نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشجوی کارشناسیارشد، دانشکدة علوم کشاورزی، دانشگاه گیلان، رشت، ایران
2 استادیار گروه مهندسی آب، دانشکدة علوم کشاورزی، دانشگاه گیلان، رشت، ایران
3 استادیار پژوهش، مؤسسة تحقیقات برنج، رشت، ایران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
This study was conducted in 2014 to determine the most appropriate drainage distance and duration in mid-season drainage of paddy fields. The experimental field was located in Rice Research Institute of Iran, Rasht, Guilan Province, at 49.63˚ E and 37.16 ˚ N and an altitude of 24.6 m above sea level. The experiment was carried out on Hashemi cultivar in the plots of 3×4 m as a completely randomized design in three replications with the factors of drain distance at three levels of 7.5, 10 and 15 m and depth of 90 cm plus drainage duration within two levels of 7 and 11 days. Such characteristics as plant height, number of tillers, panicle length, filled grains, 1000-grain weight, dry matter, harvest index, yield, soil moisture and discharge of drains were determined. As a result, the effect of mid-season drainage duration on yield showed that the maximum yield was gained in the case of 7-day drainage duration with an amount of 3987 kg ha-1. Also, based on the effects of drains' distance on yield, a distance of 15m obtained led to a maximum yield of 3446 kg ha-1. Statistical analysis of drainage distance and mid-season drainage duration interaction on yield revealed that the maximum yield (4384 kg ha-1) was gained in the treatment of 7-day mid-season drainage duration and drains, distance of 15m, finally recommended for the study area.
کلیدواژهها [English]