Evaluation of a Feedback Vs. Scheduled Approach to Pix Application

D.C. Fletcher, J.C. Silvertooth, E.R. Norton, B.L. Unruh, E.A. Lewis


 
ABSTRACT

Two field experiments were conducted in 1993 in Arizona to compare a scheduled approach (based on stage of growth) versus a feedback approach (based on vegetative status) to mepiquat chloride (PIX(TM)) applications on Upland cotton (Gossypium hirsutum L.). PIX feedback treatments received no PIX applications due to plants lacking vegetative tendencies based upon height:node ratios (HNRs) and established baselines. Scheduled PIX applications ranged from 0.5pt./acre to 0.75 pt./acre, and were applied at early bloom (approx. 1500 heat units after planting (HUAP), 86/55°F threshold) and post early bloom (approx. 2000 HUAP). PIX treatments did consistently reduce plant heights compared to an untreated check. Statistically significant differences (P<0.05) in lint yield were observed among the treatments (feedback vs. scheduled)at the Safford location only. Evidence from these studies do reinforce the use of a feedback approach from the standpoint of conserving inputs and maintaining optimum growth control.



Reprinted from Proceedings of the 1994 Beltwide Cotton Conferences pp. 1259 - 1262
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998