Evaluation of SterileType Rice Cold Injury in Heilongjiang Province in 2009
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Abstract:
A phased low temperature occurred in the summer of 2009 in Heilongjiang Province, resulting in a steriletype rice cool injury, during which the field crops had varying degrees of delayedtype cool injury and fertility postponement. Through calculating the daily cool accumulated temperature according to its relationship with the rice emptygrain rate and the probability distribution of the number of sensitive rice groups during sensitive periods, the rice emptygrain rates and loss rates caused by the steriletype rice cold injury are assessed by means of the daytoday and hourtohour mean temperature from June to August 2009. On the basis of the clear physiological responses of rice to low temperature and cool injury, the assessment method is described, from the view of the dynamic temporal changes of rice during sensitive stages, which is superior to the assessment methods of adopting average temperature or temperature anomaly as indicators and can improve the precision and quantification of assessment.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.