تاثیر مقدار آب و کود پتاسیم بر عملکرد و کیفیت سیب زمینی (Solanum tuberosum L) در شرایط آبیاری زیر سطحی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه فردوسی مشهد

2 فردوسی مشهد

چکیده

به منظور مطالعه تاثیر مقدار آب و کود پتاسیم بر عملکرد و کیفیت سیب زمینی در شرایط آبیاری زیر سطحی، آزمایشی به صورت اسپلیت فاکتوریل در قالب طرح بلوک های کامل تصادفی در سال 1393در مزرعه تحقیقاتی دانشکده کشاورزی دانشگاه فردوسی مشهد به اجرا در آمد. در این آزمایش کرت اصلی شامل تیمار آبیاری در سه سطح آبیاری تامین 100 درصد (شاهد)، 80 درصد و 60 درصد نیاز آبی سیب زمینی در کل دوره رشد گیاه بود و کرت فرعی شامل دو عامل سیستم آبیاری قطره ای زیر سطحی در دو سطح شامل نوار تیپ در عمق 5/7 و 15 سانتی مترعمق خاک و عامل تیمار کود شیمیایی پتاسیم در دو سطح 100 و 120 درصد توصیه آزمایش خاک در نظر گرفته شد. نتایج آزمایش نشان داد که میزان آبیاری بر اکثر صفات مورد بررسی اثر معنی داری داشت. به طوری که بیشترین میزان تعداد غده در بوته، محتوای نسبی آب برگ در تیمار شاهد یعنی تامین 100 درصد نیاز آبی سیب زمینی حاصل شد. ولی درصد ماده خشک، نشت الکترولیت و کلروفیل با کاهش آبیاری، افزایش یافت. بین دوسیستم آبیاری قطره ای از نظرعملکرد غده اختلاف معنی داری وجود داشت و میزان این صفت در تیمار نوار تیپ در عمق 5/7 سانتی متر بیشتر بود. نتایج حاصل از این آزمایش نشان داد که بین دو سطح کود شیمیایی پتاسیم از نظر اکثر صفات مورد بررسی اختلاف معنی داری وجود نداشت. در کل می توان نتیجه گرفت که هر چند تیمار آبیاری بر اکثر صفات مورد بررسی اثر معنی دار داشت، اما روند تغییرات در دو نوع سیستم آبیاری قطره ای به کار رفته در این آزمایش به یک میزان می باشد.

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