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滴灌,選對合適的過濾器很重要

文字:[大][中][小] 手機頁面二維碼 2017/9/18     瀏覽次數:    

  滴灌的關鍵是防堵塞。選擇合適的過濾器是滴灌成功的先決條件。常用的過濾器有砂石分離器、介質過濾器、網式過濾器和疊片過濾器。前兩者做初級過濾用,后兩者做二級過濾用。過濾器有很多的規格,選擇什么過濾器及其組合主要由水質決定。這是較專業的問題,最好由專業人士設計和選擇。



  微滴灌系統通過灌水器(微噴頭或滴頭)來調節流量,灌水器的流道直徑很小,極易被灌溉水中的物理和化學雜質堵塞,因此,為防止灌水器堵塞和投資浪費,在微滴灌系統中必須配備合適的過濾器。在選擇過濾器之前,應首先確定一下因素:


  1、弄清楚灌溉水中有那些雜質。通過水質化驗可獲得雜質的粒徑、物理特性、濃度等指標,這些指標將決定所選過濾器型及其維護方式。


  2、確定所選灌水器的流道直徑,將用此直徑選定過濾器的過濾能力。


  3、確定灌溉系統的峰值流量,將用此流量選擇過濾器的過濾容量。


  4、進行造價比較。若選定了一種過濾器,但必須把自動控制和維護管理費用加進總造價中,進行經濟比較后選擇合適的過濾系統。


  5、過濾器的目數即過濾器的過濾能力取決于灌水器的流道直徑,網式和疊片過濾器的過濾能力通常以目數表示,而砂石過濾器的過濾能力則用過濾砂的標號表示。


  滴灌施肥只灌溉根系和給根系施肥。因此一定要了解所管理的作物根系分布的深度。最簡單的辦法就是用小鏟挖開根層查看濕潤的深度,從而可以判斷是否存在過量灌溉。或者地里埋設張力計監控灌溉的深度。

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