自一九七三年以来,我场大力开展水杉扦插育苗,特别是秋插,收到了良好的效果,扦插成活率达90％以上。下面就秋插一些技术问题,谈点体会。 秋插,也称近熟枝扦插。在立秋至处暑期间(即8月上旬—9月中旬)用半木质化的嫩枝(近熟枝)进行扦插。此时气温在25℃左右,插穗细胞活泼,再生力强,插时气温较高,易生根。 一、苗床准备 根据水杉生长和扦插初期喜湿怕涝的特点,扦插圃地要选择近水源、平坦、灌排方便、土壤肥沃湿润,透气良好的砂质壤土。插前半个月进行深翻(50厘米),施足基肥(河泥、堆肥或粪肥),施用饼肥或厩肥必须充分腐熟撒匀。施肥标准为:饼肥每亩300—400斤;猪灰或人粪每亩100担。有地下害虫危害的圃地可结合深翻整地每亩施用6％可湿性粉剂5—6斤铺撒,杀除地下害虫。 苗床要求窄厢短床(苗床宽1米,长10米,沟深10—25厘米,沟宽50厘米)。砂壤土宜浅沟平床,沟深10厘米;粘土水稻土宜深沟高床,沟深25厘米。挖出的沟泥堆放在 Since 1973, my field vigorously carry out cutting seedlings planted Metasequoia, especially Qiu inserted, received good results, cutting survival rate of 90%. The following insert some technical problems in autumn, talk about experience. Autumn inserted, also known as near ripening cuttings. In the autumn to summer heat (that is, in early August - mid-September) with semi-lignified shoots (nearly mature branches) for cutting. At this time the temperature is about 25 ℃, cuttings lively cells, strong reproductive power, higher temperatures when inserted, easy to root. First, seedbed preparation According to the characteristics of Metasequoia growth and early wet cutting fear of waterlogging, cuttings to choose near water sources, flat, irrigation and drainage convenience, fertile soil moist, well-ventilated sandy loam. Submerged half a month before the deep turn (50 cm), apply foot-based fertilizer (river mud, compost or manure), the application of cake or manure must be fully decomposed and dusted. Fertilization standards: cake fertilizer 300-400 pounds per acre; pig ash or human dung 100 per mu. Ground pests with harmful hazards can be combined with a deep turn to apply 6% per mu of wettable powder 5-6 kg spreading, killing underground pests. Seedbed requirements narrow car short bed (bed width 1 meter, length 10 meters, ditch depth 10-25 cm, width 50 cm). Sand loam shall shallow flat bed, ditch depth of 10 cm; clay paddy soil should be deep ditch, 25 cm deep groove. Dredged ditch mud piled up