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The experiment was carried out on hydroponic lettuce seedlings by using three seedling substrates, namely phenolic foam, sponge and mixed substrate, to explore the influence of different substrates on the seedling emergence and biological yield of lettuce seedlings.。
The results showed that the effects of different substrates were significantly different:
At the seedling stage,
The emergence rate of lettuce based on phenolic foam (T1) was the highest, reaching 98.13%.
The sponges (T2) were by 97.5%,
The lowest was mixed matrix (T3),
The speed of germination and seedling growth was in order of T2> T1> T3,
Leaf length and overground fresh weight were T1> from large to small. T2> T3;
The above ground fresh weight of lettuce was T1> after pipeline hydroponics. T2> The leaves of T3 and T1 are short and thick, and have good commercial properties.
Based on the comprehensive analysis of seedling cost, operation mode, lettuce environment and experimental results, it was found that phenolic foam substrate was more suitable for growing lettuce seedlings in subtropical hydroponic culture.
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