Fig. 24: Time course of marketable yield (1. and 2. class tomatoes

Fig. 24: Time course of marketable yield (1. and 2. class tomatoes).

Letters indicate significant differences at the end of the experiment (HSD, p ≤ 0,05).

The 1. class yield amounted 3-6 kg/m2 at the end of the harvest period (Fig. 25). The 1. class yield was neither affected by the light treatment (HPS versus LED) in young plant production, nor by the light treatment in the continuous production (Hybrid+LED versus Hybrid). However, 1. class yield of “HPS, Hybrid” was two times higher than of “LED, Hybrid+LED” and with that significantly different, but not statistically different to the other two light treatments.

In contrast, the 2. class yield was independent of the light treatment and amounted in all light treatments around 8-10 kg/m2 (Fig. 26).

Also, the marketable yield of the whole chamber was measured (Fig. 27). A higher marketable yield was reached with “HPS, Hybrid” (4,0 kg/plant) compared to “LED, Hybrid, LED” and “HPS, Hybrid+LED” (3,6 kg/plant) and “LED, Hybrid+LED” (3,4 kg/plant).