Stability test and identification of factors causing inconsistencies in the quantity and quality of lettuce yield (Lactuca sativa L.) at different planting times in NFT system hydroponics

Lettuce is a vegetable plant that belongs to the Asteraceae or Compositae family and has great potential especially in the agricultural industry. agricultural land in Indonesia is getting narrower resulting in not maximizing agricultural yields. To overcome this, cultivation techniques that do not require large areas are needed, one of which is NFT hydroponics. In the process, there are obstacles that arise, namely the instability or inconsistency of the quality and quantity of lettuce production in each planting period. the factors that cause the instability of lettuce crop yields are due to changes in microclimate conditions and cultivation techniques that are not in accordance with the SOP. This study used a 1-factor Randomized Block Design (RAL) with 10 replications. The factor tested as treatment was different planting time (W) consisting of 3 levels, namely: Ws (July-August), Wd (August-September), Wt (September-October). From the research results, the July-August period can provide the best results with environmental conditions that are in accordance with the requirements for lettuce growth with a temperature of 25-33oC and 78% humidity. As well as cultivation techniques in accordance with the SOP that is run.