Tab. 6: Proportion of marketable and unmarketable yield

Average fruit size of 1. and 2. class tomatoes was varying between 70-90 g / fruit (Fig. 30). It seems that fruit size decreased slightly at proceeded harvest period. The light source in young plant production did not affect average fruit size. But, as for 1. class fruits, was also here an effect of the light source in continuous production observed when lighted with LEDs in young plant production. An additional increase of 7 g was possible with “Hybrid” instead of “Hybrid+LED”. However, this effect was not observed when lighted with HPS lights in young plant production.

4.3.3 Outer quality of yield

Marketable yield was more than 60% of total yield for all light treatments (Tab. 6). While “LED, Hybrid+LED” had a low percentage of 1. class fruits was the proportion of 2. class fruits bigger. The other light treatments had nearly the same percentage of 1. and 2. class fruits. Blossom end rot fruits as well as unshaped fruits had a proportion of zero on total yield. The proportion of green fruits on total yield was in all light treatments very high due to the fact that tomato plants were not topped and allowed to grow “naturally” until the end of the experiment. Therefore, was the amount of green fruits high as new clusters developed until the end of the experiment, which were then harvested as green fruits. The proportion of green fruits was comparable in all light treatments, except “LED, Hybrid+LED” had a lower percentage.

Tab. 6: Proportion of marketable and unmarketable yield.

Treatment Marketable yield (%) Unmarketable yield (%)

1. class > 55 mm 2. class > 45-55 mm too little weight blossom end rot not well shaped green

HPS, Hybrid+LED 25 a 35 ab 14 a 0 a 0 a 26 ab LED, Hybrid+LED 14 b 43 a 19 a 0 a 0 a 24 b HPS, Hybrid 27 a 33 b 13 a 0 a 0 a 27 ab LED, Hybrid 23 ab 33 b 15 a 0 a 0 a 29 a Letters indicate significant differences at the end of the experiment (HSD, p ≤ 0,05).