营养液温度调控对设施越夏水培生菜产量与品质的影响

以生菜"罗生3号"为试材,利用冷水机降温技术对越夏水耕栽培营养液进行降温处理,研究了该技术对生菜产量和品质的影响。结果表明:利用冷水机降温技术将营养液温度控制在(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。说明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。

营养液温度调控对设施越夏水培普通白菜生长与产量的影响

在水培系统中,营养液温度对作物生长至关重要,越夏蔬菜生产过程中常发生营养液温度过高而影响生产的问题。本试验以3个普通白菜品种夏绿2号、金品1夏和京冠1号F_(1)为试材,利用冰和蓄冷剂2种不同降温材料,通过3种方式对营养液进行降温处理(T1,保温被+3 L蓄冷剂;T2,保温被+5 L蓄冷剂;T3,保温被+5 L冰块),研究不同营养液降温方式对设施越夏水培普通白菜生长和产量的影响。结果表明:在营养液快速升温初期将3 L蓄冷剂或5 L冰块加入外包保温被的营养液桶中,营养液温度可以降低3~5℃,且维持适宜根际温度5 h左右,对普通白菜生长、干物质累积、产量具有明显促进作用;而保温被+5 L蓄冷剂处理的营养液温度由于降幅过大,导致地上部和地下部温差过大,反而不利于普通白菜生长。综上,采用保温被+3 L蓄冷剂、保温被+5 L冰块两种降温技术应用于越夏水培营养液温度调控效果较好。

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

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.