Ferguson, Ryker, and E.D. Ballard. 1975. Portable oscilloscope technique for detecting dormancy in nursery stock. USDA Forest Service Gen. Tech. Rept. INT-26. Ogden, Utah. 16 p.
The proper timing for lifting nursery-grown planting stock is an important factor in the ultimate success of revegetation efforts. This report describes a portable oscilloscope technique used to determine the level of activity or dormancy of nursery stock and plants in the field. The equipment includes a battery-powered oscilloscope and square wave signal generator, both commercially available, and a specialized electrode that must be constructed. A variety of plant species, including conifers and deciduous trees and shrubs, were monitored during all seasons of the year. Oscilloscopic wave form appeared to be related to periods of plant dormancy and activity. Certain similarities in wave form-seasonal relations were observed in related groups of plant species. The report describes the equipment used in detail, and suggests several potential uses to nurserymen and research workers.
Woogerd, S.M. 1976. Agricultural spray adjuvants. Agrichemical Age 19(7): 20-21,23.
A few years ago, the discovery that spectacular improvement in the performance of many foliage-applied herbicides was possible when certain surfactants were included in the spray solution, firmly established at least one role of the agricultural spray adjuvant in improving the efficiency of pesticide chemicals. Since then, we have been besieged by a whole gamut of surfactants and other additives, of varying effectiveness, from which to choose the proper product for a particular application. It is from this mass of confusion over what surfactants are, what adjuvants are, and which one to use and where, that we must try to provide some order and understanding. It is particularly timely now with avid public interest in and federal scrutiny of chemical usage and its relationship with the environment, to improve our efficiency in the use of agricultural chemicals.
- © 1977, International Society of Arboriculture. All rights reserved.