تعیین حدود بحرانی عناصر غذایی کم مصرف در خاک مزارع گندم منطقه بویین زهرا به روش کیت- نلسون

In order to study of Determination of Critical levels of nutrients in soil of wheat with analysis by using of Cate- Nelson method in Boin zahra region carried out to measure chemical properties of soil a composed sample was choose sample was from at 0-30 cm depth. Amount and time of application of fertilizer in check block was in conformity with natural field and in treatment block was in conformity with was soil test. After steps implementation of implant in order to determine availability element by plant that sample of leaf preparing wheat. Then operation harvesting wheat grain and straw yield determined. Critical levels of in soil by using method of Cate-Nelson for Fe , Zn , Cu , Mn and B were 3.8 , 0.61, 1.3, 13 and 2/4 mg/kg soil.