Growth and yield responses of two forage sorghum cultivars to different nitrogen fertilizer rates

Document Type: Research Paper


Department of Crop Production and Plant Breeding, College of Agriculture, Shiraz University, Shiraz, I.R. Iran.


In order to evaluate the impact of different amounts of nitrogen fertilizer on growth and yield of two forage sorghum cultivars, a 2-year field experiment was carried out at the College of Agriculture, Shiraz University, Shiraz, Iran during 2010 and 2011 growing seasons. Two factorial experiments were carried out in randomized block design with three replicates, in which the treatments included nitrogen fertilizer at three levels: 69 (N1), 138 (N2) and 205 (N3) kg N ha-1 and two sorghum cultivars: Pegah and KFS2. The results showed that nitrogen fertilizer enhanced plant height, leaf area index, fresh weight, total dry weight and biological yield significantly so that these traits were higher in N3 as 5.71, 22.8, 8.13, 22.5, and 8.7% than N1, respectively. Furthermore, increasing nitrogen rate had additive effect on crop growth rate, relative growth rate, biomass duration and leaf area duration. Comparing the cultivars, it was found that, plant height, fresh weight, total dry weight and biological yield were higher in Pegah than KFS2 cultivar. Results also showed that most of the studied traits were superior for Pegah under N3 treatment; so, Pegah cultivar and application of 205 kg N ha-1 might be offered for similar agro-climatic conditions.


Main Subjects

Article Title [Persian]

واکنش رشد و عملکرد دو رقم سورگوم علوفه‌ای به مقادیر مختلف کود نیتروژن

Authors [Persian]

  • نغمه مقیمی
  • کبری مقصودی
دانشگاه شیراز
Abstract [Persian]

به منظور ارزیابی تأثیر مقادیر مختلف کود نیتروژن بر رشد و عملکرد دو رقم سورگوم علوفه‌ای ازمایشی مزرعه‌ای در دانشکده کشاورزی دانشگاه شیراز در دو سال زراعی 90-1389 انجام شد. دو ازمایش فاکتوریل در قالب طرح بلوک‌های کامل تصادفی با سه تکرار انجام شد که در آن تیمارها شامل سه سطح کود نیتروژن (69، 138 و 205 کیلوگرم نیتروژن در هکتار) و دو رقم سورگوم (پگاه و KFS2) بودند. نتایج نشان داد که کود نیتروژن به طور معنی‌داری ارتفاع بوته، شاخص سطح برگ، وزن تر، وزن خشک کل و عملکرد بیولوژیک را افزایش داد، به نحوی‌که این صفات در تیمار 205 کیلوگرم نیتروژن در هکتار به ترتیب 71/5، 8/22، 13/8، 5/22 و 7/8 درصد نسبت به تیمار 69 کیلوگرم نیتروژن در هکتار افزایش داشت. علاوه بر این، افزایش میزان نیتروژن اثر افزایشی بر سرعت رشد گیاه، سرعت رشد نسبی، دوام زی‌توده و دوام سطح برگ داشت. در مقایسه ارقام مشاهده شد که ارتفاع بوته، وزن تر، وزن خشک کل و عملکرد بیولوژیک در رقم پگاه بیشتر از KFS2بود. نتایج نشان داد که رقم پگاه در بیشتر صفات مطالعه شده و در تیمار 205 کیلوگرم نیتروژن در هکتار برتری داشت. بنابراین، رقم پگاه و کاربرد تیمار 205 کیلوگرم نیتروژن در هکتار می‌تواند برای شرایط زراعی و آب و هوایی مشابه پیشنهاد گردد.

Keywords [Persian]

  • دوام زی توده
  • سرعت رشد محصول
  • دوام سطح برگ
  • سرعت رشد نسبی
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