Evaluation of nitrogen fertilizer management effects on yield in flowering stage of rapeseed in Gorgan region

Behdadian, Alireza; Soltani, Afshin; Zeinali, Ebrahim; Ajam Norouzi, Hossein; Masoumi, Hassan

doi:10.22059/jci.2013.35731

Evaluation of nitrogen fertilizer management effects on yield in flowering stage of rapeseed in Gorgan region

Document Type : Research Paper

Authors

Alireza Behdadian ¹

Afshin Soltani ²

Ebrahim Zeinali ³

Hossein Ajam Norouzi ⁴

Hassan Masoumi ¹

¹ Department of Agriculture - Consulting Engineers of Jame Iran

² Professor - Agricultural and Natural Resources University of Gorgan

³ Assistant - Agriculture and Natural Resources University of Gorgan

⁴ President Azad University of Gorgan

10.22059/jci.2013.35731

Abstract

To evaluate the effects of nitrogen management at yellow budding stage on seed yield with using nitrogen nutrition index (ratio of nitrogen concentration in the plant to optimum concentration), of rapeseed farms in Gorgan, an experiment was conducted as a nested model arranged in a complete randomized design (CRD) in 2010. Fifteen rapeseed fields were classified at three levels of management (optimum, middle, weak). During the experiment, questionnaires were completed by farmers for quantification of agricultural management. The results showed that levels of management are significantly difference from nitrogen nutrition index (NNI) (P<0.01). Although quantities of nitrogen nutrition index (NNI) were higher in optimum level of management than the middle and weak levels, but at all management levels during the growing season, the index was less than one. This indicates restriction in development and production due to nitrogen deficiency. Nitrogen nutrition index in yellow budding stage have, significant positive correlation (P<0.05) with seed yield, and confirmed importance of access to nitrogen sources in yellow budding stage.

Keywords

Critical Nitrogen

Fertilizer Management

Nitrogen Nutrition Index

rapeseed

Seed yield