COMPARATIVE BOTANICAL STUDIES ON TWO NEWLY TOMATO GENOTYPES AS AFFECTED BY WASTEWATER AND SHADING: I. MORPHOLOGICAL CHARACTERS.

Two field experiments were carried out at the Agric. Experimental Station, Faculty of Agric., Mansoura University, Egypt during the two growing seasons of 2007-2008 and 2008-2009,   aiming to evaluate botanically two newly tomato genotypes grown under shading and wastewater of El-Delta company of fertilizers and Talkha electricity generate mixed with sewage of the vicinity villages, at Dakahlia Governorate, Egypt. The data indicated that Cheyenne (e 448) genotypes recoded an increase in all growth characters studied compared with Gs 12 at different growth stages in both growing seasons. However, in both genotypes, Plant height, numbers of internodes, leaves and branches on the main stem, as well as, fresh and dry weight of the shoot system were increased significantly due to wastewater application at 50% level whereas decreased insignificantly at 100% level. Shading agent seemed to have a stimulating effect on different growth characters of the two tomato genotypes under the present investigation compared with the control
The interaction treatments indicated that shading enabled the developing tomato plants to withstand, wastewater at 100% level .The "S" or sigmoide growth curve was detected in both tomato genotypes studied during the two tomato growing seasons. The highest rate of increase was detected between the 1^st and 2^nd sampling date.
Genotype (2) bloomed earlier than genotype (1); by about 7-10 days in the first and second seasons respectively and showed shorter growing period and earlier maturation than genotype.(1). overall all treatments examined. However, irrigation with Wastewater at 50% level increased whereas shading enlowered the period elapsed from transplanting to flowering in both tomato genotypes. Similarly, wastewater at 100% level delaying flowering but only with genotype (1) by about 15-19 days and at 100%  hasten following by about 12-15 days in the first and second seasons respectively. Shading with wastewater at 100% has no significant effect in this respect