تعیین تابع تولید محصول- آب مصرفی چغندرقند در قزوین

نوع مقاله: کامل علمی - پژوهشی

نویسندگان

1 دانشیار

2 عضو هئیت علمی

چکیده

این پژوهش با هدف تعیین "تابع تولید محصول- آب مصرفی" چغندرقند و ارزیابی توابع تولید تجربی در شهرستان قزوین انجام شد. پژوهش حاضر با چهار تیمار آبی شامل  E4, E3, E2, E1به ترتیب 60 ،90 ،120 و150 میلی متر تبخیر از تشت تبخیر کلاس A در ایستگاه تحقیقات کشاورزی فیض آباد به مدت سه سال اجرا گردید. از آنجا که اثر سال بر عملکرد محصول معنی دار بود، لذا جهت مقایسه مقدار ضریب واکنش عملکرد محصول بر اساس توان ماهانه، تیمار ها از T1 تا T11 نام گذاری شدند. نتایج نشان داد که نیاز آبی گیاه چغندرقند در کل دوره رشد برابر با 1028 میلی متر بود و تیمار  T1با 74680 کیلوگرم در هکتار حداکثر و تیمار  T11با 23000 کیلوگرم در هکتار حداقل عملکرد محصول را داشته اند. با توجه به مطابقت آماری، روش پیشنهادی که مقدار ضریب واکنش عملکرد محصول را بر اساس توان ماهانه برآورد می کند، کمترین مقدار ریشه مربعات خطای استاندارد (RMSE) و ریشه مربعات خطای استاندارد نرمال شده (NRMSE) و نیز بیشترین مقدار ضریب توافق (d) و ضریب تبیین (2R) را داشت. در نتیجه روش توان ماهانه ای، روش مناسب برای توصیه می باشد. با استفاده از روش توان ماهانه ای، مقدار ضریب واکنش عملکرد گیاه در ماه های اردیبهشت، خرداد، تیر، مرداد، شهریور و مهر به ترتیب برابر با 0/6، 0/6، 1/35، 1/35، 0/83 و 0/6 و برای مراحل رشد ابتدایی، توسعه گیاه، میانی و نهایی به ترتیب برابر با 0/6، 0/8، 1/35 و 0/6 و متوسط آن برای کل دوره رشد چغندر قند برابر با 89/0 بدست آمد.  در نهایت با استفاده از تابع توان ماهانه و ضرایب بدست آمده، برنامه بهینه توزیع آب در شرایط مختلف کمبود آب، ارائه شد.

کلیدواژه‌ها


عنوان مقاله [English]

Determination of yield - water use function for sugar beet in Qazvin

نویسنده [English]

  • niaz ebrahimipak 1
چکیده [English]

The purpose of this study was to determine yield-water use function of sugar beet in Qazvin city, and evaluation of empirical yield functions. The experiment was conducted at Feizabad Research Station for three years. Treatments were composed of four irrigation levels including 60 (E1), 90 (E2), 120 (E3) and 150 (E4) mm evaporation from class A pan, respectively. Since the effect of year on crop yield was significant, the treatments were labelled from T1 to T11 to compare the crop yield response coefficient based on monthly function. Results showed that the water requirement of sugar beet was equal to 1028 mm across the growth period with treatments T1 (74680 kg/ha) and T2 (23000 kg/ha) having the maximum and minimum yields, respectively. According to the statistical correspondence, the “proposed method” which estimates the amount of product response coefficient on the basis of monthly function, yielded the least root mean square of standard error (RMSE) and normalized root mean square of standard error (NRMSE) and as well as the highest agreement index (d) and correlation coefficient (R2). As a result, the monthly power function method is recommendable. Using monthly function method, the crop yield response coefficient for April, May, June, July, August and September was equal to 0.6, 0.6, 1.35, 1.35, 0.83 and 0.6, respectively and for the initial growth, development, Middle, and final growth stages was to 0.6, 0.8, 1.35 and 0.6, respectively with an average of 0.89 for the total growth period. Finally, using the monthly function and coefficients, an optimal water distribution program for various conditions of water shortage was presented.

کلیدواژه‌ها [English]

  • Evaporation pan
  • sugar beet
  • Yield response factor (Ky)
  • Water requirement
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