Abstract
Abstract Plots were established at the Central Crops Research Station, Clayton, NC, on 11 Apr in a field with a Norfolk loamy sand soil. Individual plots were 2 rows (1.14 m apart) wide by 22 plants (ca. 13.7 m) long and were arranged in a randomized-complete block design with 5 treatments and 4 blocks. To conserve soil moisture and reduce erosion, beds were formed in early spring; therefore, before application the beds were leveled to final transplant height by pulling the transplanter through the test site. On 13 May, the granular materials were applied to the preformed beds through 2 fertilizer shanks attached to an electrically driven, granular applicator. The shanks were positioned 12 cm on each side of the row center and 10 cm below the final bed surface. Tobacco was transplanted on 13 May with a 2-row transplanter. Soil moisture was good. Once a week after transplant, all plants in 1 row of the plot (20) were rated for aphid abundance (0-7). Using this aphid abundance data, the avg aphid rating was calculated. Aphid ratings were subjected to ANOVA and WD, K = 100, was used to separate treatment means.
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