The spray timing was once at grape bunch closure, once at the start of veraison, and once at 50% completion of veraison. After the first spray there was already a noticeable difference in greenness of leaves and greenness of chlorophyll. After the second 13Essentials spray you could really see the difference between the yellowish control block not sprayed and the balanced, green, 13Essentials sprayed block.
By the time we harvested the grapes, huge differences could be seen: The control block did not hold up to the drought stress of summer, leaves are yellow, and photosynthesis/chlorophyll has vastly declined. The 13Essentials spray block was looking green and healthy, leaves not yellowing, and more tolerant to the drought-i-ness of late summer before harvest.
Please see attached photo’s two pictures of the control block east and west sides of vines and two pics of the 13Essentials spray block east and west sides of the wines
The control block had 100 lbs./ac. green house grade potassium nitrate in the spring. Then micronutrients where sprayed three times during summer including 1 lb. boron/ac, 5 lbs. epsom salt/ac, 1 gal. 10% humic scid/ac and 1 qt. stimplex (Biocrop stimulant). Pictures below are east and west side control (left) and with 13Essentials spray (Right).