Tab. 5: Cumulative total number of marketable fruits

The weekly harvest of 1. class and 2. class fruits amounted 1,0-3,0 kg/m2, but was most of the time 1,5-2,0 kg/m2. While all light treatments were more or less with a weekly constant yield, fluctuated the yield of “HPS, Hybrid” quite much (Fig. 28).

But, the number of 1. class fruits was significant higher for “HPS, Hybrid” compared to “LED, Hybrid+LED” (Tab. 5). The number of 1. class fruits was neither influenced by the light treatment in young plant production nor by the light treatment in the continuous production. The number of 2. class fruits was statistically higher in “LED, Hybrid+LED” than in “LED, Hybrid”. When young plant production was under HPS lights was the number of 2. class fruits not affected by the light treatment in continuous production, while, when young plant production was under LEDs was the number of 2. class fruits affected by the light treatment in continuous production (compare “Hybrid” to “Hybrid+LED”). However, the total number of marketable fruits was not significantly different between light treatments regarding young plant production nor regarding continuous production.

Tab. 5: Cumulative total number of marketable fruits.

Treatment Number of marketable fruits

1. class 2. class total (1. class + 2. class) (no/m2) (no/m2) (no/m2) HPS, Hybrid+LED 61 ab 115 ab 176 a LED, Hybrid+LED 34 b 137 a 171 a HPS, Hybrid 69 a 116 ab 185 a LED, Hybrid 54 ab 104 b 158 a

Letters indicate significant differences (HSD, p ≤ 0,05).

Average fruit size of 1. class tomatoes varyied between 85-105 g / fruit (Fig. 29). On average was the weight of 1. class tomatoes independent of the light source in young plant production. However, when plants received LEDs in young plant production, was a significantly higher average weight of 1. class fruits measured, when lighted with “Hybrid” compared “Hybrid+LED”. But, when plants received HPS in young plant production had the light treatment in continuous production no influence on fruit size.