. Proceedings of the American Society of Agronomy . Fig. 2.—Series of cans used at the Nebraska Experiment Station i n determin-ing water requirements of maize plants. MONTGOMERY: WATER REQUIREMENTS OF CROPS. 20/ and a derrick fixed for weighing occasionally. Water was added asneeded. In his later experiments he made cans 42 inches deep, out ofgalvanized iron, and had a 4-inch tile placed inside of each and ex-tending to the bottom, through which the water was added as adopted the plan of watering the plants from the bottom by theuse of a tile, because he found in adding water from t
. Proceedings of the American Society of Agronomy . Fig. 2.—Series of cans used at the Nebraska Experiment Station i n determin-ing water requirements of maize plants. MONTGOMERY: WATER REQUIREMENTS OF CROPS. 20/ and a derrick fixed for weighing occasionally. Water was added asneeded. In his later experiments he made cans 42 inches deep, out ofgalvanized iron, and had a 4-inch tile placed inside of each and ex-tending to the bottom, through which the water was added as adopted the plan of watering the plants from the bottom by theuse of a tile, because he found in adding water from the surface a. Fig. 42.—Apparatus used by King in Wisconsin in making water determinations. very large percent was lost by evaporation. Plate III, Fig. 2, illus-trates a series of large cans at the Nebraska Experiment largest ones are 36 inches deep and 30 inches in diameter, holding1,000 pounds of dry soil, or about 1,400 when saturated to the opti-mum water content. Fig. 43 illustrates a method used first at the Utah Experiment Sta-tion and later at the ^Montana Experiment Station. The cans were36 inches deep and set in the ground so that the top of the can waslevel with the surface. However, a tub was first placed in the bottom 268 PROCEEDINGS OF TH-E AMERICAN SOCIETY OF AGRONOMY. of each hole and partly filled with water, with the idea that by sur-rounding the soil can by water it would be kept near the normal
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