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- Author or Editor: Ismail M. Dweikat x
Abstract
Two field studies were conducted in Fall 1982 and Spring 1983 to evaluate two row arrangements (single vs. double rows per bed), four within-row plant spacings (0.30, 0.45, 0.60, and 0.75 m), and three N rates for zucchini squash (Cucurbita pepo var. melopepo L.) grown on sandy soils. Rates of 67, 134, and 202 kg N/ha were used in the fall, while 134, 202, and 268 kg N/ha were used in spring to determine the optimum levels of N for the higher population densities. Early and total marketable yields were higher with double rows in the spring experiment. Decreasing in-row plant spacing from 0.75 to 0.30 m increased total yield in both experiments, but decreased early yield in the fall experiment. Total yields increased as the N rate increased from 67 to 202 kg·ha-1, but then decreased at 268 kg·ha-1. Combinations of row arrangements and within-row plant spacings allowed testing of seven populations ranging from 11,111 to 55,556 plants/ha. The overall response of yield to increasing plant densities was linear in the fall, but quadratic in the spring, when the higher rates of N were used.