تاثیر سطوح مختلف کودهای نیتروژنی و پتاسیمی بر جبران خسارت ساقه‌خوار نواری برنج، Chilo suppressalis (Lep.: Crambidae) در مزرعه

نوع مقاله : مقاله پژوهشی

نویسندگان

موسسه تحقیقات برنج کشور، سازمان تحقیقات، آموزش و ترویج کشاورزی، رشت، ایران

چکیده

استفاده از کود پتاسیمی به همراه کود نیترونی می­تواند در بازیابی آسیب­های گیاه برنج در هنگام حمله کرم ساقه­خوار مفید باشد که در نهایت منجر به کاهش مصرف حشره­کش­های شیمیایی در شالیزار می­شود. این پژوهش در مرحله رویشی گیاه و نسل اول آفت روی برنج رقم هاشمی انجام شد. برای انجام آزمایش از تیمارهایی به شرح زیر استفاده شد: T0= بدون استفاده از کود نیتروژنی و پتاسیمی (شاهد)،T1 =مصرف 100 کیلوگرم کود اوره+100 کیلوگرم کود سولفات پتاسیم،T2 =مصرف 130 کیلوگرم کود اوره+150 کیلوگرم کود سولفات پتاسیم،T3 =مصرف 163 کیلوگرم کود اوره+200 کیلوگرم کود سولفات پتاسیم،T4 =مصرف 195 کیلوگرم کود اوره+250 کیلوگرم کود سولفات پتاسیم. نتایج نشان داد که مناسب­­ترین مقدار کودی ترکیب کودهای نیتروژنی و پتاسیمی به ترتیب 130 و 150 کیلوگرم در هکتار به صورت تقسیط در دو مرحله می­تواند خسارت کرم ساقه­خوار نواری برنج را در نسل اول و در مرحله رویشی گیاه برنج جبران نموده و حتی منجر به افزایش عملکرد آن نسبت به تیمار شاهد شود. همچنین، رابطه رگرسیونی بین جوانه­های مرکزی مرده و میزان عملکرد محصول برنج ناشی از تیمارهای کودی طی دو سال پژوهش نشان داد که با کاهش درصد آلودگی جوانه­های مرکزی در نسل اول، میزان عملکرد محصول در تیمارهای مورد آزمایش روند افزایشی داشت. بنابراین، موفقیت در مدیریت ساقه­خوار نیازمند توسعه روش­های بهینه برای جبران خسارت و افزایش تولید برنج می­باشد.

کلیدواژه‌ها


عنوان مقاله [English]

The effect of different levels of nitrogen and potassium fertilizers on the compensation of the rice stem borer, Chilo suppressalis (Lep.: Crambidae) in the field

نویسندگان [English]

  • F. Majidi-Shilsar
  • H. Shokrivahed
Rice Research Institute of Iran, Agricultural Research Education and Extension Organization (AREEO), Rasht, Iran
چکیده [English]

The use of potassium fertilizer along with nitrogen fertilizer can be useful in recovering the damages of the rice plant during the attack of the stem borer, which ultimately leads to the reduction of the use of chemical insecticides in the paddy field. This research was carried out in the vegetative phase of the plant and the first generation of the pest on Hashemi cultivar rice. The following treatments were used for the experiment: T0=without the use of nitrogen and potassium fertilizer (control), T1=consumption of 46 kg of pure nitrogen per hectare with 50 kg of pure potassium oxide per hectare (100 kg of urea fertilizer+100 kg of fertilizer Potassium sulfate), T2=Consumption of 60 kg of pure nitrogen per hectare with 75 kg of pure potassium oxide per hectare (130 kg of urea fertilizer+150 kg of potassium sulfate fertilizer), T3=Consumption of 75 kg of nitrogen per 100 kg of nitrogen per hectare pure per hectare (163 kg of urea fertilizer+200 kg of potassium sulfate fertilizer) and T4=consumption of 90 kg of pure nitrogen per hectare with 125 kg of pure potassium oxide per hectare (195 kg of urea fertilizer+25 kg of sulfate fertilizer). The results showed that the most appropriate amount of fertilizer to compensate for the damage caused by the rice stem borer is the combination of nitrogen and potassium fertilizers, respectively 130 and 150 kg per hectare in two stages in the form of division and during the growth stage of the rice plant and in addition to compensation, it leads to an increase in its yield compared to the control treatment. Also, the regression relationship between dead hearts and rice crop yield due to fertilizer treatments during two years of research showed that with decreasing the percentage of dead hearts contamination in the first generation, crop yield in the treated treatments had an increasing trend. Therefore, success in stem borer management requires the development of optimal methods to compensate the damage and increase rice production.

کلیدواژه‌ها [English]

  • Agronomic control
  • chemical fertilizer
  • compensation
  • dead hearts
  • rice
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