تعیین تابع برتر آب – شوری – عوامل کیفی عملکرد ارقام پنبه ورامین و خرداد

نویسندگان

1 استادیار گروه علوم و مهندسی آب، دانشکده کشاورزی، دانشگاه بیرجند

2 دانشیار گروه علوم و مهندسی آب، دانشکده کشاورزی، دانشگاه بیرجند

چکیده

برای تعیین تابع برتر  آب - شوری– عوامل کیفی عملکرد (طول الیاف، یکنواختی الیاف، کشش الیاف، استحکام الیاف، ظرافت الیاف، درصد پروتئین و درصد روغن پنبه دانه) دو رقم پنبه ورامین و خرداد، مطالعه­ی بررسی تاثیر شوری و مقادیر آب آبیاری بر عملکرد و اجزای کمی و کیفی عملکرد در شرایط اقلیمی بیرجند صورت گرفت. برای این کار توابع به شکل­های خطی ساده، کاب داگلاس، درجه دوم و متعالی  مورد استفاده قرار گرفتند. در ابتدا نتایج جداول ضرایب توابع و آماره F نشان دادند که کلیه توابع مندرج در فوق توانسته‌اند برآورد تعیین کننده و معنا‌داری از عوامل طول و یکنواختی الیاف، داشته باشند. سپس بررسی ضرایب تبیین معادلات رگرسیونی رسم شده و آماره t استیودنت بین مقادیر اندازه‌گیری‌شده و پیش‌بینی شده این موارد را تائید کرد. بنابراین در مرحله بعد نسبت به رتبه‌بندی و تعیین تابع برتر در بین آنها اقدام گردید. به این منظور از پنج شاخص آماری ریشه میانگین مربعات خطا، ضریب تبیین،  بازده مدل، خطای بیشینه و ضریب مقدار باقیمانده استفاده شد. نتایج نشان داد که هیچ­ یک از توابع مورد مطالعه نتوانستند برآورد قابل قبولی از عوامل کشش الیاف، استحکام الیاف، ظرافت الیاف، درصد پروتئین و درصد روغن پنبه دانه داشته باشند و به همین دلیل از رتبه‌بندی آن صرف‌نظر شده است. نتایج بدست آمده در مورد هر دو رقم پنبه ورامین و خرداد نشان دادند که برای عوامل طول و یکنواختی الیاف، تابع درجه دوم می­تواند به عنوان تابع برتر در منطقه اقلیمی بیرجند معرفی شود.

کلیدواژه‌ها

عنوان مقاله [English]

Determination of Water-Salt optimal production functions for yield qulitative components of Varamin and Khordad cultivars

نویسندگان [English]

  • M H najafi mood 1
  • A khashei siuki 2
  • A shahidi 2
1 Assist. Prof., Dept. of Water Engin., Faculty of Agric., University. of Birjand, Birjand, Iran
2 Assoc. Prof., Dept. of Water Engin., Faculty of Agric., University of Birjand, Birjand, Iran
چکیده [English]

In order to determine the best water - salt - the quality parameters (fiber length uniformity, fiber, fiber tension, fiber strength, fineness of fiber, protein and oil content of seed cotton) in Varamin and Khordad Cultivars of Cotton research project examines the impact of salinity and water levels irrigation on yield and yield components and quality of two varieties of cotton were conducted in Birjand climate. It forms a simple linear function, Cobb-Douglas, quadratic and transcendental were used. First results tables and statistics functions F coefficients showed that all functions mentioned above and were able to estimate the parameters of the fiber length and uniformity, have. The coefficients of the regression lines are plotted equations and graphs contained in the Student t-statistic regression line between the measured and predicted values ​​confirmed this. So the next step was to rank and identify the best among them. The purpose of the five statistical parameters Root Mean Square Error (RMSE), Coefficient of Determination (CD), modeling efficiency (EF), the maximum error (ME) and coefficient of residual (CRM) was used. The results showed that the parameters of both cultivars Khordad and Varamin cotton fiber length and uniformity, can function as a quadratic function is superior to the other functions in the present climate of Birjand. The results  showed that none of the functions could not reasonably estimate the parameters of the fiber tension, fiber strength, fiber fineness, cotton seed protein and oil content have been ignored and that's why the ratings. Resulte showed that both cultivars of Varamin and Khordad parameters for fiber length uniformity, quadratic function can be expressed as function of the regional climate Birjand superior to other functions will be presented.

کلیدواژه‌ها [English]

  • Cotton
  • Deficit Irrigation
  • Irrigation water salinity
  • Production function

مراجع

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دانش آب و خاک
دوره 27، شماره 4
دی 1396
صفحه 49-61

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