Abstract: Based on the experiment on hybrid rice variety Fengliangyou No.1 with different sowing and harvest dates,the effects of sowing and harvest dates on rice quality were analysed.The results showed that protein component of glutenin and glutamic acid contents were significant at 5% or 1% level between different sowing and harvest dates.With the sowing date postponed,total protein contents of rice decreased,while with the harvest date postponed,total protein contents increased.The change pattern of amino acid was same as that of total protein.The relatively important climate factors upon the main quality traits were analysed.The results showed that albumin,globulin,gliadin and methionine acide were stable to climate,while the total protein,glutamic acid and asparagines acid were sensitive to climate.In Wenzhou region,the sowing date of variety Fengliangyou No.1 could be chosen at on May 26th.The daily mean air temperature was about 25.07 ℃ during filling stage.The whole growing period was about 130 days.Under these conditions,the milling quality,especially head milled rice recover,the protein and its component glutenin and amino acid(except methionine) content were high and the nutrition quality of rice was better.

Key words: Fengliangyou No1, Fengliangyou No1, Protein, Amino acid, Milled rice quality