无土栽培技术：无土栽培技术的介绍

植物图片 2019-06-20 11:06

无土栽培即不用土壤，用溶液培养植物的方式，包括水培和沙培。19世纪中，W．克诺普等发展了这种方法。到20世纪30年代开始把这种技术应用到农业生产上。在二十一世纪人们进一步改进技术，使得无土栽培发展起来。下面我们一起去了解一下无土栽培技术吧！

无土栽培技术

无土栽培技术：

一、主要技术方法

1、秸秆栽培基质的发酵。

秸秆堆腐前的准备：

（1）作物秸秆可采用小麦秸、玉米秸等作物秸秆，秸秆量应大于栽培槽体积的2倍，如通常一个标准大（666．7平方米）种植樱桃番茄时，栽培槽的体积约20　立方米，准备小麦秸的体积40立方米以上，先将秸秆碎，长度小于4厘米，然后用水浸润备用。

（2）采用秸秆复合微生物制剂堆腐发酵秸秆。

（3）牛粪4立方米，在秸秆堆腐前一周，与秸秆腐熟菌掺混，使秸秆腐熟菌在牛粪中扩繁。

（4）尿素的用量约为秸秆量的0．5％，40　立方米秸秆需25千克的尿素。

秸秆堆腐的方式：秸秆堆的底宽2米，高度1．8～2．0米，长度不限。每铺20厘米秸秆，撒一层掺有秸秆腐熟菌的牛粪和适量的尿素，若秸秆浸润的水不足，再喷洒适量的水，以用手紧握秸秆，指缝间有水被挤出为度。此法将秸秆一直堆到1．8～2．0米的高度，建堆完成。然后覆盖塑料膜，减少堆内水分蒸发。2～3天后，堆内气温可达70°c以上；15天左右进行翻堆，将边沿部位的秸秆翻入堆中间，使秸秆与牛粪进一步混匀，若秸秆干燥，可适量补充水分；翻堆后，再堆腐15天左右，秸秆半腐熟，已没有了韧性，手握既断，c／n比在30～40之间，即可作为无土栽培的基质使用。

2、栽培操作技术。

（1）栽培槽：栽培槽采用地挖沟槽铺塑料膜的方式。以樱桃番茄为例：樱桃番茄采用大小行种植，行距60厘米～70厘米，单行挖栽培槽，栽培槽的形状为三角形，上口20厘米，深度25厘米，沟底要平，避免局部积水；在栽培槽内，铺0．1毫米的塑料膜；在塑料膜上填充发酵秸秆做基质，用脚踏实；定植樱桃番茄苗，株距35厘米。

（2）安装滴灌设备：滴灌设施对无土栽培非常重要，是供给无机营养和水分的必须设备。主要滴灌设备包括动力设备、肥料罐、过滤器、水表、支管和毛管。动力设备包括水塔、集中供水的变频潜水泵等，在地下水位较浅的黄泛平原地域，一个大棚内可打一眼塑料软管的水井，用自吸泵做动力即可满足一个大棚滴灌的压力；肥料罐是专门设计的，可减少水压损失和解决肥料堵塞过滤器的问题，已获国家实用新型专利授权；支管可采用直径32～40毫米的聚乙烯管；毛管的滴头间距以20厘米为好，滴头的间距近，湿润秸秆基质的点多，利于蔬菜的根系吸收。滴灌管道的铺设，支管平行于大棚的后墙，最好在中间断开，用三通与肥料罐连接，使水流从中间向两端分流，整个滴灌的压力较均匀；每行铺设一根毛管，使毛管尽量在栽培槽的中间，滴头面向上，可减少滴灌的堵塞。

（3）营养液的管理：研究发明了适合于该栽培系统的营养液管理方法，采用营养液肥料分组分别直接加入到基质的方式，改变了传统营养液的概念和管理方法。传统的营养液的配制是将大、中、微量元素肥料，溶解在一起，由于北方的地下水普遍偏碱，在配制过程中易产生化学沉淀，通常须用酸调节营养液的ph值，农民较难掌握；解决化学沉淀还有用将重金属离子络合的方式，其成本较高；营养液的问题，成为无土栽培技术推广的一个主要瓶颈口；再者营养液配制池的投资也较高。本技术采用营养液肥料分组分别直接加入到基质的方式，将可形成化学沉淀的肥料分开，先将一组肥料加入肥料罐内，在滴灌过程中，将肥料溶解滴入基质，当其充分溶解完后；停下滴灌，加入另一组肥料，直至滴灌结束。

无土栽培技术

营养液的管理方法：定植初期，不用滴灌供应营养液，蔬菜的根系很小，多数滴头的营养液不能被根系吸收，造成浪费，可用水桶溶解一定量的氮磷钾肥料，浓度在1克／升左右，人工浇在苗的周围，每天一次，连续10天左右，根系基本连接后，正常使用滴灌供给营养液；滴灌供给营养液初期，由于苗较小，耗水耗肥量少，每天滴灌0．5立方米的水肥，上午和下午各一次，每次加一组肥料；在秋、冬天依据苗情和天气，通常每天的灌水量掌握在1立方米左右，在晴天的上午滴灌，阴天不灌水；灌水量的大小，可通过观察栽培槽内的营养液积存情况而定。春天的气温高，光照充分，樱桃番茄生长量大，滴灌水肥量，每天在1．5～2立方米。

3、栽培效果。

本技术栽培的樱桃番茄较土栽的含糖量提高26．3％。味道纯正，酸甜可口，余味清香，口感较土栽明显得好；减少农药用量，农药用量为土栽的1／4；节水省肥，每棚用水150立方米，用肥款1500元／棚，肥料投资较土栽减少350元／棚左右；产量基本持平，整体效益增加20％以上。

二、技术优点

1、栽培槽采用地挖沟槽铺塑料膜的方式。其优点：地挖沟槽可以使栽培基质的气温较稳定，比地上或半地上永久性砖混结构的栽培槽，基质的昼夜温差要小得多，避免冬天夜间基质气温过低，对根系造成伤害。

2、栽培基质采用经过堆腐的作物秸秆。其优点：作物秸秆在我国资源丰富，价钱低廉，农民不花钱或少花钱，就可用上秸秆基质；秸秆基质在使用过程中，经过微生物分解产生co2，起到co2气肥的作用，经测定秸秆基质无土栽培大棚，早晨co2浓度超过2000毫克／千克，可以不进行co2施肥；秸秆基质可以调节营养液的生理酸碱性，经测定基质ph值稳定在7左右；同时，在分解过程中，产生的糖份、氨基酸等小分子有机物，可以被蔬菜根系吸收，改善蔬菜的品质；秸秆基质在使用后，可作为有机肥料料施入农田，不产生环境污染。

3、营养液的管理。采用营养液肥料分组分别通过滴灌系统加入到基质的方式，农民很容易掌握。这样减少了传统营养液的配制操作和营养液池设施。

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