At present, the tomato cultivation in the greenhouse adopts a two-year, one-on-two pattern, which is divided into autumn and winter pods and winter pods. Due to climate differences, the two tomato growth laws, nutrient demand laws and field management are all different. How to cultivate tomato in greenhouse in winter and spring? Experts suggest that farmers should strengthen the management of soil and fertilizer water and read the "three-word scriptures". The first is to supplement organic fertilizers and maintain soil health. Due to the short interval between winter and spring pods, soil management measures such as recreation and dregs are not available. Generally, fertilization, ploughing, ridging, laying of drip irrigation pipes, and transplanting are performed as soon as possible after the last season crop is pulled. Prior to plowing, reasonable supplementation of high-quality organic fertilizer has a significant effect on fertility. The second is ridge cultivation, which is conducive to ventilation and permeable water, and cultivates strong roots. The organic fertilizer is mixed with the soil by rotating tillage. The depth of rotation tillage is 20 cm. After rotation, the ridges are ridged, the ridge width is 60 cm, the height is 20 cm, and the distance between two ridges is 80 cm. A ridge double row planting mode was adopted on the ridges, and two drip irrigation pipes were laid on each ridge. Read "Water Scripture" After the colonization of tomato, it can be covered with film. After drip irrigation, 30 square meters/mu, 5 to 7 days after the second time, the second time, the amount of watering is 20 to 25 square meters/mu. Before the topping of tomato, drip irrigation once every 7-10 days, each time the amount of water is 20 square meters/mu. After the tomato is topping, as the temperature rises, the tomato water consumption increases, the irrigation time interval is reduced to 5-7 days, and the amount of irrigation water is 20-25 square meters/mu. The time interval of irrigation can also be determined by the tensiometer reading. The drip irrigation system should be adjusted in time. When there is continuous cloudy days, the amount of evaporation should be reduced. It is necessary to postpone or advance irrigation and reduce the amount of irrigation. When there are high temperatures, low humidity, and large evaporation, it is necessary to increase the amount of irrigation. Irrigate in advance, increase irrigation frequency or irrigation quota. Read "Feature Scripture" Before the rotation of the tomato, 100 kg of superphosphate can be applied to supplement calcium nutrition and meet the demand of phosphorus. After planting, a small amount of rooting amino acids and humic acid water soluble fertilizer can be applied by drip irrigation, but filtration must be done to prevent clogging of the drip holes. Fertilize 4 to 5 times before the tomato is topping, the recommended formula is 20-5-20, and the application amount is 13.3 kg/mu. After the tomato is topping, apply a high-potassium formula (12-5-35) water-soluble fertilizer, each application amount is 10 kg/mu, and apply 5 to 6 times. In the late growth stage of tomato, it can be sprayed on the leaves to supplement some trace elements. Tomato needs more calcium, calcium deficiency easily lead to umbilical rot and fruit cracking, affecting yield. Foliar spraying of 0.3% to 0.5% calcium nitrate aqueous solution or 800 to 1000 times calcium alkoxide water solution can be adopted. Calcium and other trace elements such as boron and zinc are supplemented at the same time to help fruit enlargement and increase production. Precautions First, peasant households with drip irrigation facilities are encouraged to use ridge cultivation to increase ground temperature, ventilation and permeable water, which is conducive to the growth of tomato roots and to achieve the purpose of roots and seedlings. Fourth, irrigation should try to not leak out of the root growth range of 30 cm. By digging roots to see if it meets the irrigation requirements, the irrigation volume is generally around 20 square meters/mu. Sixth, the principle of watering first-re-fertilizing-re-watering should be mastered during irrigation, which is conducive to the full transfer of the fertilized material to the root of tomato, and at the same time preventing the accumulation of salt in the drip-irrigation pipe leading to dripping plugging. medical Angio Closure Pad,angio syringe,Angio Closure Pad Anesthesia Medical Co., Ltd. , https://www.honestymed.com
Read the scripture scriptures
The second is to use organic fertilizer with high carbon and nitrogen content as much as possible, and reduce the use of manure from pure chicken manure and pig manure, and increase the input of microbial fertilizers.
The third is to do a small amount of fertilization several times, once a watering fertilizer. Fertilizer application should pay attention to the principle of early phosphorus (long roots), medium-term nitrogen (long trees), and late potassium (long fruit).
The fifth is to achieve the principle of water and fertilizer synchronization (water and fertilizer integration), the use of good quality water-soluble fertilizers, irrigation should do a good job of filtering, to prevent the drip hole block affect the use of irrigation equipment.