推荐回答(4个)
答:影响枣树栽植成活率的因素很多,如苗木的质量、栽植的时间、栽植技术、栽后的管理等,为提高枣树栽植成活率应做好以下几点:
①为实现枣树的无公害高效栽培,枣苗一定要选择品种纯正、根系完整、无机械损伤、无检疫对象的新鲜优质壮苗。栽前根系要用水浸12小时以上,使根系吸足水分,并对根系进行修整,剪去脱水、腐烂及劈裂等不良根系,再用ABT生根粉10~15毫克/千克的溶液浸根1小时或用ABT生根粉1000毫克/千克速蘸5~10秒,然后即可栽植。为提高成活率可将苗木的二次枝部分或全部剪除,中心主枝延长头剪留在壮芽部分。笔者实验,在一切条件均相同的情况下,枣苗剪除二次枝和中心主枝延长头与不剪的比较,成活率可提高46%。
②栽植技术。在已整好地的地块上,根据枣树根系的大小在定植点上挖植树坑,坑的大小以保证根系在坑内舒展为宜,然后放入处理好的枣苗,苗木阳面栽植时仍朝阳面,苗木的株行间对齐,使行内、行间成直线,然后填土,边填土,边提苗,使苗木根系在土内舒展,然后踩实,苗木埋土可略高于原苗木土痕,(浇水后土面下沉至原土痕为宜),栽后浇一透水,水渗后覆地膜,以保墒和提高地温,利于根系生长。覆膜面积,每株苗木不少于1米2。如果不覆地膜,可在水渗后,适时进行锄划保墒。据笔者调查,春天覆地膜耕层地温可提高2~4℃,土壤含水量提高30%左右,枣树成活率高、发芽早、当年生长量大。栽后苗木剪口要涂漆、树体喷石灰乳,防止苗木失水和日灼,有利成活(石灰乳配制方法:优质生石灰10千克+食盐200克+水胶100克+水40千克,搅成乳状即可)。
③枣树定植后管理。枣树定植成活后,可在夏季高温来临之前撤去地膜,如土壤墒情不足,可进行灌水增加土壤湿度,浇水后要及时进行中耕除草保墒,促进枣树生长。盐碱地上的枣树,如水质不好,在一般的情况下不要浇水,可进行多次中耕,减少土壤返盐。苗木栽植后也可喷100~150倍的羧甲基纤维素或高脂膜,减少苗木水分蒸发,有利枣树成活。枣树成活后新萌生的枣头和二次枝一律不动,任其生长,但要注意与中心枣头竞争的枝头,必要时进行适当抑制竞争枝以扶持中心枣头的旺盛长势。生长期要注意病虫防治,防治方法参照本书的病虫害防治部分。结合喷农药可进行叶面喷肥,生长前期可用0.2%的尿素液进行叶面喷肥2~3次,促进枣树的营养生长,生长后期可用磷酸二氢钾0.2%的溶液进行叶面喷肥2~3次,提高植株的木质化程度,有利于枣树安全越冬和来年的生长、结果。对没有成活的枣树,来年要及时补栽,以保持枣园林相整齐,便于管理。
枣树春秋均可栽植,但以春季栽植为主。枣树苗多是从老树侧根上生长出来的;故而其须根稀少,因此,枣树移栽不易成活。难怪有:“精心栽枣枣不活,随意插柳柳生芽”的农谚。
枣树难栽活的主要原因是人们习惯同其他树木同期栽种,实质上枣树栽种宜晚不宜早,为提高树苗的成活率,尤其是今年春寒严重,更不易早栽,应比一般的树木晚栽一到两个月。有人对枣树苗进行了不同时期的移栽试验。结果是:枣树苗在萌芽期移栽成活率最高,可达90%以上。
枣树芽期移栽为什么易成活呢?因为枣树生根、发芽要求的温度较高,若春季过早栽植,树干会失水过多根系难以补充,影响成活。而芽期移栽时枣液已开始流动,树体开始生长,受伤根系容易恢复再生,地下部营养及时运输到地上部,易于成活。故农谚有“柳栽棒锤枣栽芽”的说法。移栽时应注意以下几点:
1、枣芽露出一厘米移栽最为适宜。
2、移栽前五天将枣苗浇水一次。
3、移栽的枣苗要健壮,拐子根要在20厘米以上,并尽量多带须根。
4、栽前剪去烂根、裂根,尽量减少伤口面积,然后用0.005%~0.01%奈乙酸或用0.2%ABT生根剂浸泡根系5~6小时,取出后趁湿用优质草木灰蘸根栽植,草木灰中的钾可提高根的抗性,激活根内某些酶的活性,从而有利于生根。
5、运输时不要碰伤根系和枣枝,最好用塑料布包裹根系,以防风吹日晒,摩碰根皮,确保根系完好湿润。
6、定植坑至少要70厘米见方、分层复土踏实再进行浇水,待水渗后培土堆,以防干旱和风吹摇晃影响成活。
7、栽植时对粘性较大的土壤,可在根系周围搀沙或草木灰,以提高土壤氧气含量。填土后灌水,上面铺沙或覆膜,以蓄热保墒,提高地温。
8、栽植后树枝的方向最好和移栽前保持一致。
9、移栽枣树时,可在事先挖好的树坑内放上一把谷子,这样可提高枣树的成活率。因为谷子在树坑里发芽后能紧紧把住枣树根,减少树干摇动,有利于新根生长发育,另外谷芽腐烂后还可作为枣树新根生长发育的营养。
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