IMPACT OF INSECTICIDE SCHEDULE, N AND K RATES, AND TRANSPLANT CONTAINER SIZE ON CABBAGE YIELD

The impact of two insecticide spray application schedules (weekly or o n demand), three N and K rates [1x, 1.5x, and 2x; 1x = (kg.ha-1) 130N- 149K], and two transplant container cell sizes [small, 21 mm wide x 51 mm deep (7.5 cm3), and large, 38 mm wide x 70 mm deep (33.7 cm3)] on 'Market Prize' cabbage (Brassica oleracea L. Capitata group) yield was investigated in Fall and Winter 1982-83 and Spring 1983. Fenvalerate was sprayed at 0.112 kg.ha-1. For the weekly schedule, 10 sprays were applied in fall and winter and nine in spring; for the on-demand sched ule, two sprays were applied in both seasons. There were more insect-d amaged heads in both seasons in the plots sprayed on demand than in th ose sprayed weekly. In fall and winter, the combination of a weekly sc hedule with 1.5x and 2x N and K rates increased marketable yields over those of the on-demand schedule. Marketable yields at the 1.5x and 2x N and K rates were similar for plants in small or large transplant co ntainer cells, but the 1x N and K rate applied to plants in small cell s reduced yields. In spring, both application schedules produced simil ar yields, but yield increased with increasing N and K rates and large transplant container cells. Insecticide application schedule and cell size did not affect leaf nutrient concentration significantly, but in creasing N and K rates resulted in higher N, P, and K leaf concentrati ons. Concentrations of N and K in the soil at 42 days after transplant ing (DAT) were higher with increasing N and K rates. At harvest (86 DA T), only K concentrations had increased with N and K rates. Chemical n ame used: cyano (3-phenoxyphenyl) methyl 1-4 chloro-alpha-(1-methyleth yl benzeneacetate) (fenvalerate).