Influence of nitrate ions upon the growth of
Chrysanthemum coronarium var.
spatiosum was investigated by means of water culture, with special reference to dry matter production.
1) Absorption rate of nitrate ion and the juvenile growth of plants were almost independent of nitrate concentration of the medium. However, the maximal growth of plants was limited by the total amount of nitrogen available.
2) Nitrogen deficiency caused chlorosis, or chlorophyll content depression, in leaves, and accumulation of phosphorus in tissues, while it had no special effect on the content of ashes, calcium and iron.
3) Decrease of nitrogen concentration in tissues was persued at successive stages of growth. Critical nitrogen concentration in each organ, at which the growth should cease, was detected.
4) Marked recession of photosynthetic activity, and reduction of respiration in leaves and roots, but the increase of it in stems were observed being accompanied with nitrogen deficiency. Decrease of plant growth was also explained in the light of dry matter production.
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