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The Study of Sesame Phenology and Growth Period under Different Nitrogen Rates

Author(s): Parvaneh Sayyad-Amin

Journal: Scholars' Research Journal
ISSN 0976-8459

Volume: 1;
Issue: 1;
Start page: 01;
Date: 2010;
Original page

Keywords: sesame | phenology | nitrogen

Nutrient elements play an essential role in biological and physiological functions of plants. Nitrogen is the most important factor and is required more than other nutrients. However, little is known about sesame responses to the nitrogen. In this case, an experiment was laid out in split plots based on randomized complete block design with three replications at the Lavark Research Farm, Isfahan University of Technology, during May to October 2006. Three nitrogen rates (50, 100 and 150 Kg N ha-1) and seven sesame genotypes including Nonbranching Naz and Branching Naz (early-maturing); Yekta and Oltan (moderate-maturing) and Local Ardestan, Darab 14 and Varamin 2822 (late-maturing) were used in main and sub plots, respectively. Six important phenological phases of sesame including emergence, seedling, early flowering, early seed filling, full flowering and early physiological maturity were studied. Except for the emergence phase, increasing nitrogen rate significantly delayed all phenological phases of sesame and increased the growth period of the plant. However, early-maturing genotypes proved early and late-maturing genotypes proved late. It seems that a delay in the leaf senescence and also the enhancement in chlorophyll content, photosynthetic enzyme content and dry matter production resulted in delaying phenological phases and increasing growth period.

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