早晚稻混栽(播)技术体系及综合效益研究——Ⅱ.混栽条件下早晚稻品种的生育特性及与产量的关系

MIXED CULTURAL SYSTEM OF EARLYRICE AND LATE RICE AND THEIR COMPREHENSIVE BENIFIT——Ⅱ.CHARACTERISTES OF GROWTH AND DEVELOPMENT OF MIXED COLTURAL RICE VARIETIES

为了便于选用适宜的早晚稻品种,在前报的基础上,本报从品种的生长发育特性上,阐明了混栽高产的品种适宜生育期以及混栽条件下品种生长发育的变化特点.并得到如下结果:(1)混栽的早种品种在长沙地区宜用中熟品种,在郴州地区宜用迟熟品种;晚稻只能用感光性较强的晚稻品种,9月15日左右齐穗.晚稻的生育期太短,则穗数不足,不易提高产量.(2)混栽延长了晚稻品种的生育期.(3)混栽晚稻的总叶数,较之同期播种单插者多1.6叶,比连作晚稻栽培者多3～4叶.(4)混栽晚稻有2次分蘖高峰.(5)混栽晚稻郴晚3号的穗型比单作的小.

Mixed-culture of both early rice and late rice(MCR)is a high-yield,economic and energy saving technique.On the background of the former publication,this paper ex-plain(?)how to choose the high yield varieties of early-and late-rice and their character inMCR.The results were as the following:(1)In MCR,early-rice should be mid-maturity vari-eties in Changsha,and late-maturity ones in Chenzhou;late-rice variety should only be theone which is more sensitive to photo(e.g.Chenwan 3).Its heading stage is about Sep.15.For shorter growth duration of late-rice,it is not easy to increase its yield.(2)Full heading(?)age of early rice is earlier in MCR than in double rice.Different ripening stage of early sea-(?)n in MCR could influence the full heading stage of its late season.the growth duration ofla(?)e rice is longer in MCR than in one season rice at the same sowing time.(3)Total numberof leaves of late rice is 1,6 leaves more in MCR than in double rice.(4)The tillering of earlyri(?) in MCR was similar to tht in common culture,but for late rice,there were two peaks of(?)llering.(5)The ear of late rice(Chenwan 3)in mixed-cultune is smaller than that of in sin-gle culture.