T16+notes

T16+notes - Nutrient Deficiencies (Topic 16) Nutrient...

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Nutrient Deficiencies (Topic 16) Nutrient deficiencies are major constraints to commercial plant production, along with drought, disease, and pests. Nutrient deficiencies can be corrected by additions of fertilizer or compost. Commonly Deficient Less common Rarely Deficient N, P, K Fe, B Cl, Ca S, Zn Mo, Mg Co C u , M n What quantities of nutrients are required by crops? Crop Yield Mg/ha N kg/ha P kg/ha K kg/ha Ca kg/ha Mg kg/ha S kg/ha Micronutrients kg/ha alfalfa hay 20 500 45 350 250 50 50 2-7 maize grain 15 200 40 40 20 30 20 0.2-0.4 rice grain 6 80 15 15 5 7 8 0.1 wheat grain 6 120 30 30 25 15 15 0.2 tomatoes 20 150 25 200 10 15 20 0.2-0.4 cotton 2 55 13 17 3 5 6 trace If available plant nutrients are extremely low in concentration visual deficiency symptoms will be obvious. The point between obvious visual deficiency symptoms and the sufficiency range is termed hidden hunger . Additional fertilizer in this zone will result in an increase in the yield.
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This note was uploaded on 01/27/2011 for the course SSO 10 taught by Professor Randydahlgren during the Fall '10 term at UC Davis.

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T16+notes - Nutrient Deficiencies (Topic 16) Nutrient...

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