ISHS Acta Horticulturae 434: Strategies for Market Oriented Greenhouse Production
EFFECT OF NITROGEN FORM ON LETTUCE PLANT GROWN IN HYDROPONIC SYSTEM |
| Authors: | E.M. Abd-Elmoniem, A.F. Abou-Hadid, M.Z. El-Shinawy, A.S. El-Beltagy, A.M. Eissa |
| Abstract:
The responses of grown lettuce plant to different nitrogen forms were evaluated under hydroponic system. Lettuce (Luctuca sativa L.) plants were grown in water culture having 4 nitrogen sources: (a) KNO3 and Ca (NO3)2, (b) NH4 NO3, (c) (NH4)2 SO4 or (d) CO(NH2)2. Growth, total nitrogen and nitrates in plants were determined. The NO3 - fed plant was somewhat greater in both fresh weight and nitrate content than other plants. In contrast, the NH4 - fed plants, showed lower nitrate content and fresh weight than the plants from corresponding three treatments. Total nitrogen content increased, according to applied N form, in the following order: Urea > ammonium sulphate > calcium and potassium nitrate > ammonium nitrate. These differences may be due to the variation in both of the uptake process and assimilation of nitrogen forms in the lettuce plants. | |
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