نوع مقاله : علمی - پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشدآگروتکنولوژی، گروه آگروتکنولوژی، دانشکده کشاورزی، دانشگاه فردوسی مشهد، مشهد، ایران

2 دانشیار، گروه آگروتکنولوژی، دانشکده کشاورزی، دانشگاه فردوسی مشهد، مشهد، ایران

3 استادیار مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی خراسان رضوی، مشهد، ایران

چکیده

د
چکیده
در کشت تأخیری چغندرقند (Beta vulgaris L.)، استفاده از کود نیتروژن و باکتری محرک رشد، می‌تواند در تسریع رشد و جبران زمان از دست‌رفته، اهمیت زیادی داشته باشد. برای بررسی این موضوع آزمایشی به‌صورت کرت‌های دو بار خردشده در قالب طرح بلوک‌های کامل تصادفی در ۳ تکرار با 6 تیمار در سال ۱۳۹۷ بر روی رقم آرتا و در مزرعه پژوهشی دانشکده کشاورزی دانشگاه فردوسی مشهد انجام شد. عامل‌های مورد مطالعه شامل تاریخ کشت (کشت‌های معمول و تأخیری) به‌عنوان عامل اصلی، کود نیتروژن از منبع اوره با دو سطح (کود نیتروژن بر اساس توصیه و ۲۵ درصد کمتر از توصیه) به‌عنوان عامل فرعی و باکتری محرک رشد با دو سطح (مایه‌زنی با باکتری و بدون باکتری) به‌عنوان عامل فرعی فرعی در نظر گرفته شدند. نتایج نشان داد اثر تیمار مایه‌زنی با باکتری محرک رشد روی ویژگیهایی نظیر سطح برگ، ماده خشک، عملکرد ریشه و میزان عیار قند بهترتیب 13، 20، 9 و 8 درصد تأثیر افزایشی داشت. هم‌چنین تیمار باکتری محرک رشد روی میزان سدیم، پتاسیم و نیتروژن مضره  ریشه کمترین تأثیر را در هر دو تاریخ کشت معمول و تأخیری از خود نشان داد. به نظر می‌رسد در شرایط آزمایش حاضر، در کشت تأخیری برای جبران زمان از دست‌ رفته در گیاه چغندرقند، استفاده تلفیقی از کودهای شیمیایی و زیستی مؤثر است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Effect of N Fertilizer and Growth Stimulating Bacteria on Growth of Sugar Beet in Delayed Sowing

نویسندگان [English]

  • Nasrullah Nusrat 1
  • Morteza Goldani 2
  • Javad Rezai 3

1 M.Sc. Student Agrotechnology, Department of Agrotechnology Ferdowsi University of Mashhad, Mashhad, Iran

2 Associate Professor, Department of Agrotechnology Ferdowsi University of Mashhad, Mashhad, Iran

3 Assistant Professor, Khorasan Razavi Agricultural and Natural Resources Research and Education Center of Mashhad, Mashhad, Iran

چکیده [English]

 
Abstract
Introduction
Concurrency of cereals late-season irrigation with early irrigation of sugar beet season and lack of water resources at this time, has made some farmers to delay sugar beet cultivation. The planting date plays a key role in growth, quality and yield of sugar beet. Delayed cultivation leads to reduced sugar beet yield. In late cultivation of sugar beet (Beta vulgaris L.), the use of nitrogen fertilizer and growth promoting bacteria can be of great importance in accelerating growth and compensating for lost time. The aim of this study was to find a sustainable way to increase the growth rate of sugar beet in delayed cultivation, so as to compensate for the delayed growth season as possible.
 
Materials and Methods
This experiment was conducted as a split split plot in a randomized complete block design with 6 replications on Arta sugar beet cultivar at the Research Farm of Ferdowsi University of Mashhad in 2018. The factors included planting date (regular and delayed sowing) as main factor, nitrogen fertilizer (based on recommendation and 25% less than recommended) as sub-factor and Nitrobacter application and non-Nitrobacter were considered as sub-factors.
 
Results and Discussion
The results showed that the inoculation effect of Nitrobacter on leaf area, total dry matter, root yield and sugar content increased by 13, 20, 9 and 8 percent, respectively. Also, Nitrobacter treatment had the least effect on the amount of sodium, potassium and nitrogen of root in both sowing dates. For delayed planting date, using nitrogen fertilizer plus growth promoting bacteria can offset the delay in planting date. Therefore, this recommendation can reduce water consumption by reducing sugar beet growing season and reduce fertilizer use. It seems that the combination of chemical and biological fertilizers is effective on sugar beet delayed cultivation in order to compensate for lost time.
 
Conclusion
The combination of chemical and biological fertilizers is effective on sugar beet delayed cultivation in order to compensate for lost time.
 

کلیدواژه‌ها [English]

  • Amino nitrogen
  • Nitrobacter
  • Planting date
  • Root yield
  • Sugar content  
 
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