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    种植技术

    杉木苗育苗技术
    产品名称:
    杉木苗育苗技术
    产品规格:
    杉木苗方法
    产品功能:
    育苗技术

    详细描述

    播种
    播种前要精选种子和消毒。种子消毒可用0.5%的高锰酸钾或1%漂白粉液浸30分钟,或用0.15%—0.3%的福尔马林液浸15分钟,倒去药液,封盖一小时后播种。播种季节以惊蛰到春分为宜。播种方法以条播为好,即按18cm—25cm的距离开沟,沟深1cm,宽2 cm—3 cm左右,将沟用木
    板压实,把种子均匀撒在沟中,每亩播种子10公斤左右,然后再用细土覆盖种子,厚度以不见种子为宜,覆土后再盖草。
    一般每亩施厩肥(腐熟)或火烧土3000~5000公斤,饼肥100~200公斤,过磷酸钙50~100公斤,碳铵25~50公斤。在施肥的同时,还可结合土壤消毒。在作床前敲打土块的同时,可将敌百虫(每亩1.5~2.5公斤)施入土层,这样既可以消灭地下害虫,又能防止猝倒病。作床后,还可以在床面上施撒硫酸亚铁(每亩10~15公斤)使表土酸化,能抑制或消灭病菌。在山区新开辟的圃地可不必消毒。为了消灭种子所带的病菌和预防病害,播种前要进行种子消毒。可用0.5%高锰酸钾或1%的漂白粉浸种30分钟,或用0.15~0.3%的福尔马林浸15分钟,捞出封盖1小时后播种,也可用0.5~1%硫酸亚铁溶液浸种2小时。为了促进杉木种子萌动发芽,可用15~20℃温水浸种18~24小时,捞出后稍加晾干即可播种。如果播种期已迟,可将
    消过毒并用温水浸过的种子置于箩筐内或竹篮内,上覆薄膜置于暖房或温室内,温度控制在20~30℃,保持种子湿润,2~4天后,种子微裂或露白时进行播种,这样出土快。播种方法和播种量:播种方法分条播和撒播2种。条播便于中耕除草,撒播生长均匀,产苗量高。为稀撒育壮苗,多采用条播。条距20~30厘米,播种沟宽2~3厘米,深约1厘米。播种量不宜过多。如种子发芽率在35%以上,条播每亩用5~6公斤;若采用撒播方式,每亩用6~7公斤。播种后最好用过筛的黄心土或火烧土覆盖种子,厚度以不见种子为宜。
    管理
    播种后约一个月,种子先后发芽出土,就要分次揭去盖草,每一次揭去三分之一左右,隔3—5天再去揭去三分之一,3—5天后再揭去三分之一。揭苗后应采取遮荫措施,透光度保持30%—40%,立秋后应适时拆去遮荫棚。刚出土的幼苗要注意防治杉木猝倒病。
    杉木猝倒病防治,用1%—2%有硫酸亚铁溶液,每亩喷洒150斤,连续喷洒4次—7次,每隔7天一次。每次喷洒完后要立即用清水清洗幼苗,以防幼苗产生药害。也可用0.3%漂白粉、1%波尔多液或0.1%—0.5%敌克松喷洒苗木。
    杉苗全部出土后要及时除草松土,整个苗期要除草8次—10次,同时要适时追施速效性肥料,雨后及时清沟排渍,干旱季节及时浇水和抗旱保苗,并分次做好间苗工作。
    杉苗达到二级苗以上壮苗的标准是:茎直而粗,顶芽饱满(菊花头),针叶紫红或灰绿,充分木质化,根系发达,侧须根较多无损伤。苗高大于16cm,根径大于0.3cm,根系长大于15cm,大于5cm的侧根数在10条以上。
    育苗选地
    山地育苗选择背风的半阴坡,或只有半天日照的山窝地,以及坡度平缓的老荒地。土壤要疏松肥沃湿润,呈微酸性(pH4.5~6.5),质地以沙壤土至轻粘壤土为宜,排灌容易,交通方便,无病虫害的地方作杉木圃地。不宜选择排水不良和过于粘重的土壤,避免使用曾培育过松、杉苗多年的老圃地、老菜地及前茬为瓜类、洋芋、蕃茄、烟叶等地作为杉木圃地。
    整地的深度一般以20~30厘米为宜。杉木育苗多采用高床。床面宽100~120厘米,高20~30厘米,床长可根据地形和便于工作来决定。在山地,要横山作床,以保持水土,减少冲刷。苗床两侧打紧,以免落雨后垮塌。床面要平整,土块要敲细。床间除需设步道外,四周还要开边沟,以利排水,在熟土和稻田育苗时,可在床面铺1.5~2厘米的黄心土,以减少病害和杂草。结合挖土耙地,要施足底肥。底肥尽量用饼肥、堆肥、人粪、草木灰等农家肥料。还可施入少量的速效氮肥,如碳铵、硫铵、尿素等。并把磷肥和农家肥混合使用。
    播种时间
    应适时早播,以2月份最好,最迟不超过3月上旬。播种要选晴朗无风的天气。
    除草松土
    幼苗出齐后就应开始除草。除草最好在雨后或灌溉后,连根拔除。从种子出土到苗木出圃,一般要除草10次以上。为了节省劳力,可用30%的可湿性扑草净粉剂或25%的可湿性除草醚、灭草灵等喷洒苗床进行除草。追肥:在苗木不同的生长阶段,应追施不同配比的肥料。生长初期,可第一次施高磷低氮的混合液肥(N:P:K为1:5:1),以促进苗木早期发育生根,增强抗病力。杉苗开始进入生长旺盛期(6~8月份)宜施用速效性高氮肥料(N:P:K为3:1:1)。生长盛期过后(9~10月间),停施氮肥,酌施磷钾肥,以促进苗木木质化,提高苗木抗性和造林成活率。追肥种类以速效性为主,如尿素、硫酸铵、腐熟人粪尿等。
    施用方法
    条播以沟施为宜,施后覆土;撒播的可撒施或喷施,视肥料种类而异。按一
    年生杉苗规格:平均苗高35.5厘米,根径0.53厘米,每亩施肥标准为:氮素12.5公斤,磷素12公斤,钾素11.5公斤。移苗间苗:当幼苗出现真叶后,趁雨天进行移苗,移密补疏,以保证齐苗。补苗后要进行灌溉。间苗可分几次进行。第一次结合移补苗,间去密苗。最后一次应在7月份前后定株。定苗密度,一般每平方米保留100~150株。

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