Teacher, it's no use watching cucumber leaves get this meaning. What medicine should not be used? The weather is ok. What should I do now? Thank you.

The veins of leaves are green and yellow, which may be caused by lack of elements and magnesium and zinc. It is suggested to strengthen root system maintenance, select biological bacterial fertilizer or Genduole combined with water-soluble fertilizer for fertilizer and water irrigation, continuously promote root system development, improve absorption capacity, spray chelated zinc fertilizer on leaves for two or three times, restore green leaves, raise roots and protect leaves, and achieve high yield.