The weather is positive.

1, shading with branches is based on the principle of light reflection to avoid direct sunlight on vegetable seedlings and reduce the temperature rise of vegetable seedlings, thus reducing the evaporation of water in vegetable seedlings.

2. Sprinkling water is to use the principle of evaporation and heat absorption to cool the vegetable seedlings and reduce the evaporation of water in the vegetable seedlings.

Alternative scheme: through the relatively closed space between the leaves and the ground, the heat insulation layer is established to weaken convection and reduce the heat transfer rate, thus achieving the purpose of protecting vegetable seedlings;