Response of New Cotton Variety (Rassafa) to Nitrogen Fertilizer and Partial Rootzone Drying Drip Irrigation

Ibrahim Mubarak*, Mussaddak Janat
Department of Agriculture, Atomic Energy Commission of Syria, Damascus Syrian Arabic Republic

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© 2018 Mubarak and Janat.

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: ( This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the Department of Agriculture, Atomic Energy Commission of Syria, Damascus, Syria, P.O. Box 6091; Tel: 00963112132580; E-mail:



Due to the water shortage and dry Mediterranean condition, determination of water and nitrogen (N) fertilizer requirements is a major challenge for crop production and environment protection. A field experiment was carried out for two consecutive years (2014 and 2015) to evaluate the response of a new cotton variety (cv. Rassafa) to N-fertilizer and drip irrigation.


Treatments consisted of five different N-rates (0, 50, 100, 150, and 200 kg N ha-1), and three irrigation modes: full irrigation (FI), fixed partial rootzone drying irrigation (FPRD80), and alternate partial rootzone drying irrigation (APRD80). They received 100, 80, and 80% of the seasonal water use, respectively. Cotton was irrigated when soil moisture in the specified active root depth was 80% of the field capacity as designated by the neutron probe.


Results indicated that seed cotton yield (SCY), dry matter (DM), and water productivity (WP) could be optimized at an average N-rate of 140 kg N ha-1, for the tested cotton cultivar, whatever the irrigation mode used. In contrast to APRD80 mode, the findings showed that both FI and FPRD80 modes exhibited a consistence over years, but with an obvious preference of FI in SCY, DM, and WP.

Keywords: Partial rootzone drying irrigation, Water productivity, Clay loam soil, Dry mediterranean area, Seed cotton yield (SCY), Dry matter (DM).