The waterlogging caused by the high groundwater level in the southern paddy field has always been the main factor restricting the high agricultural yield. Now we introduce a practical and economical technology for underground pipe sinking. First, material preparation. (1) PVC perforated corrugated pipe with a diameter of 2 cm (67 meters per mu, produced by Shanghai Fengxian Guangming Plastic Factory, available on the market). (2) A stainless steel water gate valve (for drainage) with an aperture of 2 cm and a matching closure cover (prevents entry of dirt). (3) Crude rice bran (or sand), as a plugging and infiltration material for bellows. Second, the installation method. (1) When installing, each pipe is 10 meters apart. (2) In the block, dig a deep groove about 50 centimeters deep and about 70 centimeters deep in the low position. (3) Spread coarse rice bran (or sand) at the bottom of the tank. (4) The perforated corrugated pipe pre-assembled with the water gate valve and the closing cover is buried in the chute (one end of the high part extends out of the ground surface). (5) Cover Rough Rice Paddy (or Sand) on its left and right sides. (6) Cover soil and prepare soil. Third, use. Because the outlet of the drop is connected with the drain at the side of the field, when the water gate valve is needed to open the water, the water in the soil will pass through the thick rice paddy (or sand) layer with low density, and it will flow into the drop pipe. Slowly flow to the drain, playing the role of drop. Fourth, maintenance. Always clean the outlet valve, check and clean the closure cover and dirt to ensure the smooth flow of the buried pipe. If properly maintained, the general life of the equipment for waterlogging is 50 years. Fifth, investment costs. Accounting per acre: PVC perforated corrugated pipe 67 meters, 3.3 yuan / meter, a total of 220 yuan; manual excavation, paving rough rice dumplings (sand), covered soil and other costs 200 yuan; water gate valve and closing lid 60 yuan. The total cost is 480 yuan/mu.
N&R Bio Industries Inc. (Xi'an) , http://www.sxgenistein.com