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Two field experiments were designed to quantify the effect of combined phosphate fertilizer with humic acid on maize growth, i.e., plant height and dry weight plant-1 ; yield components, namely ,number of rows ear -1 ,number of grains ear -1 and 100-grain weight; yield parameters (grain, stover and biological yields ) ;N,P and K uptake as well as soil properties and fertility after maize harvest . The experiments were conducted at Sids Agriculture Research Station, A.R.C , Beni Suef Governorate ,Egypt during two successive seasons of 2017 and 2018 .The treatments were : Phosphorus levels (0.0 ,37.0 and 74.0 kg P ha-1 ) and humic acid ( without,0.2% foliar spraying  and 24 kg ha-1humic acid ) .The results revealed that increasing phosphorus levels up to 74.0 kg P ha-1 improved soil available phosphorous after harvest ,while other soil properties and fertility did not affect . Also, it increased all studied growth parameters, yields and yield components as well as N,P and K uptake , except number of grains row-1 .Added humic acid as soil application improved soil pH ,EC ,soil organic matter and the availability of N,P and K in soil after harvest . Humic acid, whether as foliar or soil application enhanced maize growth, yields and its components and N,P and K uptake ,where added humic as soil application have more pronounced affect . The interaction between phosphorous and humic acid show that ,combined 37.0 kg P h-1 with 24 kg ha-1humic acid as soil application produced equal affect as 74.0 kg ha-1 on the studied quality and quantity of maize , which means the possibility of save about 37.0 kg ha -1 by using humic acid as soil application .

Phosphate Fertilizer –Humic Acid Interaction and Its Effect on Soil Properties and Fertility As Well As Quality and Quantity of Maize Production