FURTHER STUDIES ON NITROGEN ABSORPTION FROM CULTURE SOLUTIONS

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Abstract
Measurements of the relative rates of the absorption of N in the form of NH4 and NOs from culture solutions throughout the life cycle of Fagopyrum esculentum were made. When N is present in the culture medium in the salts of the forms considered, the total N absorbed by the plants for a unit weight of dry plant material is determined during the early stages of growth by the absorption of NH4 and during the later stages of growth by the absorption of NO3. During the 1st half of the life cycle of the buckwheat plant, ammonium absorption predominates over nitrate absorption, and during the 2nd half of the life cycle nitrate absorption predominates over ammonium absorption, whether the N in the 2 forms is present simultaneously in the culture in equal proportions or in unequal proportions provided that there is no lack of either one for the needs of the plants. The max. rates of N absorption per unit weight of dry plant material occurs at the beginning of the growth cycle and the min. rate occurs at the end of the growth cycle. However, the max. rate of total N absorption per plant occurs during the reproductive phase, the rates gradually rising to this point and then gradually declining as the plant matures.

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