How to fertilize tomatoes? These key points you need to know

?Determining the nutrients

Determine based on growth conditions. Generally speaking, in the early fruiting stage the plants grow relatively vigorously and are prone to excessive vegetative growth, so nutrients that promote stem and leaf growth should be used sparingly; Jiamei Nao Baijin, Jindian, etc. can be chosen. In the full fruiting stage the plants' growth vigor begins to weaken, so nutrients that promote stem and leaf growth should be used more to boost the vines and protect the leaves; Jiamei Jinpin, urea, Tangye, etc. can be chosen.

Determine based on weather conditions. On cloudy and rainy days, the light inside the greenhouse is insufficient and photosynthesis is poor, so the sugar supply to the tomatoes is inadequate; at this time, spraying sugar on the leaves gives relatively good results.

?Spray calcium fertilizer in a timely manner

Tomato fruit growth requires a relatively large amount of calcium. When the soil supplies insufficient calcium, the fruit is prone to blossom-end rot, fruit cracking, etc. Therefore, during the fruiting stage of tomatoes, Jiamei Nao Baijin should be sprayed 2~3 times to meet the tomatoes' need for calcium.

Spray foliar fertilizer scientifically

The timing should be appropriate. The suitable interval for foliar fertilization of tomatoes is 5~7 days. Spraying inorganic chemical fertilizers on the leaves is prone to causing fertilizer damage, so the interval should be longer, generally no shorter than 7 days.

Combine with disease prevention. Foliar fertilization in winter and spring often causes the air humidity in protected areas to increase noticeably, which easily triggers tomato diseases. Therefore, on consecutive cloudy days the number of foliar fertilizer sprayings should be reduced; when fertilizing, protective fungicides such as Antaisheng and DuPont Yibao should also be added, and after fertilizing, ventilation should be carried out for a short time to reduce the disease incidence.

The dosage should be appropriate. When leaf damage occurs, use clean water to wash off the excess fertilizer and increase the water content of the leaves to alleviate the degree of leaf damage. When the soil water content is insufficient, watering should also be done to increase the water content in the plant and reduce the concentration of fertilizer solution in the stems and leaves. (Correspondent for this newspaper: Ren Zhongjun)