The highest record yields of Japonica rice [Oryza sativa] obtained in Yunnan province, China
1996
Amano, T. (Kyoto Prefectural Univ. (Japan). Faculty of Agriculture) | Shi, C.J. | Qin, D.L. | Tsuda, M. | Matsumoto, Y.
The highest record yields of the Japonica rice in Binchuan county, Yunnan Province, China were 1.664 to 1.982 t/ha using Yu-Za 29(F1 hybrid variety). The spikelet number per square m was 71,000 to 87,000. The thousand grain weight of brown rice and the percentage of ripened grain were 23.1 to 23.5 8, 76.0 to 76.2%, respectively. Although the average daily incident solar radiation during the rice growing period in Binchuan(19.3 MJ/square m/day)was 20% higher compared to the Japanese mean value, the high yields of Yu-Za 29 were attributed principally to technical effects such as breeding and manuring practices with high pesticide levels. Disese and insect injuries were more frequently observed in the dense planting than in the sparse planting. The high yielding technology in Binchuan should be reexamined with regard to the planting density.
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