Abstract: Based on the super hybrid rice ‘Yueyou6135’ field investigate data at different sowing stage from 2011 to 2013, the grain weight was counted once 5 days from head sprouting to ripe period, and the grain filling rates were calculated. Meanwhile, grain filling rates and grained weight models were erected according to every day temperature and sunshine duration. Relationship between rice varieties and meteorological factors and the optimal meteorological condition on rice grouting were determined. The results showed that the relationship grain filling rates and grain weight with temperature and sunshine duration were linear duality function, but the relationship grain filling rates and grain weight with temperature and photoperiod were binary quadratic functions. The relationship between grain filling characteristics with different temperature factors are superior to sunshine duration, the relationship between different temperature factors and temperature and photoperiod with grain weight are superior to grain filling rates. The daily minimum temperature and sunshine duration are important factors to hybrid rice ‘Yueyou6135’. To some extent, it affects the hybrid rich grain filling rates. When accumulated temperature reach 900℃·d and the sunshine duration is close to 300 hours, the grain weight get to maximum value, it show that grain filling process is tend to complete, the grain plumpness gained the ideally. Therefore, the results will offer some theorists’ basis to hybrid rice planting, or making the most of meteorological resources and arrange rational sowing stage.

Key words: Yueyou6135, Sowing stages, Grain filling rate, Grain weight, Accumulated temperature, Temperature and light combination