Studies of growth in rice
1936
Adair, C.R.
The plants began to tiller about 3 weeks after seeding, and by the end of the sixth week all tillers that were to form panicles had started growth. The number of leaves per culm increased slowly until panicles were formed and then remained constant. Increase in plant height was relatively rapid the first 6 weeks after seeding, then it was slow for about 2 weeks, followed by a rapid increase until flowering time, after which there was little increase. The 2 weeks of slow growth were probably due to root injury by maggots. The increase in plant weight was slow for the first 5 weeks, after which tillers became established and, for a short time, owing to the activity of tiller roots, the weight increased rapidly. The rate of increase was then somewhat slower for about 2 weeks, after which, during the jointing stage, there was a rapid increase in weight. The weight of the panicles increased until maturity, but that of the culms, after flowering, decreased slightly. There was an early inflection of the height and weight curves in 1934. This was attributed to adverse weather conditions Each variety attained a greater height and weight of plant in 1933 than in 1932 and 1934. In these studies little significance could be attached to the values of A/K and K/A from the growth equation Log: X/A-X = K (t-t1).
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