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刺楸是速生珍贵用材树种,种子成熟后,种胚发育不完全,需要经过生理后熟才能发芽。采用一般的种子催芽方法,播种当年出苗率很低。我们苗圃经过多年试验,对种子进行变温催芽,种子发芽率达60％以上,当年播种当年出圃,苗木产量高,质量好。 刺楸种子采回后,将果肉搓掉,用清水洗净,经水选后除去秕粒,再将种子与3倍湿沙混拌均匀,堆在库房地上,使种胚在10～15℃的条件下生长分化。当10月中下旬温度逐渐下降时,再将混沙的种子转放窖内。 贮藏窖要选在地势高燥、背风向阳、地下水位低的地方。窖深1米,窖底要平。窖底先铺20厘米河卵石,再铺10厘米厚的河沙。然后将堆在库房内混沙的种子放入窖内,厚50厘米,上覆20厘米河沙与地面相平,再培土成屋脊状,四边挖好排水沟,窖内每1米远放1个秫秸把,作通风孔,并在窖的中间放1根2米长的塑料管,中间吊1根温度计,以便随时检测窖内温度。1～2月份,窖内种沙温度要保持在-5～5℃,种沙温度超过5℃时要及时起窖,防止种子霉烂。 种沙起出后,在地势高燥,背风向阳的空地,挖深15厘米,宽50厘米的催芽池,把混沙的种子放入池内,上面覆盖塑料薄膜。池内种沙温度保持在15～25℃。每天要翻动几次,保证种子湿润,中午要通风30分钟。干燥时要适当喷水,晚上要堆起覆盖。当种子有20％裂嘴时进行?
Catalpa bungei is a fast-growing precious timber species, seed maturity, embryo development is not complete, need to go through physiological ripening to germinate. Adopt the general method of seed germination, seeding the very low emergence rate. After years of experiments in our nurseries, the seed germination temperature, seed germination rate of 60% or more, then out of nursery planting the year, nursery stock high yield and good quality. After collecting the seeds of Catalpa bungei, the flesh is rubbed off, washed with water, removed from the water by pelleting, and the seeds are mixed well with 3 times of wet sand and piled up on the floor of the storehouse so that the embryos are stored at 10-15 ° C Under the conditions of growth and differentiation. When the temperature gradually declines in mid-to-late October, the sand-mixed seeds are then transferred to the pit. Storage cellar to be selected in the high terrain, leeward sunny, low groundwater level. Depth of 1 meter cellar, bottom of the pit to be flat. Bottom of the first pit shop 20 cm pebbles, then shop 10 cm thick river sand. Then pile in the warehouse sand mixed seeds into the cellar, 50 cm thick, 20 cm above the river sand and ground level, and then cultivate the ridge into a house, dug ditch on each side, the pit 1 meter away 1 A straw as a vent, and in the middle of the pit put a 2-meter-long plastic tube, hanging a thermometer in the middle, in order to detect the pit temperature at any time. From January to February, the sand temperature in the cellar should be maintained at -5 ~ 5 ℃. When the sand temperature exceeds 5 ℃, it should be pitted in time to prevent mildew of seeds. Sapling out, in high terrain, leeward sunny open space, dug deep 15 cm, 50 cm wide germination pond, the sand mixed seeds into the pool, covered with plastic film. Silt temperature in the pool is maintained at 15 ~ 25 ℃. Turn several times a day to ensure the seeds moist, ventilation for 30 minutes at noon. Sprinkle water when dry and stack up at night. When the seeds have 20% cracking mouth?