Fundamental study for diagnosis on nutrient status of tomatoes [Lycopersicon esculentum] cultured in hydroponics: Concentration of elements in leaves as influenced by nitrate feeding.
1994
He Y.Q. | Terabayashi S. | Namiki T.
The growth and concentration of elements in leaf blades and petioles of different leaf position and at different growth stage of two tomato varieties (Momotaro and TVR-2) cultured in the nutrient solution of four different nitrate concentration (2, 4, 8, 12 meq/l) were determined by sap analysis. In both varieties, the top weight at mature-green fruit stage of the first cluster was related to nitrate concentration of the petiole directly under the first cluster at fruit setting stage of the first cluster. In all the growth stage, there were no large effect of nitrate concentration in the nutrient solution on the concentration of K, Ca and Mg in the leaf. High nitrate concentration in the nutrient solution tended to decrease the concentration of Ca in leaf blade and petiole at mature-green fruit stage of the first cluster. Nitrate concentration of petiole was influenced by nitrate concentration in the nutrient solution more quickly than that of leaf blade, the difference being noticeable at the early stage of growth. compared with the nitrate concentration of petiole of lower leaves (below first cluster), that of young mature leaves (7-9 nodes from tip) were susceptible to the concentration of nitrate in nutrient solution. At the mature-green fruit stage of the fist cluster, however, nitrate concentration in young leaves fluctuated.
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