. Bulletin of the Department of Agriculture. Agriculture; Agriculture. BULLETIN OF THE "ffiOFAfflU No. 228 Contribution from the Bureau of Plant Industry, Wm. A. Taylor, Chief May 22, 1915. (PROFESSIONAL PAPER.). EFFECT OF FREQUENT CUTTING ON THE WATER REQUIRE- MENT OF ALFALFA AND ITS BEARING ON By Lyman J. Briggs, Biophysicist in Charge of Biophysical Investigations, and H. L. Shantz, Physiologist, Office of Alkali and Drought Resistant Plant Investigations. INTRODUCTION. The determination of a plant's efficiency in the use of water at different stages in its development
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. BULLETIN OF THE "ffiOFAfflU No. 228 Contribution from the Bureau of Plant Industry, Wm. A. Taylor, Chief May 22, 1915. (PROFESSIONAL PAPER.). EFFECT OF FREQUENT CUTTING ON THE WATER REQUIRE- MENT OF ALFALFA AND ITS BEARING ON By Lyman J. Briggs, Biophysicist in Charge of Biophysical Investigations, and H. L. Shantz, Physiologist, Office of Alkali and Drought Resistant Plant Investigations. INTRODUCTION. The determination of a plant's efficiency in the use of water at different stages in its development is a problem of much interest, but one which involves serious experimental difficulties on account of the constantly changing environmental conditions and the con- sequent necessity of extensive multiplication of the series of experi- mental plants. The present experiments (Table I) were designed to determine (1) whether alfalfa in the early stages of growth following a cutting has a water requirement differing from the water require- ment of the plant during the normal period of growth, and (2) to what extent frequent cutting or grazing during the hottest part of the year modifies the seasonal water requirement. METHOD. Two standard sets of selected Grimm alfalfa,2 each consisting of six pots of plants, were employed in these experiments. The plants were treated in the usual way3 up to the time of the first cutting, on July 26, at which time care was taken to leave the basal shoots, so as to insure the uninterrupted growth of the plants. Following this date, the growth on the pots of series B was cut back weekly in a manner somewhat resembling pasturage (fig. 1), all of the material thus removed from each pot being preserved separately. The growth of the plants in series A was allowed to proceed without interruption 1 The experiments reported in this bulletin were conducted at Akron, Colo., in 1912. The methods employed were essentially the same as those described in Bulletin
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