لخّصلي

MATERIALS AND METHODS The field experiment was conducted dur- ing the 2004-5 growing season at the ex- perimental farm of the College of Agricul- ture, Shiraz University (Shiraz, Iran,) lo- cated at Badjgah (29?The data collected were subjected to analy- sis of variance using MSTATC software and using the SAS statistical tech nique.The PGR foliar treatments included CCC at 2.20 kg ha-1 sprayed over the foliage at growth stage (ZGS) 25, (Zadoks et al., 1974) ethephon at 0.28 kg ha-1 sprayed over the foliage at growth stage (ZGS) 39, and the controls (without any PGR) were as- signed to sub-plots.The measured variables included grain yield (t ha-1), spike m-2, grains plant-1, plant height (cm), spike length (the main shoot spike, cm), LAI (the leaf area was determined with a Leaf Area meter delta T Device model) and dry matter produced (g plant-1).Some physico-7.6, total organic carbon (%) = 1.17, total nitrogen (%)= 0.114, EC (dS m-1) 102 = 0.402, potassium (mg kg-1)= 590, phos- phorus (mg kg-1)= 26.The seeds were hand-sown in plots 3 m wide and 4 m long that were seeded at the rate of 250 plants/m2 in mid-November.

MATERIALS AND METHODS
The field experiment was conducted dur- ing the 2004-5 growing season at the ex- perimental farm of the College of Agricul- ture, Shiraz University (Shiraz, Iran,) lo- cated at Badjgah (29° 50´ N and 52° 46´ E; elevation 1,810 m above mean sea level) on a clay soil. Precipitation was 243 mm during Effects of PGRs and Nitrogen on Vegeta- the growing season. Some physico-7.6, total organic carbon (%) = 1.17, total nitrogen (%)= 0.114, EC (dS m-1) 102
= 0.402, potassium (mg kg-1)= 590, phos-
phorus (mg kg-1)= 26. The cultivar Shiraz with a 75-80 cm stem height was chosen as a common winter wheat in Shiraz area. The seeds were hand-sown in plots 3 m wide and 4 m long that were seeded at the rate of 250 plants/m2 in mid-November. Uniformity of sowing depth was achieved by using a hand dibbler to make holes of 3-5 cm deep and the spaces between the two rows were 20 cm in all plots.
The design of the experiment was a ran-
domized complete block with treatments arranged as split plot with four replicates. Nitrogen levels (0, 100 and 200 kg ha-1) were the main plots. The N was applied as Urea (46% N), half at the time of stem elon-
gation and the other half at onset of flower-
ing. The PGR foliar treatments included CCC at 2.20 kg ha-1 sprayed over the foliage at growth stage (ZGS) 25, (Zadoks et al., 1974) ethephon at 0.28 kg ha-1 sprayed over the foliage at growth stage (ZGS) 39, and the controls (without any PGR) were as-
signed to sub-plots. The measured variables included grain yield (t ha-1), spike m-2, grains plant-1, plant height (cm), spike length (the main shoot spike, cm), LAI (the leaf area was determined with a Leaf Area meter delta T Device model) and dry matter produced (g plant-1). Within each plot, an area 1m×1m (with guard rows) was marked and left un-
disturbed for harvesting at crop maturity. Dry weights were recorded after the plant material had been oven-dried at 70ºC for 48 hours.
The data collected were subjected to analy-
sis of variance using MSTATC software and using the SAS statistical tech nique. The least significant difference (LSD) test was used for the mean comparisons.