关键词: 免耕, 常规耕, 水稻, 根

Abstract: During 1986-1991, based on field trial and pot experiment, the characteristics of growth, development, accumulation and tromsformation of plant dry matter and other physiological indexes related to yield of paddy rice on nontillage and conventional tillage condition following rice seedling bed stubble were stuied.The yield of nontillage is 654kg/ha, higher than that of conventional tillage (increased by 9.87%), Its physiiilogical basses are mainly as follows;at all growth stages, dry matter, number, total length per plant of root system under non-tillage were higher than that of conventional tillage, the activities of root system under nontillage condition were stronger (stronger recuperative ability, bigger surface area, higher a-NA oxidative ability, wider and deeper distribution and stronger absorbing ability to 32p);Also rice plant under nontillage condition has above ground parts superiority, including accumlation and distribution of 32p, accumlation and transformation of plant dry matter etc.As 32p, accumlation and transformation of plant dyrmatter etc.As the peoperties of plant above ground parts, the tillering speed at earlier stage and the effective panicle number per unit area of nontillage were faster and higher than convertional tillage.

Key words: NOTILLAGE, CONVENTIONAL TILLAGE, LOWLAND RICE, ROOT