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本文旨在探讨利用太阳能对塑料大棚土壤增温的效果。连续三年试验的结果表明，太阳能热水器对塑料大棚的土壤有显著的增温效应。长江下游早春，热水器受日光后，一般可升温４０—６０℃。１ｍ２面积的热水器累计运行一小时可使２５—３０公斤水增温 ２０ ℃，使２～４ ｍ２面积水管上 ３—８厘米的土层增温 ８— ６ ℃，至翌晨 ７时尚可高于对照２—３ ℃。在 ５－２０厘米深度范围内土层越深保温性越稳定。一天内土壤增温值以１８时最高，离水管越近，增温值越高。在土层８厘米左右处设水管，排管距离１５—２０厘米，番茄、辣椒可提前出苗５—７天。热水器在增温过程中节能显著。１０—１２ｍ２床面达到上述的增温效应每天仅耗电０．２５度，以农用电每度０.０６元折算，实际费用为０．０１５—０．０２元。
This paper aims to explore the use of solar energy on plastic greenhouse soil warming effect. The results of three consecutive years of tests show that solar water heaters have a significant warming effect on the soil in plastic sheds. The lower reaches of the Yangtze River in early spring, the water heater by daylight, the general warming 40-60 ℃. 1m2 area of the cumulative operation of one hour water heater can 25-30 kg water temperature 20 ℃, 2 ~ 4 m2 area on the water pipe 3-8 cm warming 8 - 6 ℃, to the next morning 7 fashion can be higher than Control 2-3 ° C. The deeper the soil layer is, the more stable the thermal insulation is in the depth of 5-20 cm. Soil temperature in a day to 18:00 the highest, closer to the water pipe, the higher the temperature value. In the soil about 8 cm at the water pipe, drainage pipe distance of 15-20 cm, tomato, pepper germination 5-7 days ahead of schedule. Water heater energy-saving significant in the warming process. 10-12m2 bed to achieve the above warming effect consumes only 0.25 degrees per day to agricultural electricity per 0.06 yuan conversion, the actual cost of 0.015-0.02 yuan.