. Effect of soil applications of insecticides on the growth and yield of vegetable crops . Figure 1.—Three-acre site near Oxnard, Calif., used for studying the effect of soil applications of insecticides on various crops. injected into the soil 6 to 7 inches deep, at 12-inch spacings, with a soil-fumigant applicator, the dosage being equivalent to 54 pounds per acre. A heavy steel bar attached to the rear of the applicator sealed any openings made by the injector blades. To prevent relocation of the insecticides at lower soil depths, the soil was never ploughed. The formation of a plow sole wa
. Effect of soil applications of insecticides on the growth and yield of vegetable crops . Figure 1.—Three-acre site near Oxnard, Calif., used for studying the effect of soil applications of insecticides on various crops. injected into the soil 6 to 7 inches deep, at 12-inch spacings, with a soil-fumigant applicator, the dosage being equivalent to 54 pounds per acre. A heavy steel bar attached to the rear of the applicator sealed any openings made by the injector blades. To prevent relocation of the insecticides at lower soil depths, the soil was never ploughed. The formation of a plow sole was pre- vented by subsoiling 20 inches deep, at 20-inch spacings, prior to winter rains, on December 5, 1949, and on December 15, 1950. A deficiency in rainfall during the years in which these experiments were conducted (table 1) made it necessary to irrigate the plots before planting, usually in March. This is a common practice among growers during years of light rainfall. The effect of the treatments on the plant stand was determined by counting the plants in each row before harvesting.
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Keywords: ., bookcentury1900, bookpublisherwashingto, booksubjectinsecticides
