Planting greenhouse vegetables should pay attention to "three supplements"
First, fill light The current production to promote the use of reflective film, which is a polyester film, according to the length of the greenhouse in the use, cut the corresponding length of the reflective screen 2 with transparent tape to the two single-beam reflective screen Fix it into one, and then hang a No. 6 wire in the direction of the east-west direction on the middle column or north wall of the greenhouse, fold the upper end of the light curtain back and wrap the wire, and fix it with a pin or a bright tape to make the light curtain hang down naturally. The bright side of the aluminum plate is facing south, and the back of the reflective screen is folded back to 3 to 5 cm. The hemp rope is used as a backing rope. A bamboo stick is tied on both ends of the rope to keep the light curtain at an angle of 75 to 85 degrees with the ground. Second, supplementary coverage For pepper, eggplant, tomatoes, melons and other thermophilic crops, in December to mid-February to pay attention to cover the cover. The more common method is to use a small shed cover in the greenhouse. If the weather is very cold, black mulch can be covered at night, or straw drapes can be used. The warm-weather vegetables sown on the lunar month can be covered with double membranes. When the weather turns fine, pay attention to ventilation to cool down or reduce the membrane after the temperature rises. Third, supplemental gas fertilizer has low temperature in winter, and the organic matter in the soil is decomposed to release less carbon dioxide. The greenhouse vegetable often lacks carbon dioxide in the middle and later stages. Therefore, the following methods can be used to supplement nitrogen fertilizer according to the situation: First, deep application of ammonium bicarbonate can release carbon dioxide. Generally, 10 g of ammonium per square meter is applied, and the depth of fertilization is 5 to 8 cm; the second is the burning of biogas. The use of a fully-combusted methane lamp or a biogas furnace as a discharge device can be used after the daily sunrise. The carbon dioxide concentration in the shed can reach 1 ‰ to 1.2 ‰, and the greenhouse can be closed for one and a half or two hours until the temperature rises in the shed. When the temperature reaches 30c, the temperature is reduced again; the third is the chemical generation method. Forty ceramic containers were placed uniformly in every 667 square meters of shed. First, a 98% concentration of industrial sulfuric acid and water was diluted 1:3 and then distributed into each container. Each device contained 0.5 kg of solution. 30 grams of ammonium bicarbonate was added 30 minutes after sunrise each day, and a dilute sulfuric acid solution was added for 3 days to add ammonium bicarbonate. China Agricultural Network Editor