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علوم خاک soil-science - اثر عملیات کشاورزی بر روی ساختار خاکEffect of agricultural operations on structure soil
علوم خاک soil-science
پیش به سوی کشاورزی پایدار با نگرش صحیح به خاک

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اثر عملیات کشاورزی بر روی ساختار خاکEffect of agricultural operations on structure soil

اثر عملیات کشاورزی بر روی ساختمان خاک

عملیات زراعی مانند شخم اثرات مفید و گاهی هم اثرات مفی برروی ساختمان خاک باقی می گذارد. از بین بردن علف های هرز و کنترل آنها و برگرداندن بقایای گیاهی به توده خاک و مخلوط شدن خاک با مواد آلی و تشکیل خاکدانه از اثرات مثبت شخم است. از طرفی دیگر ممکن است خاکدانه های موجود در خاک توسط فشار چرخ های تراکتور و ماشین آلات سنگین مثل غلطک از بین برود و اثرات منفی بر روی ساختمان خاک بر جای بگذارد هر اندازه رطوبت خاک بیشتر باشد متراکم شدن و از بین رفتن خاکدانه ها به وسیله ماشین آلات کشاورزی زیادتر است و حتی ممکن است تا عمق 60cm نیز برسد.
هر چه تعداد شخم زدن کمتر باشد میزان محصول افزایش بیشتری پیدا می کند تا آنجا که یک بار شخم زدن بهترین اثر را دارد.
جدول زیر میزان تولید چغندر در رابطه با تعداد دفعاتی که زمین قبل از کاشت مورد اعمال زراعی قرار گرفته است.

تعداد دفعات انجام عملیات زراعی 0 1 2 3 4 5 6
مقدار محصول بر حسب تن در 14 8/16 7/16 2/15 8/14 2/14 3/14

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