اثر تنش كمبود آب و تراكم بوته بر عملكرد و برخي صفات مورفولوژيك ارقام گلرنگ پاييزه

Effects of water deficit stress and plant density on yield and some morphological traits of Autumn-sown safflower cultivars

In order to investigate the effect of water deficit on yield and plant type characteristics of safflower an experiment was conducted at research station of Agriculture Faculty University of Tabriz, Withholding irrigation on three phenologi cal stages (Il=irrigation up to RJ(flowering), I, = irrigation up to R ~( s c c ond ary branches appear on leafaxils) and 14= irrigation up to R,(tenninal bud forms about 0.25 inches in diamater)) along with control(J I) was constituted the main factor and three Safflower cultivars (VI=L.R.V5l/51, V2=Zarghan279 and V3=Varamin295)with two densi ties(D,=20 and D2=40 plants.m- 2) were considered as sub factor in a split - plot factorial arranged in RCBD with 3 replications. Results showed that Zarghan with 4201.4 and 3767 kg/ha produced the highest grain yield under II and 12 irrigation treatments. D2 with 2806.4 kg/ha produced the highest grain yield . Number of branches on 2nd group, plant height and stem diameter was not affected by treatments. Varamin, and LRV produced the highest number of branches , 13 and 1I respectively , on group one under I I irrigation level. D, produced the highest number of branches ,of equal to 10, in group one number of leaf and capitul per plant. The angle between 2nd ,3rd .and 4th branches of group one with main stem from top of the plants was measured. Cultivar x density interaction for 3rd branch angle was significant in which Zarghan in 40 and LRV in 20 plants/rnʹʹ with 430 were shown the highest 3rd branch angles . Furthermore, the highest fourth branch angle was shown by L.R.V and Zarghan with 40° in II, followed by Vararnin with 310 • Under 12 treatment , L.R.V with 430 displayed the highest fourth branch angle.