(mean temperate cultivars) compared to 249 g m −2 (tropical cultivars), which was due to having lower values of pods, seed number and TDW. In addition, the occurrence of shriveling and smaller seed size compared to plants grown in their region of origin was considerably evident in Japanese cultivars. To account for the difference of growth duration, a maturity-corrected index for yield and relevant variables was calculated to consider the amount of incident solar radiation. The yield index for all tested cultivars ranged from .49 to 1.48, and Japanese cultivars showed the lowest yield index (.67), followed by US cultivars (.87), whereas tropical cultivars had index means from 1.05 to 1.20. Although they were both of temperate origin, Japanese cultivars tended to show a lower index than US cultivars. The tendency was similar for TDW and node number. The poor performance of temperate cultivars even after correction suggests that there is a genetic variation of adaptation to a tropical environment independent of growth duration. Additionally, there was considerable performance variation within temperate cultivars.
Rice is the number one staple food crop, being eaten by almost all the population in Indonesia. Jajar Legowo Super (Jarwo Super) technology as an approach to improve rice productivity consists of various components of technologies. This study attempts to demonstrate the importance of farmer group empowerment and the implementation of Jarwo Super technology as a strategy to improve rice productivity. A two-year study from 2019 – 2020 was conducted in Cibadak Sub-district, Lebak District, Banten, Indonesia. We combined specific components of rice technology in Jarwo Super, and implemented it in the farmers’ fields. Scheduled assistance through farmer field school (FFS) and field inspections were regularly conducted. The individual farmers’ performance in the implementation of technology and their participation in the FFS were evaluated. Our study showed that the implementation of Jarwo Super significantly improved rice productivity by 34.7% and 35.5% in 2019 and 2020, respectively, as compared to that of regional productivity. The yield performances were highly correlated with both the components of technology as well as farmers’ participation in FFS. We concluded that intensive and continued assisting through extension activities is a key point in delivering technologies to improve rice productivity for better food security.
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