Characteristics of seedling emergence and dry matter production of direct-seeded rice [Oryza sativa] cultivars for whole-crop silage in Tohaku region [Japan]
2006
Yoshinaga, S.(National Agricultural Research Center for Tohoku Region, Morioka (Japan)) | Nagata, K. | Fukuda, A.
We examined the seedling emergence and the characteristics of dry matter production in direct-seeded rice for whole-crop silage (RWCS) in the Tohoku region in order to obtain available data for establishment of the cultivation. It was shown that using seeds stored at 20 deg C for 3 days after they were coated with an oxygen supplier was effective for uniform emergence and a higher emergence rate in the tested cultivars. Dry matter production at yellow-ripe stage and grain yield of the direct-seeded RWCS were lower than those of transplanted RWCS. In direct-seeding, greater dry matter production was obtained in cultivars that showed longer growth period, larger leaf area during ripening period, and lower specific leaf area, which results in high leaf-blade nitrogen content and a lower extinction coefficient. The newly developed RWCS cultivar "Bekoaoba" and the spikeletdecreased mutant "RM645" were considered more suitable for direct-seeding cultivation, because they showed higher lodging resistance in addition to these desirable characteristics in dry matter production.
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