| 【Objective】 The study was to analyze the correlation between meteorological factors and rice grain filling
speed and 1000-grain weight in central Guizhou Province.【Method】Based on the daily meteorological data (wind speed,
precipitation, temperature, sunshine duration, relative humidity and evaporation), grouting speed and 1000-grain weight
in rice grouting maturity period from 2013 to 2017, the variation characteristics of potential evapotranspiration, grouting
speed and 1000-grain weight were analyzed through the trend change rate. With the help of RDA, the correlation between
meteorological factors and yield factors was discussed to further obtain the temperature suitability of rice during grain filling-maturity period.【Result】The results showed that only in 2016, the average daily potential evapotranspiration showed
an increasing trend during the rice grain filling-maturity period. The rice grouting speed curve was single“peak”type in
2013, 2014 and 2017, double“peak”type in 2015, and flat casting type in 2016. From 2013 to 2017, the 1000-grain weight
of rice showed weak variation.【Conclusion】Monte Carlo Test showed that meteorological factors were positively correlated
with grouting speed, and negatively correlated with the change of 1000-grain weight. The lowest temperature was the key factor
affecting the grain filling-maturity yield of rice. From 2013 to 2017, the optimum temperature for rice during grout to maturity
period was between 0.86-0.98, which required abundant heat for growth and development. |
