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探讨水稻芽期、苗期、孕穗期、抽穗期受低温危害气温指标的目的,在于掌握水稻适宜播插期,避开不利气温条件的影响,保证安全播种、安全孕穗和安全抽穗,达到双季稻丰产,为生产提供科学依据。试验地点在福州北门省蚕桑研究所冷库。供试品种有四优二号、红410等。采用盆栽,苗期每盆30苗,孕穗期和抽穗期每盆插秧4丛,每丛2～5苗,重复2～4次。当稻株进入不同生育期时,点上记号或挂上纸牌,孕穗期以剑叶与下一叶叶枕距离±3厘米时为标准,注明日期,分别送进不同低温室内处理若干天,然后取出放在室外自然气温条件下生长,并考查其死苗率和结实率。低温室内装有日光灯、白炽灯。光照强度:苗期和孕穗期为350～400勒克斯,抽穗期为6,000～7,000勒克斯。并安放自记温、湿度计各一架。
The purpose of exploring the air temperature indicators of low temperature during bud, seedling, booting and heading stages of rice is to master the suitable sowing date of rice and avoid the influence of unfavorable air temperature to ensure safe sowing, safe booting and safe heading to double season High yield of rice, to provide a scientific basis for production. Test sites in Fuzhou North Gate sericulture Institute cold storage. Test varieties have four excellent two, red 410 and so on. Using potted plants, seedlings per pot of 30 seedlings, booting and heading stage pots transplanted 4 plexus, each 2 to 5 seedlings, repeat 2 to 4 times. When the rice plants enter different growth stages, they will be marked or hung with playing cards. At the booting stage, the distance between the flag leaf and the next leaf pillows ± 3 cm is taken as the standard, the dates are indicated, and the seeds are respectively sent to different low temperature indoor processing days, Then removed and placed on the natural outdoor temperature growth conditions, and test its dead seedling rate and seed setting rate. Cold room equipped with fluorescent lamps, incandescent lamps. Light intensity: 350-400 lux at seedling and booting stages and 6,000-7,000 lux at heading stage. And placed self-record temperature, hygrometer each one.