The field testing of copper-spray coatings . -50 Bordeaux mix-ture; B and E, with 2-2§-50 Bordeaux mixture; and Cand F, with 1-1J-50 Bordeaux mixture. A, B,and C were in Nursery I; D, E, and Fin Nursery II. February and March, 1918, on two nursery plantings of overgrownsour-orange stock. In Nursery I the trees were about 6 feet high;in Nursery II about 3 feet. A bucket spray pump was used, and ineach nursery measured amounts of spray were applied to equallengths of the nursery rows to secure a distribution of the spray asequal as possible. The fresh weight of each leaf sample approxi-mated 100
The field testing of copper-spray coatings . -50 Bordeaux mix-ture; B and E, with 2-2§-50 Bordeaux mixture; and Cand F, with 1-1J-50 Bordeaux mixture. A, B,and C were in Nursery I; D, E, and Fin Nursery II. February and March, 1918, on two nursery plantings of overgrownsour-orange stock. In Nursery I the trees were about 6 feet high;in Nursery II about 3 feet. A bucket spray pump was used, and ineach nursery measured amounts of spray were applied to equallengths of the nursery rows to secure a distribution of the spray asequal as possible. The fresh weight of each leaf sample approxi-mated 100 grams. Figure 3 shows the relative agreement of thefield test results with the strengths of spray applied. Plat F wassprayed with the others on February 21, but the first sample was lost. THE FIELD TESTING OF COPPER-SPRAY COATINGS. 7 CELERY AT BRADENTOWN, FLA. Figure 4 shows the behavior of Bordeaux mixture on celery atBradentown, Fla., in February and March, 1918. Each growerprepared and applied the mixture in his own way to plantings of. Fig. 4.—Field tests for copper on celery leaves. Four fields were sprayed by the owners with Bordeauxmixture supposedly made up in each case with 6 pounds of bluestone in 50 gallons. A hypotheticalsafety zone is indicated between the 35 and 45 milligram tests. The actual determinations are indi-cated by O, the estimated interpolations by X. 1 or more acres. In every case the grower claimed that 6 poundsof bluestone were used in 50 gallons of the Bordeaux mixture. Knap-sack sprayers were used. With the exception of field D one or 8 BULLETIN 785, U. S. DEPARTMENT OF AGRICULTURE. more applications had been made before testing began. Whensamples could not be taken immediately before and after a sprayapplication, estimates have been made from the previous or sub-sequent direction of the graph to determine the probable values,and such approximations are indicated by X rather than by 0 inplotting. The owner of field A, besides guessing at the qu
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