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The 1985 and 1986 Cotton Reports have the same publication and P-Series numbers. / When DPL-90 was exposed to average daily temperatures above 78 °F, the plants were delayed in the location of the first fruiting branch and produced squares which had 4-bracts. At temperatures below 78 °F, there were very few 4-bract squares produced.

The 1985 and 1986 Cotton Reports have the same publication and P-Series numbers. / Seed cotton yields were increased an average 80% by a near doubling of the carbon dioxide concentration (approximately 650 ppm) in 3 years of experiments using CO₂-enriched, open-top chambers on field-grown cotton. Water use was not changed much or in a consistent direction, so water use efficiency increased in step with the dramatic yield increase.

The 1985 and 1986 Cotton Reports have the same publication and P-Series numbers. / PIX application on June 24 to high flowering rate cotton suppressed growth to an average .3 inch per day compared to .85 inch for untreated cotton during the period from July 2 to July 15. Treatment of DPL 90 cotton with a flowering rate of 5 flowers per 25 feet of row held growth to .38 inch per day versus 25 flowers per 25 feet of row also increased small boll numbers by July 15, or 21 days after treatment, over untreated cotton. Treatment of cotton with flowering rate of 5 flowers per 25 feet of row increased small boll numbers by July 29 or 35 days after treatment.

The 1985 and 1986 Cotton Reports have the same publication and P-Series numbers. / An experiment was conducted to test the hypothesis that a nutritional stress (shortage of photosynthate) affects the hormonal balance in bolls and their abscission zones. It did. The concentration of indoleacetic acid (IAA) in abscission zones of young bolls decreased and boll shedding increased as competition for photosynthate increased. Water deficit also decreased the IAA content of young bolls and their abscission zones, but greatly increased the concentration of abscisic acid (ABA) a hormone that may increase boll shedding.

The 1985 and 1986 Cotton Reports have the same publication and P-Series numbers. / PIX was applied on 6 varieties of cotton in 1984 and on 4 varieties in 1985. Application rates of 1/2 pt/ac, a split application of 1/2 pt + 1/2 pt and a single application of 1 pt/ac were evaluated. Different varieties were affected differently, but yield was depressed on all varieties by the split rate in 1984 and increased on all varieties by the single application of 1 pt/ac in 1985. Plant heights were reduced by all applications.

The 1985 and 1986 Cotton Reports have the same publication and P-Series numbers. / Four different treatments of PIX were evaluated with and without PREP on short staple cotton on two locations in the southern part of Graham county above the 4000 foot level. PIX caused significant decreases in plant height. The effect of the PIX treatments on yield, even though not significant, varied with the robustness of the cotton plants. PREP caused significant increases in maturity with no changes in yield on both locations.

The 1985 and 1986 Cotton Reports have the same publication and P-Series numbers. / Use of a September 13 application of Prep reduced squares 88 percent and 3/4 inch to 7/8 inch diameter bolls 33 percent as available host material for boll weevils and pink bollworms. Approximately 50 percent of retained bolls increased in size by October 15. This treatment permitted single-harvest by October 3 with a loss of 64 pounds of lint per acre when compared to traditional double harvest. Value of yield difference was approximately equal to the cost of second machine harvest.

The 1985 and 1986 Cotton Reports have the same publication and P-Series numbers. / An experiment was conducted at the Maricopa Agricultural Experiment Center to evaluate Burstᴿ, a cytokinin based plant growth regulator, on the growth, development and productivity of DPL-61. Six treatments were included in the experiment which varied application timing and frequency. No significant differences in yield were observed.

The 1985 and 1986 Cotton Reports have the same publication and P-Series numbers. / Plant growth substances and fertilizers from BioHumaNeticsᴿ were evaluated under field conditions on DPL 61 at the University of Arizona Maricopa Agricultural Center in 1985. Treatments included: 1)standard fertilization recommended for the farm, 2)no added fertilizers and 3)a treatment schedule prescribed by BioHumaNetics. No statistically significant differences were detected.