Archive image from page 75 of Development and activities of roots. Development and activities of roots of crop plants; a study in crop ecology . developmentactiv00weav Year: 1922 54 Development and Activities of Roots of Crop Plants. ditions also prevailed throughout July. Well-distributed rains furnished abundant soil-moisture (table 10); soil and air temperatures and humidity were favorable (fig. 20), and evaporation was not excessive (table 11). The roots on the upland had penetrated to a maximum depth of feet and were fairly abundant to the level. Those on the lowland were sl
Archive image from page 75 of Development and activities of roots. Development and activities of roots of crop plants; a study in crop ecology . developmentactiv00weav Year: 1922 54 Development and Activities of Roots of Crop Plants. ditions also prevailed throughout July. Well-distributed rains furnished abundant soil-moisture (table 10); soil and air temperatures and humidity were favorable (fig. 20), and evaporation was not excessive (table 11). The roots on the upland had penetrated to a maximum depth of feet and were fairly abundant to the level. Those on the lowland were slightly deeper. The greatest depth of penetration was feet and several occurred at the 5-foot level. In both areas the tap-root was the prominent A Ei Fig. 25.—A. Alfalfa 132 days old. B. Sweet clover 115 days old. feature, varying from 3 to 5 mm. in diameter. Laterals were not abundant below the surface foot of soil. The longest did not exceed 6 or 8 inches. The roots penetrated nearly vertically downward and were furnished at irreg- ular intervals with short, mostly poorly branched or unbranched rootlets. These occurred at intervals of an inch or less, becoming smaller near the
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