. Bulletin. Agriculture -- New Hampshire. February, 1930] agricultural experiments 1929 19 of the trees were found to carry a larger amount of residue than those on the upper branches. A close correlation exists between the amounts of arsenic present and the quantity of lead residue, although the amount of lead recovered is slightly less than would be expected in combination with the amount of arsenic present. Slightly over 23 per cent of the apples receiving three sprays of arsenate of lead, at the rate of two pounds to 50 gallons of spray, contained enough arsenical residue to exceed the tol
. Bulletin. Agriculture -- New Hampshire. February, 1930] agricultural experiments 1929 19 of the trees were found to carry a larger amount of residue than those on the upper branches. A close correlation exists between the amounts of arsenic present and the quantity of lead residue, although the amount of lead recovered is slightly less than would be expected in combination with the amount of arsenic present. Slightly over 23 per cent of the apples receiving three sprays of arsenate of lead, at the rate of two pounds to 50 gallons of spray, contained enough arsenical residue to exceed the tolerance. Calcium arsenate used at 13/^ pounds to 50 gallons of water left a residue which exceeded the tolerance on per cent of the apples. None of the apples given one spray of lead arsenate contained an excess of arsenic; calcium arsenate in excess of the tolerance remained on two per cent of the apples given one spray. Thirty-four per cent of the apples given three sprays, and per cent of the apples given only one cover spray, contained a residue of lead in excess of the tolerance. The analyses were made by S. R. Shimer, G. P. Percival, and A. D. Robinson under the direction of T. G. Phillips. G. F. Potter directed the spraying. {Purnell Fund.) PREVENTING FUMIGATION INJURY IN GREENHOUSES The composition of the Bordeaux mixture used on greenhouse plants before fumigation with cyanide is found by R. R. Jenkins and O. Butler to have a marked effect on the severity of injury from fumigation. Mix-. Figure 4.—Both of tht'se plants were sprayed with the same materials and then fumi- gated. Later the one at the right was wetted, and the one at the left not. Wetting was not found injurious, however, when a neutral Bordeaux mixture was Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original New Hampshire
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