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Ch. 14 Soils and Mineral Nutrition, Cross Connection: As water evaporates…
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Cross Connection: As water evaporates from the soil, more water moves upward, carrying dissolved minerals that crystallize as the water evaporates. When soil water is present, its osmotic potential is extremely negative, as is its water potential. Roots cannot pull water out of such osmotically dry soil; they would die before their water became sufficiently negative.
Cross Connection: Since iron is an immobile element, if a plants suffers from iron deficiency, the little iron present in the plant cannot be transferred from older leaves to younger ones. Therefore, young leaves show the disease symptoms.
Cross Connection: In a field that has been out of production for a year, being fallow helps the soil in many ways. Soil particles break down a bit and release more nutrients ions; the straw from last years crop decomposes and releases nutrients that had been bound in the walls and protoplasm.
