment was discontinued, there was a reduction of approximately 66 per cent of the arsenic trioxide upon the leaves. Most of this loss was due to weathering. The increase in diameter of the apples occurred at a fairly uniform and even rate from the beginning of growth to September 14. The increase in surface area of the apples was more rapid as the season advanced and the increase in volume of the apples still more rapid. The reduction in the quantity of arsenic trioxide per unit area of apple or per pound of fruit from June 29, when the last spray was applied, to September 14th, was mostly due to increase in growth. The loss of arsenic trioxide on the apples due to weathering was proportionally much smaller than that which occurred on the foliage.

This publication has 0 references indexed in Scilit: