In V4 the Na content showed a decreasing trend of 5.7% and 44.4% at 75% FC and 50% FC, respectively.
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Physiological, biochemical and elemental responses of grafted grapevines under drought stress: insights into tolerance mechanisms.
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The sentences
The Na content in leaves at 50% FC decreased by 19.2% in V1 and increased by 5.6% in V2, whereas in V3 a highly significant increase of 71.9% was observed (Fig. 4 L).
The N, P and K contents in all the grafts, except V3, showed an increasing trend at 50% FC.