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Effect of Ryzup Plant Growth Regulator on Lint Yield and Plant Development

Kater Hake, Koy Stair


The highly variable production conditions on the Texas High Plains dictate that producers utilize varieties with a high degree of plasticity (intermediate in determinancy), and manage the plant to optimize growth for the ensuing weather and pest complex in each year. Desiccating winds often severely retard early season vegetative growth in this region. The plant growth regulator RyzUp, from Abbott Laboratories was evaluated for any impact on plant growth and yield, following a spring with sustained high winds and stunted plant growth. At two irrigated locations with the most prevalent cotton variety Paymaster HS26 RyzUp was applied to seedling cotton at the 5 and 7 leaf stage at 1, 2 and 3 g a.i. of GA3 per treated acre (1, 2 and 3 oz of formulated product). RyzUp increase leaf area, plant height and lint yield when compared to the untreated check or the Pix treated check. This product appears to offer a low cost (ca. $2/acre when band applied) method to stimulate leaf size. Whether larger leaves is a benefit or detriment will depend on the growing conditions and each year. Early applications, at 5 true leaf, offered greater advantage than later, 7 true leaf applications

Reprinted from Proceedings of the 1996 Beltwide Cotton Conferences pp. 1152 - 1153
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998