Temporal Variations in Photosynthesis and Leaf Element Contents of '<i>Marselan</i>' Grapevines in Response to Foliar Fertilizer Application.

As can be seen from Figure 3 C, the F v / F m value of each treated leaf showed a trend of first decreasing, then increasing and then decreasing with the growth and development of grapes.

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Table 1 shows that the SPAD value of grape leaves under different treatments showed an overall trend of increasing first and then decreasing, reaching a peak at 90 days after flowering and then decreasing.

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The phosphorus content in leaves showed a decreasing trend in the whole growth cycle.

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