强化栽培条件下水稻的根系特征及其与产量形成的关系

The Characteristics of Roots and Their Relation to the Formation of Grain Yield under the Cultivation by System of Rice Intensification (SRI)

以协优527为材料,研究了强化栽培条件下水稻的根系特征及其与产量形成的关系。结果表明,与常规栽培相比,强化栽培能明显增加从分蘖至成熟各生育时期的单株根系干重,降低齐穗后根系中可溶性糖含量,提高生育后期根系的生理活性及磷含量,特别是在籽粒灌浆结实的关键时期,SRI栽培的根系伤流强度明显高于接常规栽培。因此,强化栽培可以延缓后期根系及叶片衰老,提高结实率及千粒重,进而提高产量。

The characteristics of roots and their relation to the formation of grain yield under the cultivation by the System of Rice Intensification (SRI) were studied, using the highyielding hybrid rice combination Xieyou 527 as the material. The results showed that compared with the traditional cultivation (check), SRI increased markedly the root dry weight per plant in the whole growing period from tillering to ripening stage, decreased the soluble sugar content of roots after full heading stage and increased the physiological activity and phosphorus content of roots in late growth stage. Especially, the bleeding intensity of root system of SRI was obviously higher than that of the traditional cultivation in grainfilling stage. Therefore, SRI can delay the aging of roots and leaves in late growth stage, increase seedsetting percentage and grain weight and finally raise grain yield.