Economic analysis of the optimal level of supplemental irrigation for rain-fed figs

Document Type: Full Article

Authors

Department of Irrigation, College of Agriculture, Shiraz University, Shiraz, I. R. Iran

Abstract

ABSTRACT- The aim of this study is economic analysis of supplemental irrigation (SI) for rain-fed fig trees in the south of Iran, with and without micro-catchment water harvesting systems (MCWHS). Under no MCWHS, by decreasing about 55 % of applied water, the fig yield decreased about 28% and net income increased twice compared with the maximum yield condition. In general, the optimal amount of SI water would be lowered by using MCWHS in comparison with no using MCWHS. By using MCWHS, decreasing about 50 % of applied water causes about 14 % decrease in fig yield and net income increased twice compared with maximum yield condition. In order to obtain high net profit with a given amount of annual rainfall, the amount of optimal SI water decreased by increasing the unit price of water. An equation is proposed for the prediction of annual precipitation which may be used for planning SI for the fig trees in the study region. 

Keywords


Article Title [Persian]

تحلیل اقتصادی مقدار بهینه آبیاری تکمیلی انجیر دیم

Authors [Persian]

  • مریم خزاعی
  • علیرضا سپاسخواه
گروه مهندسی آب، دانشکده کشاورزی، دانشگاه شیراز، شیراز، ج. ا. ایران.
Abstract [Persian]

هدف از این مطالعه تحلیل اقتصادی آبیاری تکمیلی انجیر دیم در جنوب ایران با استفاده و بدون استفاده از آبگیر می باشد. با کاهش حدود 55 درصد در آب کاربردی عملکرد انجیر 28 درصد کاهش یافت و سود خالص در مقایسه با حداکثر محصول دو برابر افزایش یافت. به طور معمول میزان بهینه آبیاری تکمیلی با به کار بردن آبگیر در مقایسه با شرایط بدون آبگیر کمتر است. بدون به کارگیری آبگیر سود خالص در شرایط کمبود آبیاری تکمیلی بیشتر از شرایط آبیاری تکمیلی کامل می باشد. بعلاوه با کاهش حدود 50 درصد در آب کاربردی عملکرد محصول حدود 14 درصد کاهش و سود اقتصادی دو برابر نسبت به حداکثر عملکرد افزایش یافت.برای دستیابی به حداکثر سود اقتصادی با درنظر گرفتن بارندگی سالانه،مقدار بهینه آبیاری تکمیلی با افزایش قیمت آب کاهش یافت. معادله ای جهت پیشبینی بارندگی سالانه ارایه گردید که می تواند جهت برنامه ریزی آبیاری تکمیلی درختان انجیر استفاده گردد.

Keywords [Persian]

  • واژه های کلیدی:
  • تحلیل اقتصادی
  • آبگیر
  • جمع آوری آب
  • زراعت دیم
  • محدودیت زمین
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