The effects of various equidistant plant spacings, rate of N and harvest date on the yield and maturity of single-harvested broccoli ( Brassica oleracea L. var. italica Plenck) were investigated during 3 successive cropping seasons. Plant population had only a slight effect on marketable yield. Spear wt decreased and crop maturity was delayed as plant population increased. Yields were increased and maturity was slightly delayed by N top-dressing. The optimum period for single-harvest extended over 3 to 4 days and began when about 11% of the spears were over-mature.
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J. A. Cutcliffe (1971) studied this question.
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