Browsing by Author "Morgan, N.G."
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Item C.B.D Spray Application Techniques(1969) Kearns, H.G.H.; Mapother, H.R.; Morgan, N.G.In all crop protection problems the proper application of the material is as important as the material itself. The target of shoot inter nodes for the control of Coffee Berry Disease is much more difficult to spray than many other targets. For example the leaf target for coffee rust control is relatively simple and good cover it must be stressed that because equipment can provide leaf cover for rust control it does not mean that it will necessarily give the required cover for Coffee berry Disease control.Item Spray Application(1970) Morgan, N.G.Experiments have been carried out in collaboration with the Coffee Research Station, Ruiru, Kenya on the redistribution of fungicides applied to the top portion of the trees, as might be expected from aircraft and from multi-row spraying by overhead boom, these application techniques being introduced to increase the speed of coffee spraying. The spraying and sampling was done by staff of the Coffee Research Station and the shoot, berry and leaf samples were sent by air to Long Ashton for estimation of the fungicide deposits by colorimetry and chromatography.Item Spray Application Problems: LXIX. Assessment of the Droplet Spectra of Spraying Equipment with the Flying Spot Particle Resolver(1963) Conibear, D.I.; Morgan, N.G.The measurement of droplet size is an important part of the assessment of the efficiency of crop-spraying and other droplet-generating equipment such as humidifiers. It is usually impossible to measure all the droplets produced by the equipment, and some form of sampling is necessary. 1Iedi3. for the sampling of aqueous drops include cells of oil in which the drops remain their spherical form, slides coated with a layer of magnesium oxide in which the impacting drops form circular depressions, and paper on which the drops of c. dye solution form individual stains. The last medium can also be used for oil drops, while the first two have the advantage that they can be used to collect a wide range of aqueous spray materials without the introduction of dyes. Sampling of the droplets in flight by photography is also possible. Until the recent introduction of automatic methods of counting and sizing, all these sampling methods have necessitated laborious and often inaccurate visual measurement by calibrated microscopes or projection apparatus. A critical review has been made by Furmidge (1) of the reliability and accuracy of a flying spot panicle resolver for the automatic measurement of the stains made by spray droplets of a nigrosine dye solution on fixed and glazed photographic paper. He found that the 3peed and reliability of this method were considerably greater than could be achieved by visual microscopic measurement and, given a reasonably skilled operator and suitable stain samples, the counting and sizing accuracy was also greater.Item Spray Application Problems: LXXV the Production of Small Spray Droplets with Experimental High Speed Air-Shear Equipment.(1966) Morgan, N.G.; Russell. J.H.; Long Ashton Research StationAn important aspect of crop protection spraying, particularly with small volumes of liquid, is the size of the spray droplets used and therefore the number available for distribution on the crop. This number increases rapidly with reduction of the diameter of the droplets from a given volume of liquid. Therefore a method is required for breaking the spray into the smallest droplets that can be deposited on the crop in sufficient number to provide effective cover.
