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The effect of training loading and their interaction on the macroelement content in grapevine leaves and on grape yield

The effect of training loading and their interaction on the macroelement content in grapevine leaves and on grape yield

Rasteniev"dni Nauki 25(9): 94-99

The effect of the training, degree of loading, and their interaction on the changes in the content of N, P, K, Ca and Mg in leaves, and on the yield, was studied in Dimyat plantation, the cultivar being grafted on Shasla .times. Berlandieri 41 B rootstock with distance of planting of 3.20 .times. 1.20 m. The following trainings are examined: half-high, modified Moser, and Umbrella, having three identical degrees of loading: 12, 16, and 20 eyes/grapevine. The investigation showed that the training had prevailing effect regarding te percentage nitrogen content in the leaves in the period of maturing; on that of phosphorus in the time of blossoming and maturing, on potassium and calcium in the phase of blossoming, and on magnesium content in the period of maturing. Except for calcium content, teh loading exerts the slightest effect on the elements contained in the leaves, with this effect being totally unproved regarding phosphorus in the two phases and magnesium in the period of blossoming. The interaction of the two factors has paramount effect on the nitrogen content in the course of blossoming, as well as on the potassium and calcium during the period of maturing. The yield per grapevine is clearly influenced by the training, with the half-high and Umbrella variants being almost identical and on a higher level. The loading exerts a strong effect on the yield, with that of 16 eyes per grapevine being the optimum.

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