Fig. 25: Average weight of tomatoes (1. class fruits) at different treatments

first class tomatoes. Especially the grafted ones were nearly 10 g heavier than the ungrafted tomatoes grown under 240 W/m2 .

Average weight of tomatoes 75 80 85 90 95 100 105 110 115 120 14.10.11 11.11.11 09.12.11 06.01.12 03.02.12 02.03.12 30.03.12 1. class (g/fruit)

300 HPS, ungrafted 300 HPS, grafted 240 HPS, peat 240 HPS, pum ice 240 HPS, s cale 240 HPS, tending

Fig. 25: Average weight of tomatoes (1. class fruits) at different treatments.

To observe the success of fruit setting until harvest, the setting of fruits was classified and the number of “fruits total” (fruits that were supposed to be harvested later) was registered. When a cluster was harvested, the total number of “fruits harvested” was counted. The number of “lost fruits” is marking the difference between the number of fruits that were registered at setting (fruits total) and the number of harvested fruits. “Lost fruits” might have been aborted or did not develop well and stayed small. Much light had no influence on the number of fruits (Fig. 26). The grafted tomatoes showed an increased number of “lost fruits” (Fig. 26 a). “240 HPS, peat” (Fig. 26 c) had in average 0.5 more fruits total and fruits harvested than “240 HPS, pumice” (Fig. 26 d).