Selection of greenhouse tomato drip irrigation equipment
Water pump: Choose a suitable water pump according to the actual situation of the farmers. Generally, the water output is about 10 m3 / h.
Water meter: The selection of the water meter should take into account that the head loss value is within an acceptable range, and is arranged upstream of the fertilizer injection port to prevent the fertilizer from corroding the water meter.
Valve: According to actual needs, generally choose 50 ball valve and 32 ball valve and 16 drip irrigation with bypass valve.
Filter: The filter is a key component to ensure the safe and stable operation of the entire system. The water outlet of the drip irrigation pipe is small and easily blocked by small particles. Using a filter can effectively reduce the impurities in the irrigation water and reduce the probability of the outlet being blocked , Thereby improving the service life of drip irrigation pipes. It is recommended to use a 1.5-inch disc filter when selecting a type. The disc filter has a good filtering effect on various water qualities, and has a longer service life than a screen filter and is easy to clean.
Fertilizer: 1 inch Venturi fertilizer is generally used. Venturi fertilizer does not require external power and directly absorbs fertilizer from open fertilizer tanks. It has a large amount of fertilizer, simple operation, low wear rate, easy installation, and easy to move. , Uniform nutrient concentration and strong corrosion resistance.
Branch pipe in the greenhouse: According to the water demand and irrigation time of the tomato, it is recommended to use a PE hose with a diameter of 32 or 40 mm. When the economic flow rate is 1.5 m / s, the water output is 6-10 m3 / h, and the water is 2-3 hours. Can meet the irrigation needs of tomatoes.
Capillary tube: Choose proper dripper distance and dripper flow according to the water demand of tomato and the related properties of the soil. It is recommended to use an inlay patch drip irrigation tube with a wall thickness of 0.38 mm, a tip spacing of 20 cm, and a tip flow of 1.7 liters / hour. The laying principle of one pipe per row is generally adopted.
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