اثر تنش آبي بر ‌رشد،عملكرد و كارايي مصرف آب فلفل در شرايط گلخانه‌‌اي

اين پژوهش به‌منظور،بررسي تاثير تيمارهاي آبياري به ميزان 40 ،60،80و100 درصد نياز آبي بر شاخص‌ رشد،عملكرد و كارايي مصرف آب روي گياه فلفل قلمي(Capsicum annuum L.)،درگلخانه دانشگاه شهركرد،درداخل 12 گلدان دريك خاك لومي- رسي درقالب طرح كاملاً تصادفي با 4 تيمارو 3 تكراردر سال 1391 انجام گرفت.نتايج نشان داد كه ميزان آب آبياري بر شاخص‌ رشد، عملكرد وكارايي مصرف آب ((WUEدرسطح پنج درصد معني‌دار بوده است.حداكثر عملكرد محصول و حداكثر كارايي مصرف آب در تيمار 100 درصد نياز آبي به‌دست آمد. هم‌چنين مشاهده شد كه باكاهش مصرف آب به‌ميزان 20،40 و 60 درصد نياز آبي،عملكرد محصول به‌ترتيب 98/26،92/50و49/69درصد كاهش يافت. با كاهش مصرف آب به‌ميزان20،40و60درصدنيازآبي،كارايي مصرف آب به‌ترتيب 56/10،24/22و35/29درصد كاهش يافت. باتوجه به اين‌كه اختلاف عملكردبين تيمارهاي 100 درصد نياز آبي و80 درصدنيازآبي درسطح 5 درصدمعني دارنبود لذا توصيه ‌شدكه درشرايط محدوديت ‌آب آبياري مي‌توان،تاحداكثر 20 درصدنيازآبي گياه را كاهش داد.

The present research was conducted to study the effect of irrigation treatments on growth indices, yield, and water use efficiency of long green pepper (Capsicum annuum L.) at the research greenhouse of Shahrekord University. This experiment was done in a clay-loam soil using randomized design with four treatments i.e. 40%, 60%, 80%, and 100 percent of water requirement and three replications, in 12 pots, during 2012. The obtained results from statistical analysis indicated that the effect of irrigation water on growth indices, yield, and water use efficiency (WUE) was significant at 5% level. Maximum yield and maximum water use efficiency were achieved in treatment of 100 percent water requirement i.e. full irrigation. Furthermore, it was observed that water use reduction by 20%, 40% and 60 percent led to reduction in yield by 26.98%, 50.92% and 69.49 percent, respectively. Moreover, it was observed that water use reduction by 20%, 40% and 60 percent led to reduction in water use efficiency by 10.56%, 22.24% and 29.35% percent, respectively. Since there was no significant difference in yield between 100% and 80 percent treatments, it is recommended that under water shortage conditions, the maximum reduction in water application be limited to 20 percent of water requirement.