两系杂交稻生长率的研究

Studies on the Growth Rate of Two-line Hybrid Rice

总结了几年来对两系杂交稻生长率的研究结果，表明两系杂交稻生物学产量以中期生长率最高；全生育期间，干物质呈Ｓ形曲线增加，生物学日产量呈抛物线变化，生育前期和后期增加的绝对量少，中期增长量大。从而论证了充分发挥中期优势对增产的意义。并指出栽培中片面追求“促、控”效应违背了两系杂交稻本身的生长规律，应充分发挥水稻自身的调节功能，维护正常的自然增长。

The Growth rate of two-line hybrid rice was studied through the experiments of different fertilizing methods, fertilizer amount and fertilizing time during 1992～1995 with Peiliangyou Teqing as the main material. The results showed that the growth rate of biomass of two-line hybrid rice was highest in middle stage (20～60 d after transplanting); the dry matter production increased as an S-shaped curve and the daily biomass changed as a quadratic curve during the whole growing period; the absolute increase of biomass was little in the early and late growth stages, but great in the middle growth stage. All of these results indicate that it is important to make full use of the advantage of great production in the middle stage to increase yield. Futhermore, it was pointed out that the cultural model of 'promoting at early stage and controlling at middle stage' violated the natural growing pattern of two-line hybrid rice. Therefore, in the cultural management of two-line hybrid rice, maintaining the natural growing pattern and making full use of the self-adjusting role are very important.