Fruiting Efficiency in Cotton: Boll Set Percentage and Boll Size

Johnie N. Jenkins, Jack C. McCarty, Jr., and W.L. Parrott


We grew 8 cultivars of cotton for two years and mapped where the harvestable bolls were produced on the plant by fruiting site. We also measured fiber properties by fruiting site. Most of the bolls were produced at fruiting position one in each cultivar. With yields of about 1000 pounds of lint per acre we found that the maximum boll set at any fruiting site was 48% at node 12 position one. We present yield values from each fruiting site on the plant as means of 8 cultivars. The modern cultivars as exemplified by 'DES 119' and 'Deltapine 20' produced more harvestable bolls at lower nodes than the older cultivar 'Stoneville 213'. This increase in earliness calls for a different crop management strategy than used with Stoneville 213. Bolls from position one were 14% larger than bolls from position two and 21% larger than bolls from position three. Lint from bolls at position one had higher micronaire than those from positions two or three. Lint from bolls at position one was slightly longer than lint from bolls at position two. Fiber strength was only slightly stronger from bolls at position one compared to position two.

Reprinted from 1990 Proceedings: Beltwide Cotton Production Research Conferences pg. 88
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998