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MacroNutrients 1 - Macronutrients Nitrogenxingnodules...

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Macronutrients
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Nitrogen fixing nodules h4p://blog.lib.umn.edu/denis036/thisweekinevoluAon/ 2007/08/cooperaAon_gets_complex_1.html
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ESSENTIAL ELEMENTS We are learning that soils are very complex medium many reacAons occurring the system as a whole in a constant state of flux.
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Add the further complicaAon of plants, plant uptakes and plant needs the situaAon can become even more complex plants all need slight differences
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generalizaAons SO we need to make generalizaAons that do not fit all the plants all of the Ame they may not even be true for any one plant in a given situaAon
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Essen8al element element needed for the growth and reproducAon of most plants. FIGURE 15‐1
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Essen8al element Sixteen are currently accepted: C carbon H hydrogen O oxygen P phosphorus K potassium N nitrogen S sulfur Ca calcium Fe iron Mg magnesium B boron Mn manganese Cu copper Zn zinc Mo molybdenum Cl chlorine
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C, H, O macronutrients We don't usually ferAlize with CHO H and O from water, and C and O from the air, O from soil air. Other elements are also called fer8lizer elements .
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Macronutrient essenAal element needed in large quanAAes. Primary N, P, and K MOST FERTILIZERS Secondary Ca, Mg and S
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Micronutrient trace element essenAal element needed in Any amounts. Mn, B, Cu, Zn, Mo and Cl. Fe needed in much larger amounts than others in Assue culture it may be considered a macronutrient.
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Mobile element ‐ plant nutrient that is translocated to young growth if a deficiency occurs. Therefore, deficiency symptoms appear first on older growth. N, P, K, Mg, Mo, possibly S a li4le. N deficiency
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Immobile element ‐ plant nutrient that is not translocated to young growth in a deficiency situaAon. Therefore, deficiency symptoms appear first on young growth. Fe, Ca, B, Zn, Mn, Cu, Cl, S to some extent. Mn deficiency
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Mobile element ‐ soil nutrient that is moved easily in the soil Can be lost to leaching N deficiency
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Immobile element ‐ soil nutrient that is not in a form readily available for plant P
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Nutrient balance is just as important as the absolute amount of any nutrient.
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NITROGEN Single most important for plant growth, acer water especially leaves and fruit used for N is in all amino acids, so in all proteins, so in all enzymes; also in nucleic acids, chlorophyll and many other compounds.
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Mobile (in plant and soil) so foliar symptoms appear first on older leaves. corn
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N deficiency: Symptoms: Plant small
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N deficiency: Symptoms: Underground parts small, too (roots, bulbs...)
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