ホテイアオイ(Eichhornia crassipes (Mart.) Solms)の生育及び繁殖に関する研究 : 第1報水中の栄養塩が生育及び繁殖に与える影響

概要

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The purpose of this fundamental experiments was to determine the effect of nutrients on the growth and reproduction of waterhyacinth. The results obtained were as follows : 1) Plants grown in each solution with N. P or Ca deficiency depressed the growth and reproduction. Chemical analysis revealed that phosphorus content of the aerial portions was low in all above mentioned treatments. 2) As the ammonium N levels was increased from 0 to 160ppm in culture solution, the growth of adult plant increased. While in young plant the maximum growth occured in the 40ppm ammonium N solution. Also they produced a greater number of new plants in the 40ppm and the growth of new plants was maximum in this treatment. These results indicated that the optimum growth differed from the optimum reproduction in the nitrogen requirements. 3) The effect of various levels of phosphorus and calcium on the growth and reproduction was investigated. Plants grew well in water with a phosphate level over than 20ppm. As the phosphate content of the water was increased from 0 to 40ppm, phosphorus content of the aerial portions in-creased. While in calcium oxide, the minimum threshold concentration that showed normal growth was 5ppm. Even when the content of the water was increased, calcium content of the plant was not increased except the treatment of 80ppm.
日本雑草学会の論文
1978-10-25