نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه علوم خاک دانشکده کشاورزی دانشگاه ارومیه، نازلو ارومیه ایران

2 دانشیار گروه علوم خاک دانشکده کشاورزی دانشگاه ارومیه ایران

3 استادیار گروه علوم خاک بخش تحقیقات اب و خاک، تبریز ایران

چکیده

روش انحراف از درصد بهینه (DOP) از روش­های تفسیر نتایج تجزیه برگ و تشخیص وضعیت تغذیه­ای گیاهان می­باشد. به­منظور ارزیابی وضعیت تغذیه­ای کدو (Lagenaria Vulgaris) با استفاده از روش DOP، نمونه­های برگ از 122 مزرعه کدو در شهرستان خوی جمع­آوری و غلظت­های عناصر غذاییB ،Cu ،Zn ،Mn ،Fe ،Mg ،Ca ،K ،P  ،N تعیین شدند. مزارع با توجه به عملکرد به دو گروه با عملکرد بالا و پایین تقسیم گردیدند. میانگین غلظت عناصر غذایی در مزارع کدو با عملکرد بالا به عنوان ارقام مرجع برای محاسبه شاخص­های DOP استفاده شد. در این روش اولویت­بندی عناصر غذایی پرمصرف و کم­مصرف در مزارع با عملکرد پایین به­صورت K>P>Mg>Ca>N  و Zn>Fe>B>Cu>Mn به­دست آمد بر این اساس عنصر نیتروژن مثبت­ترین شاخص­­ و عناصر پتاسیم و روی منفی­ترین شاخص­ها را داشتند. شاخص­های­ تعادل تغذیه­ای DOP نیز در مزارع با عملکرد پایین خیلی بزرگتر از صفر به­دست آمد که نشان­دهنده عدم تعادل عناصر غذایی در این مزارع می­باشد. لذا در نهایت می­توان گفت کمبود عناصر پتاسیم و روی می­تواند دلیلی بر عملکرد پایین کدو در منطقه خوی باشد و مدیریت کودی صحیح از جمله مصرف کودهای حاوی این عناصر می­تواند رشد و عملکرد کدو را در این منطقه بهبود ببخشد.

کلیدواژه‌ها

عنوان مقاله [English]

Evaluation of Nutritional Status of Squash by Deviation from Optimum Percentage (DOP) Method in Khoy Region

نویسندگان [English]

  • Mahrokh Sharifmand 1
  • Ebrahim Sepehr 2
  • Ahmad bybordi 3

1 Iran

2 Associate prof. soil chemistry and fertility (phd). Faculty of Agriculture. Urmia University. Urmia. Iran

3 Assistant prof of plant nutrition and fertility (phd) soil and water research department. Tabriz. Iran

چکیده [English]

Abstract
 Deviation from the optimum percentage (DOP) is an important method for interpretation of the results of chemical analysis and diagnosis of nutritional status of plants. In order to evaluate the nutritional status of squash (Lagenaria Vulgaris) through DOP, 122 leaf samples were collected from squash fields of Khoy region and N, P, K, Ca, Mg, Fe, Mn, Zn, Cu and B were analyzed. The squash fields were divided into high and low yielding groups. The mean of nutrients concentration in high yielding-fields was selected as norms for the calculation of DOP indices. DOP indices showed that macro- and micro nutrients requirement as follow K>P>Mg>Ca>N and Zn>Fe>B>Cu>Mn respectively. So nitrogen had the most positive index but potassium and zinc had the most negative indices among nutrients. DOP nutritional balance index was much more than zero indicating nutritional imbalance in this region. Finally, it was concluded that K and Zn deficiencies are more critical in reduction of the squash yield and the application of their fertilizers can improve growth and yield of squash in the region.

کلیدواژه‌ها [English]

  • Norm
  • Nutrients concentration
  • Nutritional balance index
  • yield
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