. Proceedings of the American Society of Agronomy . Fig. 43.—Method of arranging cans at the Montana Station. temperature of the surrounding soil. A heavy cable was stretchedover the line of cans, and weighing was done by attaching to a weigh-. Fig. 44.—Weighing cans at Montana Experiment Station. MONTGOMERY: WATER REQUIREMENTS OF CROPS. 269 masters beam and raising by block and tackle. Fig. 44 shows one ofthese cans being weighed. A great many tub experiments and canexperiments have been made, both in Europe and in America, usingapparatus similar to that just described. In most of these exper
. Proceedings of the American Society of Agronomy . Fig. 43.—Method of arranging cans at the Montana Station. temperature of the surrounding soil. A heavy cable was stretchedover the line of cans, and weighing was done by attaching to a weigh-. Fig. 44.—Weighing cans at Montana Experiment Station. MONTGOMERY: WATER REQUIREMENTS OF CROPS. 269 masters beam and raising by block and tackle. Fig. 44 shows one ofthese cans being weighed. A great many tub experiments and canexperiments have been made, both in Europe and in America, usingapparatus similar to that just described. In most of these experi-ments no attempt was made to prevent evaporation from the surfaceof the soil, and in some cases this was very large, amounting to per-haps twice as much as the water used by the plant. Table II showssome data from Bulletin 38 of the Montana Experiment Station indi-cating the amount of water lost by evaporation and the amountutilized by the crop. Only 12 to 31 percent of the water added wasutilized by the crop, the rest being lost presumably by evaporationfrom the surface. Table II.—Proportion of Water Used By the Crop in Open Cans. Results byFortier. {Montana Experiment Station, Bui. No. 38.) Number of Tank 4. Wheat 10. Check can.
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