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С¸ë×Ó0529(½ð±Ò+10, ·­ÒëEPI+1):¾¡¹Ü»¹²»ÊǷdz£×¨Òµ£¬µ«ÊÇÐÁ¿àÄúÀ²£¡ 2011-01-08 13:53:33
But other salt extraction agents can extract part of non-exchangeable K by extending the extraction time.On the soil of seasonal crops that is as the main source of  the non-exchangeable K ,as Superiority of an effective K even exceeds the method of ammonium acetate.The method of cation exchange resin can also extract soil non-exchangeable K,but the operation is more complicated,this method is more suitable for situ studying migration of soil potassium,diffusion and so on.The method of sodium tetraphenylborate is higher extraction efficiency.It can extract different levels of non-exchangeable K
by adjusting the extraction force,and may be used of measuring available potassium of every types of soil and crop soil.
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