黄瓜深液流(DFT)无土栽培根呼吸

On root-breathing in DFT soilless cultivation for cucumber

深液流(DFT)无土栽培技术广泛应用于我国南方地区。此栽培技术是将植株挂于液面上,而根垂于深层(5-10cm)流动营养液中。在这样的栽培方式下,植株根部在呼吸时就比较容易缺氧,而浸在营养液中的根呼吸所需要氧即来源于营养液中的溶解氧(DO),在栽培过程中经常出现植株根系发黄、腐烂现象,主要原因即为根呼吸过程中缺氧。本文就解决黄瓜深液流(DFT)无土栽培过程中根呼吸缺氧问题提出一些浅见,即既要保证植株有部分根露在空气中,又要采取适当的措施与方法使营养液中有足够的溶解氧供给浸在营养液中的根进行呼吸。

DFT soilless cultivation is widely used in the south of China. This cultivation technology means plants are pegged on the surface, while the root is hanging in the deep flowing nutritive liquid （5 - 10cm）. In this way of cultivation, the roots of plants will lack oxygen when they breathe, while the oxygen that the root needs is DO from the nutritive liquid. In the process of cultivation, the roots of plant are becoming yellow and rotten, the nain cause of these is that the roots lack oxygen during the breathing process. This paper advances some advices about the problems--lacking of oxygen in process of the DFT soilless cultivation for cucumber not only to ensure that parts of the roots of the plant are in the air, but also make sure there is enough DO for roots to breathe in the nutritive liquid by appropriate measures and methods