The Field Testing of Copper-spray Coatings

100 grams fresh 3-4-50 Bordeaux mixture amount of spray apple leaves basis of milligrams BEARING GRAPEFRUIT TREES Burgundy mixture c. c. of distilled c. c. portions c. c. Prepare CELERY AT BRADENTOWN chemically pure nitric color comparison containing one-half copper content copper per 100 copper sulphate copper-containing sprays COPPER-SPRAY COATINGS Crozet crystals of copper Date sampled dilutions Dissolve 3.928 grams distilled water FEBRUARY 21 FIELD TESTING GRAMS DRY WEIGHT grams fresh weight grams of pure grower indicated July 19 July 26 leaf sample least three minutes leaves sprayed maximum limit MILLIGRAMS OF COPPER milligrams per 100 Nursery Orchard persistence of copper-containing plats potassium ferrocyanid potassium-ferrocyanid solution pounds of bluestone pure nitric acid Reading solution of potassium sour-orange spray application spray coating spray practice spray residue standard copper solution stock solutions TESTING OF COPPER-SPRAY tests for copper transition zone TREES AT WINTER wash water weight of leaves WINTER PARK