آبیاری و تاثیر آن روی خاک
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)
قسمتی از متن: حفاظت و حراست از خاكها بعنوان عامل مادر تغذیه در عصری كه تزاید جمعیت پیچیده ترین مشكلات را در زمینه كمبود مواد غذائی تشكیل می دهد همراه با فشارهای ناشی از اعمال تكنیك های غلط زراعی در مسیر انهدام و تخریب هرچه بیشتر خاكها تنها وسیله تامین نیازمندیهای غذائی نسلهای آتی را مشخص می نماید. بهره دهی ناكافی خاكها در جهت شورو قلیائی شدن تدریجی كه پیوسته با نقصان مستمر محصولات كشاورزی همراه است توام با نگرش در مشكلات تامین تغذیه انسانها مهمترین مسئله را در دنیای امروز ما مطرح می سازد بطوری كه یك مبارزه منطقی و اصولی در ممانعت از توسعه شورو قلیائی شدن خاكها را اجتناب ناپذیر كرده ضروریت كاوشی در چگونگی گزینش راههای مبارزه معقولانه را كه تضمین كننده بهره دهی وابقاء موجودیت خاك باشد تأكید می كنند. استفاده از آبهای آبیاری با ویژگیهای مشخص در جهت محدود كردن گسترش شوری وتجدید حیات و احیاء خاكهای شور وقلیائی یكی از این طریق مبارزه ای می باشد كه صرفنظر از دیدگاه های اقتصادی با تكینكی آسان بازدهی بیشتر خاكها را میسر ساخته و نتیجتا لزوم بررسی ها و مطالعات عمیقی را روی خصوصیات فیزیكی و شیمیائی آب وخاك كه اساس و شالوده سرمایه گذاریهای عظیم كشاورزی را تشكیل داده و نیز شناخت دقیق مواد شیمیائی موجود در آب آبیاری را برای دست یافتن به حداكثر بهره برداری از خاك ایجاب می نماید.
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فرمت فایل: DOC (ورد 2003) قابل ویرایش تعداد صفحات: 37