اﺛﺮ ﺗﺎرﯾﺦ ﮐﺎﺷﺖ ﺧﺎك ﭘﻮش زﻧﺪه ﺑﺮ ﺧﺼﻮﺻﯿﺎت روﯾﺸﯽ ارﻗﺎم آﻓﺘﺎﺑﮕﺮدان

Effect sowing date of living mulch on vegetative characteristics of sunflower cultivars

This investigate was conducted in order to study the response of vegetative traits of sunflower cultivars in presence of fenugreek as a living mulch at Razi University in 2017 as a factorial experiment based on randomized complete block design.First factor was the sowing fenugreek at four levels (control (without mulch), 15 days before sowing of sunflower, simultaneous sowing with sunflower, 15 days after sowing of sunflower) and the second factor was three sunflower cultivars (Progress, Farrokh, Lakomka).Results showed that height, stem weight, leaf number, leaf weight and leaf area index were 26.4%, 62.1%, 24.8%, 68.5% and 63% lower than control condition (without mulch), respectively.The effect of mulch presence under the simultaneous sowing with sunflower and 15 days after sowing of sunflower on growth characteristics of sunflower was not significant.The lowest RWC was obtained by planting fenugreek before sunflower (65.2% and 52.7% in the 1/3 of growth and flowering stages).Progress cultivar had the highest height (212 cm), stem weight (523 g/plant), leaf number (25.5 per plant), leaf weight (157.4 g/plant), leaf area index (6.2) and RWC (77.8% and 70.5% in the 1/3 of growth and flowering stages, respectively). But the highest leaf area ratio (0.013 m2/g) was assigned to Farrokh.