Document Type : Original Article
Author
Soil water and environment research Agricultural research center,Giza,Egypt
Abstract
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 .
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