Chezang Dendup, Sonam Dorji, Sonam Tshomo & Langa Tshering
The GSR varieties are designed for low input production systems of rice under changing climate which are suitable to southern Bhutan where low input rice production under rain-fed condition is widespread. Forty GSR varieties for rain-fed condition were introduced from IRRI and were evaluated following standard variety evaluation system of field crops in Bhutan at ARDC Samtenling from 2013 to 2017. Six lines were selected and advanced as best GSR varieties from evaluation over five years. In 2018, an experiment was conducted to evaluate six selected GSR varieties in RCBD with three replications. Bhur Kambja1 – a popular rain-fed variety was used as local check. Results show that there was no significant differences in the grain yield between the test entries although IR 83142-B-60-B showed highest yield of 4.20 MTha-1. The statistical analysis of yield components also showed no significant differences in the number of productive tillers, number of grains per panicle and days to 50% flowering. However, there was significant variation in panicle length, 1000-grain weight and plant height of the test entries. IR 83142-B-61-B had longest panicle length (24 cm) while Mahsuri had the highest TGW (23.4 gm) among all the test entries. The comparison of length-breadth ratio of grains also showed significant difference between the test entries with all test varieties being slender except Mahsuri which had medium sized grains. There was no significant difference in the maturity period as 50% flowering days of all entries ranged from 95 to 97 days. All the varieties showed consistent yield performance over the years.
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