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Hard seed in Korean lespedeza

Middleton, G.K.
Agronomy journal 1933 v.25 no.2 pp. 119-122
Kummerowia stipulacea, after-ripening, seed germination
Ten well-matured samples of Korean lespedeza seed were tested at monthly intervals from November 1931 through March 1932. The results show a rapid decrease in the hard-seed content and a corresponding increase in germination for each sample from November through January, but with very little further change by March. The average percentages of hard seed for November, January, and March were 47.25, 12.25, and 11.05, and the average percentages of germination for the same periods were 46.70, 83.30, and 84.85, respectively. The data show that, if satisfactory results are to be obtained, germination tests should be delayed at least until January following harvest. This conclusion is substantiated by reports on several hundred samples of seed tested during the past 3 years. The results of tests made in the fall of 1931 and in March 1932, on 30 samples of seed, show that when tests are made early in the season the total viable seed content (germination plus hard seed) is a more reliable guide to the agricultural value of the seed than is germination alone. For samples of well-matured, bright, plump seed, the deduction of 15% from this total, as determined in the fall, has proved a safe estimate of the actual germination obtained the following spring.