Excessive amounts of these nutrients depress the uptake of calcium. Water plants during extended dry periods. Tomatoes need 1 to 1 inches of water per week. Add organic matter to the soil. In either soil, organic matter will increase plant uptake of water and calcium.
Tomato blossoms are very sensitive to temperature.
At temperatures of 55 to 60 F, pollination can be severely impaired, and very few fruits will form. Temperatures of 90 to 95 F are also very unfavorable for pollination. It takes 55 to 105 days to maturity depending on the tomato variety. Picked tomatoes should be placed in the shade. Light is not necessary for ripening immature tomatoes.