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• W1593822406 abstract "A field study was conducted at the Maricopa Agricultural Center to determine the effect of nitrogen fertility level on the effectiveness of PIX and defoliants for shortseason cotton production. Increasing the nitrogen fertility level from 90 lbs N/A to 240 lbs N/A increased lint yields from 2.23 to 3.14 bales /A, respectively, in a 157 -day growing season. FIX treatments did not promote earliness, and resulted in yield reductions. Increasing the application rates of Dropp from 0.1 to 0.2 lbs a.i. /A and Def -6 from 0.75 to 1.13 lbs a.i. /A resulted in increases in leaf drop. There was a significant linear decrease in the effectiveness of defoliants as the petiole NO3 N content increased from 850 to 2450 ppm. INTRODUCTION Recently, there has been interest in Arizona in the use of a short -seasonproduction system for cotton. The short -season system referred to here is a 135to 150 -day season with an approximate 15 August irrigation termination date. This production system has several advantages over a fullseason system such as: reduced irrigation and insecticide inputs; it can act as a method of population suppression of pink bollworm and other insects by reducing the overwintering generation and it can result in improved lint quality. The main disadvantage of the short -season system is that growers face a loss of yield from the elimination of the lateseason top crop. To offset this, the short -season crop should be managed to maximize the production of early bolls. One method of promoting earliness is through the use of growthregulating chemicals. Growth regulators have potential as a means of manipulating growth to increase the production of early bolls as well as controlling plant growth and reducing production inputs. Another area of concern for growers in the management of cotton for short-season production is defoliation. For short -season production, the crop must be defoliated in late August or early September when conditions are favorable for vegetative growth, and foliage is often very dense. Limited information is available concerning the management of nitrogen fertility to condition the cotton plant for defoliation, particularly for early termination. The objective of this research was to determine the effect of the nitrogen fertility level on effectiveness of PIX and defoliants for short -season cotton production. An important aspect of this work was to evaluate the use of petiole nitrate monitoring as a guide to defoliant selection and time of application. MATERIALS AND METHODS Seeds of the cultivar DPL 90 were planted on 7 April 1989 in moist soil at the Maricopa Agricultural Center. The plot area did not receive preplant N fertilizer. A crop of sweet sudan was grown without N fertilizer in the plot area in the summer of 1988 and removed from the field at the end of the season to lower the residual N content of the soil. The N treatments used were: 1) 90 lbs N /A, 2) 150 lbs N /A, and 3) 240 lbs N /A. The N fertilizer was sidedressed on plots on 20 April, 8 June, 21 June, 11 July and 25 July. Soil samples were collected before planting and after harvest to determine the residual N present. The nitrate content of cotton" @default.
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• W1593822406 date "1990-01-01" @default.
• W1593822406 modified "2023-09-23" @default.
• W1593822406 title "Effect of Plant Nitrogen Status on Effectiveness of Pix and Defoliants for Short-Season Cotton Production" @default.
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