PGR-IV Responses to Upland and Pima Cottons in the San Joaquin Valley of California

B. Weir, D. Munk, R. Vargas, and S. Wrighy


 
ABSTRACT

Eight field tests were conducted in the San Joaquin Valley of California to evaluate the effect of PGR-IV on upland (Gossypium hirustum) and pima (Gossypium barbardense) cottons. Six of the tests included PGR-IV treatments at planting, and foliar applications, with and without pix. Two tests measured response to various rates of PGR-IV applied at pin head square and at first bloom. All tests were field scale in size and were conducted in plots of either eight 30-inch rows, or six 38-inch rows, replicated four times.

Leaf petiole samples were collected three times during the growing season and analyzed for nitrate nitrogen, phosphate phosphorus, and potassium. Plant monitoring was conducted at three stages of growth to determine effects on fruit set and retention. Plots were harvested for yields and lint samples were analyzed for fiber quality.

Treatments made no significant differences in petiole N, P, or K levels. Plant monitoring revealed a trend toward better boll retention and a significant improvement in the height to node ratio.

A positive lint yield response was measured from treatments which received PGR-IV at planting, at first square and at early bloom. The two treatments which included Pix applications significantly outyielded an untreated control. When 8 ounces of Pix was applied 10 days after squaring to PGR-IV treatments; at planting, first square, and early bloom, there was a 97 pound lint increase. Pix alone at early bloom yielded 68 pounds more than the untreated control.



Reprinted from 1995 Proceedings Beltwide Cotton Conference pg. 577
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998