Rabab Moner Nasser*(1) Leila Ahmed Habib(1) and Ghiath Ahmed Alloush(1)
(1). Department of Soil and Water Sciences, Faculty of Agriculture, Tishreen University, Latakia, Syria.
(*Corresponding author: Eng. Rabab Moner Nasser. Email: rababnasser1973@gmail.com).
Received: 08/04/2018 Accepted: 02/07/2018
Abstract
A field trial was conducted in 2014 at Al Henadi village, which located in south of Latakia, to evaluate the response of three plant species: Rape plant, chickpea and Bermuda grass to phosphate rock (PR) compared to triple super phosphate (TSP). Phosphate sources (PR and TSP) were applied at three rates (520, 1040, 1560 kg P/ha) besides the control without addition. Also, an agar experiment was conducted to illustrate the role of root exudates in rhizosphere pH changes. The results showed that rape plant had high response to PR application, with high relative agronomic effectiveness (RAE%) of 102% compared to TSP. Whereas chickpea came second with a RAE value of 77.5% compared to TSP. Finally, Bermuda showed a RAE% varied between 2 and 75% according to the number of cut, and 44% for total yield. The main factor may influence plant response to PR was due to induced changes in pH by roots system, and the exuded organic acids as showed by agar technique in chickpea and rape.
Key words: Rape plant, Chickpea, Bermuda grass, Phosphate rock, Agar technique.
Full Paper in Arabic: PDF