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水稻灌浆前期平均气温在26℃以上,或低于21℃,光照不足,会使多数品种稻米的出糙率和精米率降低1～3％,整精米率减少3～10％,严重者达10％以上。稻米的直链淀粉含量和胶稠度随灌浆期平均气温的变化因种而异;对光强的反应,品种间亦不相同。糙米的蛋白质含量与平均气温的关系视不同年型而异,灌浆期太阳辐射强,多晴天少雨,日较差大的年份,随平均温度的升高而增加,反之,则随温度的升高而减少;光强减弱,使杂交籼稻的蛋白质含量显著降低。
Rice pre-grain average temperature above 26 ℃, or less than 21 ℃, inadequate light, most varieties of rice will reduce the roughness and milled rice rate of 1-3%, reducing the rate of rice 3 to 10%, in severe cases up to 10 %the above. The amylose content and gel consistency of rice varied with the average temperature during grain filling stage. The response to light intensity was also different among varieties. The relationship between protein content and average temperature of brown rice varies with different years. The solar radiation intensity during filling period, the more sunny and less rainy days and the worse daily difference increase with the increase of average temperature. On the contrary, with the increase of temperature, But decreased; light intensity decreased, so that the indica hybrid rice protein content decreased significantly.