The Journal of Horticultural Science & Biotechnology
Vol. 26 No: 2
Spacing Experments on Vegetables II. The Effect of the Thinning Distance on the Yields of Globe Beet, Long Beet, Carrots and Parsnips Grown at a Standard Inter-Row Distance In Cheshire, 1948
Precise data on the relation between plant density and yield seem to be wholly lacking for our common root vegetables. With these crops the problem is one of great complexity. Whereas with many farm crops it matters little if a large number of small plants make up the total yield, with most root vegetables extremely large or small roots are disposed of only with difficulty, or in times of acute shortage. Generally, therefore, the aim, is the maximum number and weight of intermediate sized plants. Weight alone is not always an adequate measure of yield. Some roots are sold bunched, when the number over a certain minimum size, rather than their weight, is the criterion of a satisfactory crop.
That an investigation of the effect of spacing on yield is long overdue is suggested by the diversity of thinning distances recommended in the literature. Commercial crops of carrots are usually not thinned (Hoare, 1945) but leaflets addressed to small growers suggest thinning distances of 4 in. or
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