两系法杂交粳稻70优9号主要栽培特性和高产技术

70优9号(7001S/皖恢9号)系两系法早熟晚粳型杂交组合,全生育期131(双)～161(单)天,与常规晚粳相比,分蘖力较强,成穗率不高(72.94%),穗大粒多116.3(双)～139.2(单)粒],结实率较低73.45(双)%～74.92(单)%],灌浆历期长46.1(双)～55(单)天],需肥量中等偏上,吸肥力较强。高产技术:适时适量播种,单晚4月25日～5月初、双晚6月18～20日播种,亩播种量不超过15公斤,培育带大蘖壮秧;强调施足基肥,基肥总纯氮量7～8公斤,分别占单、双晚总施氮量的55%、75%,适当控制分蘖肥,后期施穗粒肥;适时轻烤田,养好老稻。

The Main Cultural Characteristics and High Yield Techniques of Two--Line Japonica Hybrid Rice Combination"70 You 9".

"70 You 9"(7001S/Wanhui 9) is a two-line hybrid rice combination which belongs to early maturing late japonica rice. Its whole growth period duration stands 131 (late season cropping (LSO)—161 (single season cropping (SSC)) days. Compared with conventional late japonica rice cultivar,the tillering ability of"70 you 9"is stronger,the rate between panicles and tillers lower (72. 94%),the grain number a panicle much more (116. 3 (LSC)—139.2 (SSC) grains) ,the grain setting lower (73.45 (LSC) —74.92 (SSC)%), the grain filling stage longer (46. 1 (LSC)-55 (SSC) days),the fertilizer requirement intermidiate or up,the ability of absorbing fertilizer stronger. The key cultural methods are also studied in this paper.