Samia Alshbib(1)*, Abd alghani Khorshid(2), Ahmad Aljomaa(1)and Abd alghani Khaldi(1).
(1). Cotton Research department, General Commission of Scientific Agricultural Research, Aleppo, Syria.
(2). University of Aleppo, Aleppo, Syria.
(*Corresponding author: Eng. Samia Alshbib. E-Mail samshbib3@gmail.com)
Received: 24/03/2021 Accepted: 24/08/2021
Abstract
Cotton is one of the most important fiber crops in the world, the availability of essential nutrients is one of the main factors on which the growth and the yield of the crop depends. In order to quantify the crop, need out of these elements, a full evaluation of crop nutrient requirements is required. Field experiments were conducted in 2020 in two sites, the first is the agricultural scientific research center in Hama, the second is the Jeb Ramla research station of Al-Ghab scientific agricultural research center. To assess for the requirements of cotton crop (variety Aleppo 124) to main elements NPK applied in seven different levels in addition to the control, the experiments were arranged in randomized block design with three replications. Result showed that increasing the application of fertilizers by 15% higher than the recommended fertilizer recommendation led to a significant increase in crop yield in Hama site, where it reached the highest productivity 4988 kg.h-1, the results also showed that the increase in the amount of applied fertilizer over the fertilizer recommendation was not significant in the second site. It was also found that the increase in fertilizer levels led to a significant increase in plant height, as it reached 91 cm in Hama and 98.89 cm in Al-Ghab and the number of monopodia and sympodial branches reached the highest number of 9.44 in Hama and 12.17 in Al-Ghab, likewise, the chlorophyll content of leaves increased, as well as the leaf area index with some differences between the two sites, this indicates that the yield was positively affected with an increase in the available essential nutrients to a certain extent, then, the increase in the amount of fertilizer turns into a decrease in the yield of the crop.
Key words: Nitrogen, phosphor, potassium, cotton, chlorophyll number, leaf area index.
Full paper in Arabic: pdf