A small portable sprayer was found to be the most practical for applying experimental herbicides for the control of lambkill (Kalmia angustifolia L.) in lowbush blueberry plots. The standard knapsack sprayer requires a large volume of rinse water to clean the sprayer between treatments and this frequently has to be transported a considerable distance to the spray site. In order to reduce the amount of rinse water to a minimum a knapsack sprayer was modified so that the spray solution for each treatment could be held in an individual disposable polyethylene bag.

The most economical time to control invading noxious shrubs is at an early stage in the invasion, when stands are sparse. One method of doing this is with a ground spray rig (Fig. 1). With such a rig the problem is to get the guns out from the vehicle so that a reasonable-sized swath can be covered. The out-rigger apparatus described herein can be used to cover a swath of 50 feet where the brush is fairly dense, to 90 feet on sparser stands.

Preliminary investigations were conducted to determine the feasibility of making band applications of solid materials (dust and granules) into the crop row.

The principle of the variable dosage or logarithmic sprayer was described first in 1955. Since that time at least two sprayers utilizing this principle have appeared. Certain limitations were, however, encountered in adapting these sprayers for small plot testing under field conditions.

Portability is a very important feature of a sprayer for experimental plots on rangeland. The rockiness of many sites and the height and density of many weed stands, such as species of Artemesia, Chrysothamnus, Linaria, Alhagi, and Centaurea, preclude use of push-type sprayers mounted on wheels. Ries and Terry discuss the use of a portable small-plot sprayer but the capacity of their sprayer is not adequate for many situations. Range weed control research is often combined with reseeding and fertilization studies, and a sprayer with considerable capacity is needed for large plots. Swath widths of at least 10 feet are desirable.

Although a number of physiological effects of amitrole (3–amino–1,2,4–triazole) on plants have been reported there appears to be nothing in the literature on its effect on germination and seedling development in cotton.

In a preliminary experiment young oat plants which grew in culture solution containing 0.05 ppmw of 2–chloro–4,6–bis (ethylamino)–s–triazine (simazine) for 60 hours were injured but not killed. The objective of the experiment reported here was to study the relations among (a) the concentration of simazine in the culture solution, (b) the concentration of simazine in the oat plant, and (c) the reduction in weight of plants following treatment.