Pay more attention to fertilizing tomatoes

? Determination of nutrients

It is determined according to the growth situation. Generally speaking, the early results of plant growth is more exuberant, easy to grow, should use less nutrients to promote stem and leaf growth, can choose Jiamei platinum, gold spot and so on. Results during the peak period, the plant growth began to weaken, and more nutrients to promote stem and leaf growth should be used to promote seedling and protect leaves, such as Jiameijin, urea, sugar leaves and so on.

It is determined according to the weather. In cloudy and rainy days, the light in the greenhouse is insufficient and the photosynthesis is poor, so the sugar supply of two red persimmons is insufficient, so the effect of spraying sugar on the leaves is better.

? Timely spraying calcium fertilizer

Tomato fruit growth needs more calcium, when the soil calcium supply is insufficient, the fruit is prone to navel rot, fruit cracking and so on. Therefore, in the fruiting period of two red persimmons, Jiamei platinum should be sprayed 3 times to meet the calcitonin needs of tomatoes.

Scientific spraying of foliar fertilizer

The suitable interval for foliar fertilization of tomato is 5-7 days. Spraying inorganic fertilizer on the leaves is easy to produce fertilizer damage, so the interval should be longer, generally not less than 7 days.

Foliar fertilization combined with disease prevention in winter and spring often results in a significant increase in air humidity in the protected field, which is easy to cause tomato diseases. Therefore, the number of foliar fertilizer spraying in continuous cloudy days is less, and protective fungicides such as Antaisheng and DuPont Yibao should be added when applying fertilizer, and ventilation should be carried out for a short time after fertilization to reduce the incidence of disease.

When the leaf is injured properly, the excess fertilizer should be washed away with clean water, and the water content of the leaf should be increased to alleviate the damage degree of the leaf. When the soil water content is insufficient, it should be watered to increase the water content in the plant and reduce the fertilizer concentration in the stem and leaf. (Ren Zhongjun, correspondent of this newspaper)