Transcription of Nutrient Deficiencies and Application Injuries in Field Crops
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Nutrient Deficiencies and Application Injuries in Field Crops
integrated Pest ManagementNutrient DeficienciesandApplication InjuriesinField CropsJohn SawyerDepartment of AgronomyIPM 42 Revised July 2004 Nitrogen deficiency in cornPotassium (K) deficiency is first seen as a yellowingand necrosis of the corn leaf margins, beginning on thelower leaves. Symptoms usually don t appear for sometime after planting (about 4 to 6 weeks, around the V6growth stage). If the deficiency persists, symptomsprogress up the plantbecause potassium ismobile in the plantand translocates fromold to young potassiumdeficiency is severe,older leaves turnyellow with tissuenecrosis along themargins, but the uppernew leaves may remaingreen.
Integrated Pest Management Nutrient Deficiencies and Application Injuries in Field Crops John Sawyer Department of Agronomy IPM 42 Revised July 2004 ... highly weathered acid soils; or by very high magnesium and potassium and very low calcium on the cation exchange complex. Magnesium (Mg) deficiency is first seen as yellow to white interveinal
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