Usage
Generally speaking, it is recommended that foliar feeding be done in morning or evening, since hot days cause the pores on some plants' leaves to close.
One way to tell if a fertilizer has been effective is to squeeze juice from the leaves of plant and to test it with a refractometer. If after spraying with foliar fertilizer the amount of light refracted significantly rises, then foliar application has worked. To increase effectiveness it is recommended to use a spray enhancer to help the nutrients stick to the leaf and to penetrate the waxy cuticle of the leaf.
Read more about this topic: Foliar Feeding
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