关键词: 自由放养, 设计饲养, 吃饱度, 吃好度, 豆科牧草

Abstract: Different nighttime temperature was established in two glasshouses to study the effects of nighttime temperature increase (NTI) at different growth stages on the dry matter production and nutrient absorption of doublecropping rice. The NTI from seeding to panicle differentiation promoted the dry matter production of early rice but suppressed that of late rice, whereas the NTI from panicle differentiation to heading exerted definite negative effects on the dry matter accumulation of both early and late rice. Post-heading NTI had less effects on the dry matter production of early rice, but slowed down the translocation of assimilates in early rice stem and sheath. On the contrary, postheading NTI increased the dry matter production of late rice, and promoted the translocation of assimilates in late rice stem and sheath. The NTI before panicle differentiation improved the root activity and nutrient accumulation of early rice but did the opposite to late rice, and the NTI from panicle differentiation to heading was not favorable to the nutrient accumulation of both early and late rice. The NTI at filling-ripening stage induced the root aging of early rice, but promoted the root activity of late rice. This study proved that the NTI at different growth stages of doublecropping rice had different effects on the dry matter production and nutrient absorption of early and late rice.

Key words: Extensive grazing, Designed feeding, Eating-full, Eating-well, Legume forage