The influence of rate of seeding upon certain plant characters in barley
1937
Thayer, J.W. Jr | Rather, H.C.
Studies involving six rates of seeding were conducted with Spartan, Michigan-Two-Row, Glabron, and Wisconsin No. 38 barleys during the seasons of 1932 to 1934. The number of plants per unit area increased, but tillering, length of culm, length of head, number of kernels per head, and weight of 1,000 kernels decreased as the rate of seeding was increased from 1/2 to 3 bushels per acre. Because varieties differed in this rate of decrease for each character as well as in the characters themselves, there was some inherent difference in the optimum rate of seeding. The rate of seeding which gave maximum acre yields was not a single rate, but a rather wide range. For Glabron and Wisconsin No. 38 barley it was from 1 to 2 1/2 bushels per acre, for Michigan-Two-Row 1 1/2 to 2 1/2 and for Spartan 2 to 3 bushels per acre. An increase in rate of seeding beyond this optimum range caused so great a reduction in growth characteristics, particularly tillering, length of head, and number of kernels per head that acre yields were reduced. There also was an increased tendency for the grain seeded at the heavier rates to lodge. Growth factors were influenced markedly by seasonal environment, but the optimum rate of seeding, although varying somewhat with variety, appeared to be independent of environment.
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