SIMPLIFIED EQUIPMENT FOR SUBIRRIGATION EXPERIMENTS IN PLANT NUTRITION

The two well known techniques which are used in plant-nutrition studies are conveniently designated the solution-culture method and the sand-culture method. Some other slightly soluble materials, such as cinders, gravel, vermiculite, and Sponge Rok or various combinations of these may be substituted for sand. The use of slightly soluble material as a medium, to which the nutrient solution is properly added, has certain advantages over the strictly solution-culture method. Good aeration and anchorage are provided in the sand-culture technique. It is the present purpose to describe simplified equipment for subirrigation experiments in plant nutrition. This equipment can be assembled from miscellaneous materials at a minimum cost. Tin containers (fig. 1) properly selected as to size, shape and volume, so that one (A) can be superimposed above the other (F), thus makilng a two-compartment container, are desira-