Fissured grain and head rice yield of crops harvested manually or by combine at different ripening stages in Cambodia
| Autor: | Nob Lina, Som Bunna, Sareth Chea, Jaquie Mitchell, Chao Sinh, Makara Ouk, Shu Fukai, late Hourn Sereyvuth, Pao Sinath, Yim Somaly, Hel Sreypov, Yong Rumduol |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
0106 biological sciences
head rice yield combine Broken rice Ripening 04 agricultural and veterinary sciences Biology lcsh:Plant culture 01 natural sciences Agronomy grain fissures Yield (wine) 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Head (vessel) lcsh:SB1-1110 Rice harvesting time Agronomy and Crop Science 010606 plant biology & botany |
| Zdroj: | Plant Production Science, Vol 22, Iss 1, Pp 88-97 (2019) |
| ISSN: | 1349-1008 |
| Popis: | Combine has been well adopted by smallholders in lowlands of Cambodia and is contributing to the development of mechanized rice production for commercial purposes. Broken rice is a major issue for the commercial rice product, and fissured grain at harvest leads to broken rice and lowers head rice yield (HRY) during milling. Factors that determine grain fissures and broken rice were obtained from three studies: an on-farm study of fissured grain, a research station experiment of fissured grain and broken rice harvested at different ripening stages and a mill study of fissured and broken rice during drying and milling processes in Cambodia. There was significant variation in fissured rice percentage among 20 farms sampled, and the fissured grain was negatively correlated with grain moisture content at harvest. Time of harvesting was crucial, as delay in harvesting after 25 days after flowering (DAF) often resulted in lower grain moisture content and higher fissured grain, which subsequently reduced HRY. However, the optimum time of harvesting varied across four seasons for crops harvested manually or by combine. In some years, crops harvested at 35 DAF had rather low per cent fissured grain with subsequently high HRY, this may have been associated with slightly lower temperatures. The mill study showed that fissured grain developed during the drying, storage and milling processes. It is concluded that while grain moisture content at the time of harvest may be used as an indication of subsequent HRY, the latter was more strongly related to fissured grain at harvest. |
| Databáze: | OpenAIRE |
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