窒素施肥量の差異がオモダカ(Sagittaria trifolia L.)の生育および繁殖体の生産に及ぼす影響

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Sagittaria trifolia L., a perennial paddy weed, was studied to obtain its life history for control of this weed. Experiment was carried out for the effects of various levels of nitrogen fertilization on the growth and production of propagules, being applied at O, 8, 16 and 32kg N/10a. 1) The growth both in natural plant height and the number of arrow-shaped leaves increased as level of the fertilizer increased. 2) The plants fertilized at 32kg N/10a emerged inflorescences and flowered later than those at lower nitrogen levels. 3) The number of fruits increased with the increase of nitrogen level, but the plants fertilized at 16 kg N/10 a produced the fruits which showed the highest 100 kernel weight, i. e. 57.6mg. 4) Nitrogen increased the production of tubers in number and the total fresh weight per plant, and conversely decreased both dry weight and percent dry matter of a tuber. 5) The production ratio of seed to tuber, in weight, increased with increase of nitrogen level.
1979-08-25