Wafaa Suleiman Khedr*(1)
(1). Crops Field Department, Faculty of Agriculture, Al Baath University, Homs, Syria.
(*Corresponding author: Dr. Wafaa Suleiman Khedr. E-Mail: ghassankdr@gmail.com).
Received: 10/03/2018 Accepted: 03/10/2018
Abstract
The research was conducted during 2017season at a field in Talkalakh region in Western Area of Homs governorate. The research objectives were to study the effect of spraying humic acids 2.5cm3/l and adding nitrogen fertilizer on growth and productivity of maize variety (Gouta82). Three treatments of humic acids were used: control, one time of spraying after 15 days of planting and two times of spraying humic acids (the first one after 15 days of planting while the second one after 30 days of planting). Four levels of nitrogen fertilizer were used i.e. 0,60,90 and 120 kgN/ha. Spilt – plot design with three replications was applied. Humic acids treatment were allocated in the main plots but nitrogen fertilizer treatments were represented in the sub plots. Results showed that increasing number of spraying humic acids to two times caused an increase in: number of leaves per plant, leaf area index, plant height, ear characters, grain yield and its components. Also, increasing nitrogen fertilizer levels caused an increase in: number of leaves per plant, leaf area index, plant height, ear characters, grain yield and its components. Spraying humic acids two times and adding 120 kgN/ha gave the highest grain yield (7229.25) kg/ha.
Key words: Zea maize, Humic acids, Nitrogen fertilizer, Grain yield.
Full paper in Arabic: PDF