The super hybrid rice combinations, Liangyoupeijiu, Ⅱyou 7954 and Guodao 1 were used as experimental materials under different transplanting densities, to study the photosynthetic rate and water use efficiency of leaves at different positions during panicle initiation stage under the system of rice intensification.

The result of the field trial indicated that 5%fipronil SC at 60ml/667m2 was effective against Laodelphax striatellus at rice earing stage, the control effect was 97.

The loss of the yield of the r ice irrigated with polluted water at tillering stage is greater than that at ear primordial stage.

Using the temperature data of 32 stations in Zhejiang Province from 1961 to 1996,the spatial and temporal distribution of chilling damage during the “pregnant ear” stage of early season rice was analyzed.