Title: Evaluation of new rice line D3 in farmers’ fields of Guilan Province
Author: Maryam Hosseini Chaleshtori
New rice cultivar (D3) from induction of chemical mutation in the Gohar cultivar along with Gohar cultivar (parent cultivar) were planted in fields of progressive farmers in three sites, including Talesh (Lisar), Fouman (Gasht), and Langrud (Mobandan) in Guilan province. Evaluation of the most important agronomy characters for Gohar cultivar and D3 line in the mentioned cities showed that the new rice cultivar had high grain yield (7.15 t/ha) in Fouman (Gasht) and low grain yield (5.2 t/ha) in Langrud (Mobandan). In Talesh and Fouman, the grain yield of the Gohar cultivar was the same and equal to 7 and 7.8 t/ha respectively, which was higher than new line grain yield (6 and 7.15 t/ha). In Langrud, the grain yield of the Gohar cultivar and new line was alike and equal to 5.2 t/ha. The results showed that the grain yield of mutant line D3 (6.12 ± 0.57) was higher than Gohar (6.67 ± 0.77) in all of the sites in Giulan province. The plant height of the new rice line was shorter than Gohar with 3-10 cm differences in all locations, which the lowest and highest differences were related to Fouman (Gasht) and Talesh (Lisar) counties respectively. In the new rice cultivar, the panicle number per plant was between 12-24 in average and this trait for Gohar was between 18-27 panicles. The new line and Gohar cultivar showed huge differences based on the grain number per panicle so the new rice line was better and higher than Gohar based on the grain number per panicle in all sites. The growth duration from seeding to complete ripening stage was for new rice line 118-127 days and for Gohar 136-141 days. All of the rice farmers in studied sites had consensus on the early maturity of new rice line compared to Gohar cultivar and they know this trait along with resistance to lodging is one of outstanding characteristics in this line. The new line cooking is similar to Gohar cultivar and is desirable in terms of cooking quality.
Keywords: Early Maturity, Grain Yield, Rice, Research-Extension