نوع مقاله : مقاله پژوهشی
نویسندگان
1 گروه زراعت دانشگاه علوم کشاورزی و منابع طبیعی ساری
2 دانشگاه علوم کشاورزی و منابع طبیعی ساری
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
In order to determine the critical period of weed damage in peanut a field experiment was laid out based on randomized complete block design (RCBD) with three replications in 2012. Treatments consisted of two series of weed interference and weed-free periods of 15, 30, 45, 60 and 75 days after planting of peanut. Full-season control of weeds and full-season interference of weeds were also included as control treatments. Seed yield was affected significantly by control and weed-free treatments. Increasing of weed interference periods decreased peanut seed yield, while increasing of weed control periods increased peanut seed yield. Mean comparisons showed that the highest (2100 kg.ha-1) and lowest (294 kg.ha-1) of peanut yield observed at full season weed-free and 75 days weed interference after planting, respectively. Full-season weeds interference reduced peanut yield by 81% compared with full season weed-free plots. Beginning and end of the critical period of weed damage were determined by Gompertz and Logistic equations with high accuracy (R2=0.96 and R2=0.95, respectively). Based on 5, 10 and 15% acceptable seed yield losses, the critical period of weed control were 9 to 76, 12 to 63 and 16 to 54 days after planting at Sari condition.
کلیدواژهها [English]