, as well. The protective agent has balanced and comprehensive nutrition, high fertilizer effect, good protective property, safe application, low cost and convenient application; the invention has double effects of nutrition and protection and is easy to be absorbed by crops, and has unique effects especially on improving crop photosynthesis, strengthening crop stress resistance, guaranteeing blossoms to bear fruit, expanding fruit, improving the color, polish and plumpness of the fruit, improving quality, developing marketability, etc.
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