PDF(Pubmed)
Abstract：
UNASSIGNED: Greenhouse vertical farming under natural sunlight is an alternative farming technique that grows crops in a stacking column and extends in a vertical direction. Sunlight availability is one of the crucial factors for crop development in vertical farming. Therefore, this investigation aimed to examine the effect of sunlight availability on lettuce growth and yields at different levels of vertical shelves.
UNASSIGNED: Six shelves were constructed with three levels: upper, middle and lower levels. Lettuces (Lactuca sativa L.) as \'Baby Cos\' and \'Green Oak\' at 14 days after sowing were planted on the three levels. The photosynthetic photon flux density (PPFD) was recorded, and the PPFD values were then converted to the daily light integral (DLI). Plant height and canopy width were measured three times at 14, 21 and 28 days after transplanting. At maturity, fresh weight (FW) was directly monitored after harvest.
UNASSIGNED: The results showed that the highest PPFD and DLI values were found at the upper level (PPFD 697 μmol m-2 s-1 and DLI 29 mol m-2 d-1) in comparison to the middle (PPFD 391 μmol m-2 s-1 and DLI 16 mol m-2 d-1) and lower (PPFD 322 μmol m-2 s-1 and DLI 13 mol m-2 d-1) levels. The lowest plant height and canopy width values were observed on the upper levels for both lettuce varieties during the three measurement dates. The middle (\'Baby Cos\' = 123.8 g plant-1 and \'Green Oak\' = 190.7 g plant-1) and lower (\'Baby Cos\' = 92.9 g plant-1 and \'Green Oak\' = 203.7 g plant-1) levels had the higher values of FW in comparison to the upper level (\'Baby Cos\' = 84.5 g plant-1 and \'Green Oak\' = 97.3 g plant-1). The values of light use efficiency (LUE) showed an increased trend from the upper to lower levels in both varieties, with values of \'Baby Cos\' of 0.10 g mol-1 in the upper level, 0.28 g mol-1 in the middle level and 0.26 g mol-1 in the lower level and \'Green Oak\' of 0.12 g mol-1 in the upper level, 0.44 g mol-1 in the middle level and 0.57 g mol-1 in the lower level. The findings of the study indicated the viability of utilizing vertical shelves for lettuce production.
UNASSIGNED: Six shelves were constructed with three levels: upper, middle and lower levels. Lettuces (Lactuca sativa L.) as \'Baby Cos\' and \'Green Oak\' at 14 days after sowing were planted on the three levels. The photosynthetic photon flux density (PPFD) was recorded, and the PPFD values were then converted to the daily light integral (DLI). Plant height and canopy width were measured three times at 14, 21 and 28 days after transplanting. At maturity, fresh weight (FW) was directly monitored after harvest.
UNASSIGNED: The results showed that the highest PPFD and DLI values were found at the upper level (PPFD 697 μmol m-2 s-1 and DLI 29 mol m-2 d-1) in comparison to the middle (PPFD 391 μmol m-2 s-1 and DLI 16 mol m-2 d-1) and lower (PPFD 322 μmol m-2 s-1 and DLI 13 mol m-2 d-1) levels. The lowest plant height and canopy width values were observed on the upper levels for both lettuce varieties during the three measurement dates. The middle (\'Baby Cos\' = 123.8 g plant-1 and \'Green Oak\' = 190.7 g plant-1) and lower (\'Baby Cos\' = 92.9 g plant-1 and \'Green Oak\' = 203.7 g plant-1) levels had the higher values of FW in comparison to the upper level (\'Baby Cos\' = 84.5 g plant-1 and \'Green Oak\' = 97.3 g plant-1). The values of light use efficiency (LUE) showed an increased trend from the upper to lower levels in both varieties, with values of \'Baby Cos\' of 0.10 g mol-1 in the upper level, 0.28 g mol-1 in the middle level and 0.26 g mol-1 in the lower level and \'Green Oak\' of 0.12 g mol-1 in the upper level, 0.44 g mol-1 in the middle level and 0.57 g mol-1 in the lower level. The findings of the study indicated the viability of utilizing vertical shelves for lettuce production.
摘要：
■自然阳光下的温室垂直耕作是一种替代耕作技术，该技术在堆叠柱中种植农作物并沿垂直方向延伸。阳光的可获得性是垂直农业中作物发展的关键因素之一。因此,这项调查旨在研究在不同水平的垂直货架上，阳光对生菜生长和产量的影响。
■六个搁板由三层构成：上层，中下层。在播种后14天，将莴苣（LactucasativaL.）作为“BabyCos”和“GreenOak”种植在三个水平上。记录光合光子通量密度(PPFD),然后将PPFD值转换为每日光积分(DLI)。在移栽后14、21和28天测量了3次植物高度和冠层宽度。成熟时,收获后直接监测鲜重(FW)。
■结果表明，与中间（PPFD391μmolm-2s-1和DLI16molm-2d-1）和较低（PPFD322molm-2s-1和DLI13μm-1）相比，在较高的水平（PPFD697μmolm-2s-1和DLI29molm-2d-1。在三个测量日期中，两个生菜品种的最高水平和冠层宽度均最低。中间（\'BabyCos\'=123.8gplant-1和\'GreenOak\'=190.7gplant-1）和较低（\'BabyCos\'=92.9gplant-1和\'GreenOak\'=203.7gplant-1）的FW值比较高（\'BabyCos\'=84.5gplant-光利用效率(LUE)的值在两个品种中都显示出从上至下增加的趋势,在上层中\'婴儿Cos\'值为0.10gmol-1，中层为0.28gmol-1，下层为0.26gmol-1，上层为0.12gmol-1的\'绿橡树，中等水平为0.44gmol-1，较低水平为0.57gmol-1。研究结果表明，利用垂直货架进行生菜生产的可行性。
■六个搁板由三层构成：上层，中下层。在播种后14天，将莴苣（LactucasativaL.）作为“BabyCos”和“GreenOak”种植在三个水平上。记录光合光子通量密度(PPFD),然后将PPFD值转换为每日光积分(DLI)。在移栽后14、21和28天测量了3次植物高度和冠层宽度。成熟时,收获后直接监测鲜重(FW)。
■结果表明，与中间（PPFD391μmolm-2s-1和DLI16molm-2d-1）和较低（PPFD322molm-2s-1和DLI13μm-1）相比，在较高的水平（PPFD697μmolm-2s-1和DLI29molm-2d-1。在三个测量日期中，两个生菜品种的最高水平和冠层宽度均最低。中间（\'BabyCos\'=123.8gplant-1和\'GreenOak\'=190.7gplant-1）和较低（\'BabyCos\'=92.9gplant-1和\'GreenOak\'=203.7gplant-1）的FW值比较高（\'BabyCos\'=84.5gplant-光利用效率(LUE)的值在两个品种中都显示出从上至下增加的趋势,在上层中\'婴儿Cos\'值为0.10gmol-1，中层为0.28gmol-1，下层为0.26gmol-1，上层为0.12gmol-1的\'绿橡树，中等水平为0.44gmol-1，较低水平为0.57gmol-1。研究结果表明，利用垂直货架进行生菜生产的可行性。
