The effects of foliar spray wary with the kind of phosphate andthe time of spray. In the experiment of spraying 2 times in Aug., Ca (H_2PO_4)_2significantly increased sugar, while NaH_2PO_4 remarkbly reduced acid, KH_2PO_4remarkably enlarged fruit. In the experiment of spraying 10 times in Aug~Oct.only Ca (H_2PO_4)_2 significantly increased sugar, acid and vitamin C while theother 3 phosphates reduced these contents. These effects can be figured out bythe following facts: a. Leaf phosphorous increases and nitrogen decreases afterspraying. b. Repressing starch accumulation promotes leaf photosy...
