| Abstrakt: |
The experiment was conducted to evaluate growth, yield and chemical compositions of lettuce cultivar fire red under different culture systems hydroponic, aeroponic and sandy substrate. This experiment was conducted at the greenhouses of vegetable crops department, faculty of agriculture, Cairo University, Giza, Egypt. The systems were constructed at controlled experimental fiberglass greenhouse. The number of leaves was highest in hydroponic system compared with in aeroponic and sandy substrate systems after 2, 4 and 6 weeks of transplanting. On the other hand, the aeroponic system produced the tallest lettuce plants after 4 and 6 weeks of transplanting. Also, the aeroponic plants root length exceeded significantly roots length at the other culture systems. The root length of aeroponic was higher than the sandy substrate and hydroponic with 67.5 and 62.0%, respectively. Hydroponic system produced the highest shoots fresh weight and yield. The yield of hydroponic system has risen 2.51 fold than the yield of sandy substrate. While the raise in yield of aerponic system in compared with the yield of sandy substrate reached to 2.30 fold. Roots fresh and dry weight in aeroponic was the highest among all systems. Sandy substrate recorded the highest plant dry matter after 6 weeks of transplanting. On the contrary, the sandy substrate recorded the lowest N, P and K % compared with aeroponic and Hydroponic systems while the highest N, P and K % was at lettuce in hydroponic system. [ABSTRACT FROM AUTHOR] |
