اثر تنش کم آبی بر کیفیت و کمیت علوفه دو رقم سورگوم علوفه ای در منطقه جیرفت

نوع مقاله: پژوهشی

نویسندگان

گروه زراعت و اصلاح نباتات، واحد میانه، دانشگاه آزاد اسلامی، میانه، ایران

چکیده

به منظور تعیین اثر سطوح تنش خشکی بر عملکرد کمی و کیفی دو رقم سورگوم علوفه­ای در منطقه جیرفت، آزمایشی به صورت کرت­های خردشده در قالب طرح پایه بلوک­های کامل تصادفی با سه تکرار در سال 1393 انجام شد. سطوح آبیاری به عنوان فاکتور اصلی با تأمین 100، 66 و 33% نیاز آبی گیاه و ارقام اسپیدفید و پگاه به عنوان فاکتور فرعی در نظر گرفته شدند. تنش آبیاری اثر معنی­داری بر تمام صفات مورد مطالعه از جمله وزن تر و خشک علوفه در هر دو رقم داشت. همچنین، تنش خشکی موجب کاهش عملکرد علوفه تر کل در سورگوم علوفه­ای گردید. در شرایط تنش شدید 47 و متوسط 17% افت عملکرد نسبت به شرایط آبیاری معمول ایجاد شد. رقم پگاه در هر دو شرایط تنش و بدون تنش آبی عملکرد بیشتری در مقایسه با رقم اسپیدفید داشت. درصد پروتئین خام، درصد الیاف خام و درصد خاکستر با کاهش اثر تنش خشکی و بهبود شرایط تأمین آب افزایش یافت. همچنین این ویژگی­های کیفی در رقم پگاه بیش از رقم اسپیدفید بود. در شرایطی که منابع آبی به عنوان عامل محدود کننده در کشت و کار سورگوم علوفه­ای باشد، می­توان با استفاده از ارقام مقاوم به خشکی و نیز کاهش دوره­های آبیاری، به ویژه در دوره­های حساس رشد گیاه، محصول علوفه مناسبی برداشت کرد.

کلیدواژه‌ها


عنوان مقاله [English]

Effect of drought stress on quantitative and qualitative traits of two forage sorghum cultivars in Jiroft region

نویسندگان [English]

  • Mehrdad Abdi
  • Mahmoud Habibi
Agronomy and Plant Breeding, Miyaneh Branch, Islamic Azad University, Miyaneh, Iran
چکیده [English]

 To evaluation the effect of different drought stress levels on yield and yield components of two forge sorghum cultivars vic. Speedfeed and Pegah, an experiment was conduct in Agricultural and Natural Recourses Research Center of Jirof in 2014. Experimental design was split plot based on randomized complete block in three replications. The main plots were three irrigation levels including 33, 66 and 100% of plant water requirement and sub plots were forage sorghum cultivars. Drought stress affected significantly on all studied traits such as fresh and dry forage yield in both cultivars. Also, drought stress caused decrement in total fresh yield in forage sorghum. In intensive and moderate drought stress fresh forage yield decreased up to 47 and 17% comparing to normal irrigation, respectively. Pegah cultivar in both stressed and none-stressed conditions had higher yield than Speedfeed. Raw protein, fiber and ash percentage increased by improvement in drought stress condition. Also, these qualitative traits in Pegah were better than Speedfeed. In deficit water condition in forage sorghum cultivation, it is possible to use drought resistant cultivars and decreasing of irrigation intervals especially in sensitive plant stages and harvest higher amounts of forage yield

کلیدواژه‌ها [English]

  •  grass sorghum
  •  Pegah
  •  Speedfeed
  •  water stress
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