. Journal of Agricultural Research. , at which time the plants were , the stalks were spindling and the leaves narrow, whereas theplants of the first set had stout stalks and the broad leaves of normalplants of that age. As the plants were cut, they were weighed for com-parison with those of subsequent series and found to average 44 weight expresses more accurately than does height the rate ofgrowth and health of the plant (7). Either one or two plants, depending on their size, were taken for eachsample and the stalks and leaves expressed together. Unfortunately,there was n
. Journal of Agricultural Research. , at which time the plants were , the stalks were spindling and the leaves narrow, whereas theplants of the first set had stout stalks and the broad leaves of normalplants of that age. As the plants were cut, they were weighed for com-parison with those of subsequent series and found to average 44 weight expresses more accurately than does height the rate ofgrowth and health of the plant (7). Either one or two plants, depending on their size, were taken for eachsample and the stalks and leaves expressed together. Unfortunately,there was not sufficient material to make duplicate measurements onstrains 326 and 113, and the plants of No. 485 and 350 were lost. Theacidity determinations for this group of plants are recorded in Table II. 60096—23 3 460 Journal of Agricultural Research Vol. XXV, No. II Table II.—Acidity of the tops of corn plants of Series II, 27 io 44 days old, in poor con-dition, grown in the greenhouse in slightly acid sandy clay loam * Strain Measurements in parentheses are not included in the averages because they were made on exceptionallypoor spindling plants, not typical of the row. The outstanding feature of Table II is the high acidity of all the plantscompared with the more vigorous ones of Table I. Additional evidenceof an interrelationship of acidity and vigor of growth was afforded bythe notes on relative development of some of the individual plants con-stituting the group. Some highly acid plants of 507 and 129, the meas-urements of which are inclosed in parentheses in the table and not aver-aged because the plants did not seem typical of the strains, were described,respectively, as spindling stalk, narrow leaves, tips dying, and shortand spindling, poorest of all. Of the uniformly highly acid strains,No. 150 showed a tendency to become diseased in all the plantings, whileNo. 113 was nearly always at the bottom of the list in vigor. SERIES III To check the results given in Tab
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