Determination of optimum seed rate for rain fed winter rapeseed
2006
Ranjbar, Fardin | Halamzadeh, Hossein | Beg, Akhtar
In order to investigate the impacts of optimum seed rate on yield components and seed yield, a randomized complete block design field experiment with 3 replication was conducted winter-summer, 2003 and 2004. at Dry land Agricultural Research Institute-Sararood, (Lat. 34°20 N and Long 47°] 9 E). kermanshah. Iran. In this experiment first factor consisted of 4 level of seed rate (4, 6. 8 and 10 kg/ha) and other factor consisted of 3 row distances (12, 24 and 36cm). Sowing date was October each year but in second year, due to in uniformity germination the plots were replanted again next month. Immediately; after sowing plots irrigated for germinative. Used variety was Parade. Cultivation was performed in autumn. Fertilizer formula of N80p6o used before sowing, and then seeds were cultivated by Planter machinery. In during growth season were noted six traits: plant height, number of branch, number of pod/plant, number of seed/pod, T.K.W and yield. The results of Barttlet test showed that the variances are not homogeneity; therefore combined analysis was not performed. In the each year, Row distance had no-significant effects on ever treatment. Optimum seed rate had significant effects on number of branches and pod/plant. Decrease in seed rate enhanced in number of branches and pod per plant. Number of branches and pod per plant showed significant decreases with increasing seed rate. In the each year, Optimum seed rate had significant effects on grain yield and using 8 kg seed per hectare had highest grain yield. 970 kg/ha in the first and 1299 kg/ha in the second year was the highest grain yield. Therefore 36 cm row distance with 6-8 kg/ha is recommended, because field management in this condition is easier than others.
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