The optimum harvesting time for rice seed production using a combine
1989
Yoshino, M. (Fukuoka-ken. Agricultural Research Center, Chikushino (Japan)) | Matsue, Y. | Harada, K.
(1) The seed moisture content was reduced rapidly from 10-8 days to 4-3 days before the maturing stage. The decline was slow until 8-9 days after the maturing stage. (2) Grain yield of Nipponbare until 3 days before the maturing stage differed in 1987 and 1988. In 1987, grain yield of Nipponbare at 9 days the maturing stage was 80.7% of yield of the maturing stage. In 1988, it was above 97% from 9 days to 8 days after the maturing stage. Grain yield of Chikugonishiki was above 95% from 8 days to 9 days after the maturing stage. There was only small difference in 1000-kernel-weight of winnowed paddy both for Nipponbare and Chikugonishiki from 10-9 days before to 8-9 days after the maturing stage. (3) A germination percentage of Nipponbare was lower in 10-4 days before the maturing stage and it was about 98% after the maturing stage. (4) A ratio of hull-cracked rice and hulled rice to the normal was increased from 10-8 days and 8-9 days after the maturing stage. It dropped temporarily at 3-5 days after the maturing stage. (5) Accumulated temperature from heading time to harvesting was 940-1060 degrees centigrade for Nipponbare and 950-1085 degrees centigrade for Chikugonishiki. (6) For seed production, Nipponbare, early maturing cultivar, should be harvested from 3 days before to 3 days after the maturing stage and Chikugonishiki, late maturing cultivar, should be harvested from the maturing stage to 5 days after it
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