In the Mediterranean region, tomato plants are often cultivated in two short cycles per year to avoid the heat of summer and the low solar radiation of winter. Supplementary light (SL) makes it possible to cultivate during the dark season. In this experiment, a tomato F1 hybrid cultivar DRW7723 was cultivated in a greenhouse for a fall-winter cycle. After transplant, light emitting diode (LED) interlighting, with two light spectra (red + blue vs. red + blue + far-red) was applied as SL. Plant growth, yield, gas exchange, nutrient solution (NS) consumption, and fruit quality were analyzed. In general, the effects of adding far-red radiation were not visible on the parameters analyzed, although the yield was 27% higher in plants grown with SL than those grown without. Tomatoes had the same average fresh weight between SL treatments, but the plants grown with SL produced 16% more fruits than control. Fruit quality, gas exchange and NS uptake were not influenced by the addition of far-red light. Interlighting is, therefore, a valid technique to increase fruit production in winter but at our latitude the effects of adding far-red radiation are mitigated by available sunlight.

中文翻译：

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在地中海温室条件下，补充的远红光不会影响番茄的生长或产量

在地中海地区，每年通常以两个短周期种植西红柿，以避免夏季的高温和冬季的低太阳辐射。补充光（SL）使在黑暗季节进行栽培成为可能。在该实验中，将番茄F1杂交品种DRW7723在温室中进行秋冬循环。移植后，将具有两个光谱（红色+蓝色与红色+蓝色+远红色）的发光二极管（LED）相互照明作为SL。分析了植物的生长，产量，气体交换，营养液（NS）消耗和果实品质。通常，在分析的参数上看不到添加远红外辐射的效果，尽管使用SL种植的植物比未种植SL的植物高27％。在SL处理之间，西红柿的平均新鲜鲜重相同，但是使用SL种植的植物比对照种植的果实多出16％。远红光的添加不会影响果实的品质，气体交换和NS吸收。因此，补光是增加冬季水果产量的有效技术，但在我们的纬度上，可用的阳光可以减轻添加远红外辐射的影响。