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液體水溶性肥料產品如何選擇?

發布日期: 2017-03-09 作者:水溶肥設備 閱讀量:
導讀: 目前市場上的液體水溶性肥料產品主要有腐植酸、氨基酸、大量元素、中量元素、微量元素及有機水溶性肥料六種。種類雖不同,但分辨其質量好壞的方法基本一致,主要從看、稱、聞、冷凍和檢驗五個方面進行。 一是看產品物...

   目前市場上的液體水溶性肥料產品主要有腐植酸、氨基酸、大量元素、中量元素、微量元素及有機水溶性肥料六種。種類雖不同,但分辨其質量好壞的方法基本一致,主要從看、稱、聞、冷凍和檢驗五個方面進行。
    一是看產品物理狀態。好的液體肥料產品澄清透明,潔凈無雜質,而懸浮肥料氨基酸、腐植酸等黑色溶液雖然不透明,但仔細觀察,好的產品倒置后瓶底沒有沉淀,質量差的產品瓶子里可能會有很多固體不溶物出現。
    二是稱產品重量。行業標準,每種產品都有最低營養元素含量要求,液體肥料中每種營養元素以“克/升”為單位,意思是單位體積內所含營養元素質量,值越大,相同體積液體產品越重,其比重越大。因此,比重大小是衡量液體肥料產品好壞重要指標,好的產品不一定比重很大,但比重很小的產品一定是養分含量不足。合格的氨基酸、腐植酸及有機水性液體肥料比重一般在1.25以上,即1升液體肥料重量在1.25千克以上,大、中、微量元素液體肥料比重一般在1.35以上。
    三是聞產品氣味。好的產品沒有明顯氣味,有些產品在弱酸或弱堿性條件下略有氨味有濃重氨味的產品是酸堿度沒掌握好,有特殊香味的一般是為掩蓋某些大家熟悉的氣味。
    
四是通過冷凍,檢驗產品穩定性。液體肥料溶液中析出固體,一般分兩種情況,一個是久置慢慢析出,另一個是低溫、溶解度減小析出,冷凍是為檢驗產品低溫條件下穩定性,好的產品放置在冰箱里速凍24小時不會分層、結晶,而那些分層結晶的產品是沒有選擇好原料、控制好生產工藝造成的。
    五是檢測產品性質。如用pH試紙檢測其酸堿度,一般廠家生產出來的高含量液體肥料可能呈現強酸或強堿,對作物不安全,液體肥料與其他農藥混配施用很困難,技術過硬的廠家生產的產品pH接近中性或呈弱酸弱堿性。用磷酸二氫鉀或磷酸一銨溶液檢驗“糖醇鈣”是否含糖醇,含糖醇的產品,鈣離子螯合度高,遇到含磷溶液不會沉淀。

 

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