Temperature deficiency is worth attention

With the temperature decreasing, currently Shouguang farmers are busy finishing the installation of straw curtains. As a result, the ventilation time in the greenhouses has also been greatly reduced compared with the previous period, and the air humidity in the greenhouses has increased. Therefore, the farmers are reminded to strengthen the greenhouse insulation measures while strengthening Prevention of various diseases. To this end, experts reminded the future greenhouse eggplant production mainly to prevent the following diseases: insecticide poisoning, iron deficiency, hollow fruit, brown leaf disease, fern leaf virus and mosaic virus disease, brown round star disease, M. blight Sclerotinia and so on. According to the actual situation in the shed, local farmers can selectively prevent and cure a variety of common diseases and achieve targeted results to ensure that eggplant production can achieve a good harvest.

Temperature deficiency is worth attention

On October 22, the author discovered that the iron deficiency symptoms of eggplant were obvious in a large shed in Songtai Village, Sunjiaji Village, Shouguang City. According to the vegetable grower, the young leaves of the eggplant plants showed reticular yellowing approximately 3 to 5 days before, and their veins remained purple-green, while other functional leaves and flowers and fruit in the middle were not abnormal.

According to Liu Mingjie, chief expert of the Shouguang Vegetable Association, this is a typical symptom of iron deficiency in eggplant.

Iron deficiency symptom analysis

Iron is not an integral part of chlorophyll in plant leaves, but it is an indispensable element in the formation of chlorophyll. When iron plants are iron-deficient, they will affect the formation of chlorophyll, leaving only carotene, so the leaves are yellow or reticulate yellow. Change. Because the iron is not easy to move between the various organs of the eggplant, when the iron is lacking, the young leaves and leaves first lose green and yellow, and the veins are still green. When the iron is young, the whole new leaf becomes yellowish-white. Because of the small mobility of iron in plants, the new leaves lose their green color while the old leaves remain green. In the production of greenhouse eggplant, the symptoms of iron deficiency are often manifested simultaneously with zinc deficiency, so we must pay attention to the rational use of zinc fertilizer when supplementing iron.

The actual production shows that the symptoms of iron deficiency and chlorosis in eggplant are also related to rainy weather. According to the author's understanding in the greenhouse, due to the cloudy days on October 1st, the yellow leaves of the top of the eggplant plant are better than when the weather is fine. It has been aggravated; the specific reason for the analysis is that, in continuous rainy weather, there is almost no evaporation phenomenon, soil moisture is saturated, carbon dioxide in the soil does not easily diffuse into the air to form carbonates, causing symptoms of iron deficiency and chlorosis. This is also known as "iron deficiency in bad weather." If the weather turns fine, the symptoms will be significantly reduced, and some will even gradually disappear.

In addition, the iron deficiency in the shed is also closely related to the decrease in temperature and ground temperature. Due to the current cold weather, most of the greenhouses have not been made with straw curtains, resulting in a relatively low temperature in the shed and the ground temperature not reaching the ideal standard. Experts reminded eggplant that the required temperature for normal growth should be 18 to 24°C, but the temperature in the early morning in the shed was only 8 to 10°C. The sudden drop in temperature and ground temperature affected the absorption function of the plant roots, especially for calcium and iron. Absorption of trace elements such as boron and zinc is greatly reduced and this symptom is caused.

Therefore, to remind farmers to install grass curtains as soon as possible, and enhance the insulation measures to ensure the temperature of the greenhouse. At the same time rational use of all kinds of micro-fertilizers, especially iron fertilizers.

So how to apply iron fertilizer rationally? Currently, it is more effective

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