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Cucumber (Cucumls sativus L.) and cantaloupe (Cucumis melo var. Cantaloupensis L.) seedlings have been subjected to a wide range of rhyzosphere pH. Each plant was grown in one pot in water culture. The results obtained showed a great influence of pH on plant root length, root diameter and number of roots, in addition to the subsequent effect on the vegetative growth. The experiment suggests the importance of rhyzospher pH to produce healthy cucumber and cantaloupe seedlings with the maximum root performance. Obtained date were discussed according to the prevailed microlimatic conditions.
An experiment was conducted to investigate the effect of using nitric acid, phosphoric acid and nitric: phosphoric 3:1 to adjust the pH in NFT solution on uptake and transport of phosphorus, zinc and manganese ions on cucumber (Cucumis sativus) plants cv. Farbiola. Phosphorus concentration was increased to about 450 ppm when phosphoric acid used to adjust the pH. Increasing phosphorus concentration in NFT solution did not increase % of phosphorus in the leaves, but increased it in the roots. As a result of increasing % of phosphorus in the root. Manganese and zinc transport were increased from the root to the leaves.
Cucumber plants )Cucumis sativa cv. Beta-al-pha) were grown in a glasshouse in pots of sand with 3 NaCl levels in the nutrient solution (0.40 and 60 mM) and placed in four large water baths controlled at different temperatures (13, 18,23, and 28°C). The increase of NaCl levels decreased the vegetative growth, seed yield, and seed quality, while the increase of root zone temperature up to 23C° increased the vegetative growth, seed yield and quality. Whereas, 28°C showed lower effect than 23°C. Ethylene production and the content of proline and free amino acids were increased with increasing NaCl levels. The increase of root zone temperature till 23°C decreased ethylene production, proline, and free amino acids contents. Zero NaCl (as control) obtained with 23°C root zone temperature appeared to be the best for the over-all growth, seed yield and seed quality of cucumber plants.
Jews' Mallow (Melokhia) Corchorus olitorus, is a very important leafy vegetable for the Egyptians all year round, except for winter period. Short days and low temperatures accelerate the flower initiation and inhibits the vegetative growth entirely. Some supplimentary light of 8000 lux for one or two hours after sun-set, or as a flash for 10 min. at mid-night have been tried. The obtained results showed that two hours of artificial light after sun set inhibits the flowering and encourages leaf number, leaf area, plant height, plant fresh and dry weight, and leaf/height ratio. The obtained data were discussed in relation to the prevailed microclimatic conditions.