. The book of wheat : an economic history and practical manual of the wheat industry. itions for plant growth, and the thinner theAvheat is on the ground, the more it weather during early development may re-sult in a long period of subsequent giowthAvhich encourages tillering. Time of seeding,also has great influence, for late sown wheatmay not have time to stool. The habit variesquite materially in different varieties. Whilethinner sown wheat may tiller more, a greateramount of seed per acre often increases the t1h>i^UmsarTfrfmiyield, even though there are fewer stools. ^/Yi^g
. The book of wheat : an economic history and practical manual of the wheat industry. itions for plant growth, and the thinner theAvheat is on the ground, the more it weather during early development may re-sult in a long period of subsequent giowthAvhich encourages tillering. Time of seeding,also has great influence, for late sown wheatmay not have time to stool. The habit variesquite materially in different varieties. Whilethinner sown wheat may tiller more, a greateramount of seed per acre often increases the t1h>i^UmsarTfrfmiyield, even though there are fewer stools. ^/Yi^gie seed origi-Pliny is said to have declared that it was notuncommon in northern Africa and in Italy to find from 200 to400 stalks of wheat growing fiom a single kernel. Humboldtput on record that in Mexico each grain of wheat produced 40to 70 stalks. It is probable that each of these men was seeingwith the eyes of an enthusiast. The Growth of a Wheat Plant is the aggregate result of theenlargement and multiplication of the cells which comprise Kept. N. D. Sta., 1001, p. 18 THE BOOK OF WHEAT Generally cells reach their full size in a brief time, and con-tinuous growth depends mainly upon the constant and rapidformation of new cells. The essentials to growth are light,air, moisture, heat and food. In the absence of any one ofthese, the plant dies, and in their disproportionate combina-tion, growth is sickly. In germination, food is furnished bythe seed, and light is not essential. Over light man has nocontrol. He can increase the amount of air that has access tothe plant by loosening the soil around its roots. An adaptivecontrol of heat is exeicised by sowing during the wann selecting soils, fertilizing and changing existing foods fromunavailable to available forms, food can in a great measure beregulated, and water, acting as a solvent and vehicle, can bevery largely regulated as to amount by drainage and the growth and multiplication of cel
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