. Proceedings of the American Society of Agronomy . ^ digging a deep trench on two sides (PI. IFig. i) and tunneling under at the proper depth. The blocks wereallowed to remain in contact with the adjacent soil on two sides untila heavy plate of galvanized iron had been inserted under the soil andsecurely supported by means of a cement concrete pier. The blocks * Briggs, L. J., and McCall, A. G. An artificial root for inducing capillarymovement of soil moisture. Science, n. ser. 20: 566-569. 1904. Plate Fig. 2.—Galvanized iron tanks (without bottoms) ready to slip down over the blocks of s
. Proceedings of the American Society of Agronomy . ^ digging a deep trench on two sides (PI. IFig. i) and tunneling under at the proper depth. The blocks wereallowed to remain in contact with the adjacent soil on two sides untila heavy plate of galvanized iron had been inserted under the soil andsecurely supported by means of a cement concrete pier. The blocks * Briggs, L. J., and McCall, A. G. An artificial root for inducing capillarymovement of soil moisture. Science, n. ser. 20: 566-569. 1904. Plate Fig. 2.—Galvanized iron tanks (without bottoms) ready to slip down over the blocks of
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