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浙852是我国第一个采用铯—137γ辐射杂种一代后经选育而成的中熟早籼多抗新品种。自1985年定型以来,在浙、湘、鄂、赣、皖等省试种,表现具有高产、稳产,抗病、抗逆性强,适应性广,米质较好等特点。1989年经浙江省农作物品种审定委员会审定通过,并在长江中下游双季稻区迅速推广应用,1989年推广种植面积达50余万亩。一、选育经过和产量表现1.选育经过:1982年用早籼浙辐802作母本,与南朝鲜籼糯品种水源290杂交,再用铯—137γ射线3万伦辐照F_1代干种子,经多年异地筛选加代,1985年以M_5F_6进入鉴定圃定型。其主要选育过程如图1。2.产量表现:浙852一般亩产400～500
Zhejiang 852 is the first new variety of Indica Indica multi-resistance medium-matured Indica hybrids that was selected from the generation of hybrids of cesium-137γ radiation in China. Since stereotypes in 1985, it has the characteristics of high yield, stable yield, disease resistance, strong resistance, wide adaptability and good quality in Zhejiang, Hunan, Hubei, Jiangxi and Anhui provinces. Approved by Zhejiang Province Crop Variety Approval Committee in 1989 and rapidly popularized and applied in the double cropping rice paddy in the middle and lower reaches of the Yangtze River, the planting area in 1989 was more than 50 million mu. I. Breeding and yield performance 1. Breeding: In 1982, with the early indica rice spikes 802 as the female parent, and South Korea indica waxy varieties of water 290 hybridization, and then cesium -137 gamma ray 3 Wan Lun radiation F_1 generation Seeds, after years of screening and substitutions in different places, in 1985 to M_5F_6 identification nursery stereotypes. The main breeding process shown in Figure 1.2. Yield performance: Zhejiang 852 general mu 400 ~ 500