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Mineral Nutrient Uptake and Transport in Various Combination Grafting of Tomato (Lycopersicon esculentum Mill.) Plant.
The objectives of this study were to find the effects of different eggplant stocks on the mineral nutrient uptake and transport in various graft combination with tomato plants. The results indicated that an inadequate calcium supply in a closed hydroponic system in which cultivars of ‘Know-You 301’、‘Tainan ASVEG No.6’and ‘Ship Saint’ were grown and caused symptoms of calcium deficiencies. The symptoms included the soft and transparent root tip, the yellowing of leaf and then outward curling of leaves. . In the most serious cases, necrosis and curling of leaf margin, root browning, tip burn, blossom end rot, dieback or drying to death were observed. Changes in calcium content showed that the‘VF’ stock had a better ability to absorb calcium, and thus a better tolerance of calcium stress. Similar results were found in plants with different combination of stocks and scions in the field. The grafting of ‘Tainan ASVEG No. 6’ onto ‘VF’ had higher calcium content in roots, lower and upper leaves and new shoots than those on the ‘EG203’ stock. This indicated that ‘VF’ has a better calcium transport capacity but results varied with different kind of scions.
Foliar applications of 0.05 M calcium lactate plus surfactant “Break-Thru” to scions of ‘Know-You 301’, and ‘Ship Saint’ and found that ‘Know-You 301’ grafted onto ‘VF’ had higher calcium concentrations in its lower leaves. No significant difference was found with the rest of the graft combinations. However, ‘Ship Saint’ tomatoes after similar calcium treatment had lower calcium levels found in the plants. Foliar application of calcium was incapable of enhancing the calcium content of leaves and fruits.
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