الفهرس 
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Abstract
This work was carried out to study the effect of some growth regulators on the performance and yield of inter-grown tomatoes. Two field experiments were conducted during the winter seasons of 1971-72& 1972-73, in addition to a single experiment •which was set out in 1971/72 in growth chambers (Phytotren) under controlled conditions at 15-5°c and 2o °c -10°c day and night temperatures. The three experiments comprised the following regulator treatments. 1-CCC sprayed at 100, 200 and 300 ppm• 2- NAA sprayed at 20 ppm. 3- Each of the CCC concentrations combined with 20 ppm NAA. 4-Control sprayed with water. The cycocel was sprayed 10 dayes after transplanting while the NA.A was sprayed twice; 15 and 45 days after transplanting, The results are summarized as follows: I. Field experiments: 1- CCC helped plants to resist the low temperature injury specially when applied at. The highest level 1 while NAA was ineffective in this regard. 2- CCC led to depression of plant height? Whether applied alone or with NAA. The last regulator had no effect in this concern. 3- CCC showed no clear effect on the number of leaves to the 1st cluster l in both seasons and so did NAA. 4- Significant increases in the number of flowers per cluster were obtained in both CCC and NAA treated plants. The combined application of the two regulators showed no further increase than that obtained from each one separately.