. Development and activities of roots of crop plants; a study in crop ecology. Roots (Botany); Plant ecology; Crops and climate. Investigations at Peru, Nebraska. 21 Corn, Zea mays indentata. The corn plat was plowed April 4 to a depth of 4 inches and harrowed immediately afterward. It was harrowed again May 5 to keep it free from weeds, and on May 9 was planted with Iowa Silver Mine corn. This is a large, rather late maturing variety. Before planting, the plat was marked off in rows 3 feet apart and the seed was drilled along the marks without furrowing. The kernels were planted inches de
. Development and activities of roots of crop plants; a study in crop ecology. Roots (Botany); Plant ecology; Crops and climate. Investigations at Peru, Nebraska. 21 Corn, Zea mays indentata. The corn plat was plowed April 4 to a depth of 4 inches and harrowed immediately afterward. It was harrowed again May 5 to keep it free from weeds, and on May 9 was planted with Iowa Silver Mine corn. This is a large, rather late maturing variety. Before planting, the plat was marked off in rows 3 feet apart and the seed was drilled along the marks without furrowing. The kernels were planted inches deep and feet apart in the rows. That part of the plat in which the excavations were made was cultivated very shallow with a hoe so as not to disturb the roots. It was hoed three times, on May 31, June 16, and July 9, respectively. The first examination of the root system was made June 14, 36 days after planting. The height of the crop averaged from 10 to 14 inches and the seventh and eighth leaves were just unfolding. The stand was very uniform. In this early stage of growth it has a distinctive surface system of Fig. 7.—Root system of Iowa Silver Mine corn 36 days old. Of the several plants examined no root approximating the position of a tap- root was found. Whether originating from the hypocotyl or from a node above, the roots took a course parallel or almost parallel with the surface of the soil. In this manner they ran out in all directions from the points of origin. The number of roots varied from 10 to 15; they were about mm. in diameter, and ranged in length from to feet. They ended from to feet below the surface (fig. 7). Throughout their length, excepting the last 8 to 12 inches, all the roots were profusely branched and as many as 33 rootlets were counted on a single inch. The branches varied from a few millimeters to 4 inches in length and were themselves rebranched. *This period had been very favorable for plant growth. Although May
Size: 2820px × 886px
Photo credit: © Paul Fearn / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjectcropsan, bookyear1922
