An Experimental Study of Certain Neonicotinoid Insecticides on the Incidence of Early Infestation of the Spiny and the American Bollworms, Growth and Lint Yield Characteristics of Cotton Plants

Field experiments were performed in 2 successive seasons at the experimental station, Faculty of Agriculture, Cairo University, Giza, Egypt, on the Egyptian cotton cultivar Giza 75 (Gossypium barbadense L.). Cotton plants were sprayed with the growth regulator 1-naphthaleneacetic acid (NAA) once (after 90 days), twice (90 and 105 days), or 3 times (90, 105, and 120 days after sowing), during the square initiation and bolling stage, at concentrations of 5, 10, 15, 20 or 25 mg/L, respectively. The volume of solution was the same for all treatments, 960 L/ha. The control plants were sprayed with water only. The effect of the previous treatments on yield components, lint yield, and fibre properties was studied. The application of NAA increased the number of opened bolls per plant, boll weight, seed index, and lint yield per ha. Lint percentage, fibre length parameters, and micronaire value were not significantly affected by NAA. Flat bundle strength was significantly increased when NAA was applied once at 10-25 mg/L. The application of NAA twice or 3 times at 15-20 mg/L tended to give the best results on yield components and lint yield of the Egyptian cotton plants.

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Effect of Consecutive Annual Applications of Fluometuron on Cotton (Gossypium hirsutum)

Weed Science ◽

10.1017/s0043174500025960 ◽

1981 ◽

Vol 29 (1) ◽

pp. 120-123 ◽

Cited By ~ 6

Author(s):

R. M. Hayes ◽

P. E. Hoskinson ◽

J. R. Overton ◽

L. S. Jeffery

Keyword(s):

Organic Matter ◽

Plant Growth ◽

Gossypium Hirsutum ◽

Fiber Length ◽

Fiber Development ◽

Lint Yield ◽

Silt Loam ◽

Cotton Yield ◽

Cotton Plants

Cotton [Gossypium hirsutum(L.) ‘Hancock’] lint yield or quality was not adversely affected under weed free conditions by three consecutive annual preemergence applications of up to 1.68 kg/ha fluometuron [1,1-dimethyl-3-(a,a,a-trifluoro-m-tolyl)urea] alone or in combination with 0.84 kg/ha trifluralin (a,a,a-trifluoro-2,6-dinitro-N,N-dipropyl-p-toluidine) preplant incorporated on silt loam soils of the Memphis catena containing less than 1% organic matter. Similar applications of fluometuron at 3.36 kg/ha delayed maturity of cotton plants and ultimately reduced lint yields. Trifluralin treatments tended to overcome the detrimental effects of high rates of fluometuron. There was no effect on fiber development and maturation because fiber length and fineness (micronaire) were virtually identical for all treatments. The effect on maturity as determined by percent first harvest was a reflection of slower plant growth and fruiting and not of the development of the fiber itself. These results indicate no detrimental effects on cotton yield, maturity, and quality from annual applications of these herbicides at rates recommended and normally used in Tennessee.

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Experimental study on the restoration from a tilt-azimuth series for improvement in resolution

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s042482010013955x ◽

1995 ◽

Vol 53 ◽

pp. 636-637

Author(s):

Norio Baba ◽

Norihiko Ichise ◽

Syunya Watanabe

Keyword(s):

Experimental Study ◽

Spherical Aberration ◽

Incident Beam ◽

Optical Parameters ◽

Beam Tilting ◽

Illumination Method ◽

Restoration Method ◽

Illumination Mode

The tilted beam illumination method is used to improve the resolution comparing with the axial illumination mode. Using this advantage, a restoration method of several tilted beam images covering the full azimuthal range was proposed by Saxton, and experimentally examined. To make this technique more reliable it seems that some practical problems still remain. In this report the restoration was attempted and the problems were considered. In our study, four problems were pointed out for the experiment of the restoration. (1) Accurate beam tilt adjustment to fit the incident beam to the coma-free axis for the symmetrical beam tilting over the full azimuthal range. (2) Accurate measurements of the optical parameters which are necessary to design the restoration filter. Even if the spherical aberration coefficient Cs is known with accuracy and the axial astigmatism is sufficiently compensated, at least the defocus value must be measured. (3) Accurate alignment of the tilt-azimuth series images.

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