Response of Over-summer Hydroponic Lettuce to Nutrient Solution Temperature Control

越夏水培生菜对营养液温度调节响应研究（英文）

Temperature, as an important feature of hydroponic nutrient solution, is closely related to dissolved oxygen content of nutrient solution and growth status of plant roots. How to precisely adjust the temperature of nutrient solution is the key to obtain high quality and high yield of hydroponic vegetables over summer. With Lactuca sativa vat. crispa ＇Luosheng No.3＇ as the test material, the effect of chiller cooling technology on the temperature of nutrient solution, as well as on the yield and quality of Luosheng No.3, in over-summer hydroponic cultivation was studied. The results showed that the chiller cooling technology controlled the nutrient solution temperature in a reasonable range （（20 ± 1）℃） and promoted the growth and dry matter accumulation of Luosheng No.3, instead of affecting the quality. In short, the chiller cooling technology is applicable to the temperature regulation of nutrient solu- tion in hydroponics over summer.

营养液温度作为水耕栽培营养液的重要特性与营养液水溶氧含量和植物根系生长状况密切相关,如何精准调控营养液温度是越夏水耕栽培蔬菜能够取得优质高产的关键。以生菜(Lactuca sativa var.crispa‘Luosheng No.3’)为试材,研究了冷水机降温技术用于越夏水耕栽培营养液温度的调控效果,及其对生菜生长和品质的影响。结果表明,采用冷水机降温技术可以将营养液温度控制在合理的范围(20±1)℃,对生菜生长和干物质累积具有明显的促进作用,且不会影响生菜的品质。总之,将该技术应用于越夏水耕栽培营养液温度调控是完全可行的。