Effect of meteorological condition during ripening on the grain shattering of rice plant

Shin, J.C.; Kwon, Y.W. . Coll. of Agriculture, Dept. of Agronomy; Chung, C.J. . Coll. of Agriculture, Dept. of Agricultural Engineering

Effect of meteorological condition during ripening on the grain shattering of rice plant

1982

Shin, J.C. | Kwon, Y.W. (Seoul National Univ., Suweon (Korea R.). Coll. of Agriculture, Dept. of Agronomy) | Chung, C.J. (Seoul National Univ., Suweon (Korea R.). Coll. of Agriculture, Dept. of Agricultural Engineering)

The present study was done to determine the effect of meteorological condition during ripening on the grain shatterability of rice plants at harvest. Different meteorological conditions were obtained by shifting transplanting timing of 40 days old rice seedlings 4 times with a 15 days-interval. Grain shatterability was measured as tensile strength of rice grains: it varied within a range of 214g. to 251g. in a practically non-shattering Japonica variety 'Jinheung' and 127g. to 204g. In view of field loss of rice, the variation in tensile strength with time of transplanting and harvest did not matter in Jinheung. In Taeback the tensile strength was positively correlated with mean, maximum and minimum air temperature and relative humidity during a certain period of grain ripening, especially 30 days before harvest, but diurnal range of air temperature showed a significant, negative correlation with it. The tensile strength seemed to be more closely related with minimum air temperature. Meteorological effect on grain shatterability may vary with variety, but temperature regime during ripening appears to play a major role among the meteorological factors in easy shattering and more thermophilic Indica x Japonica varieties: the lower the temperature, the greater the shatterability

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