CORN Newsletter: 2004-16, June 1, 2004

Crop Recommendation and Observation Network by the Agronomic Crops Team


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C.O.R.N Newsletter 2004-16
June 1, 2004 - June 8, 2004

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Late Planted Crops And Soil Fertility Levels
by Robert Mullen


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With rain keeping many producers out of the field this year, many fields have been planted later than usual. Often questions arise as to the nutrient demand of these late planted crops – do I need as much N? Do I need as much P and K?

Even though the crop is planted late, P and K should be managed as if the crop was planted on time (this goes for both soybean and corn). The nature of P and K is such that yield potential of the crop does not dictate the amount of these two immobile nutrients needed. They simply need to be at levels adequate for maximum production (use Tri-State Fertilizer recommendations to determine rate). This rule also goes for other immobile macronutrients.

Nitrogen rates, on the other hand, should be adjusted. Yield potential of late-planted corn (either typical maturing hybrids or earlier maturing hybrids) is decreased reducing the N demand of the crop (Table 1). Remember, the amount of N needed by a crop is directly related to the yield level of the crop (unlike the immobile nutrients P & K). Thus adjust yield potential and N rates accordingly. If tempted to apply a lot of N, remember late-planted corn typically does not respond well to high N rates, and can be susceptible to lodging.

Table 1. Expected corn grain yields for various planting dates.

Planting Date	Percent Yield
May 1-7	100
May 8-14	100
May 21-28	86
May 29-June 4	79
June 5-10	70

Adopted from Peter Thomison CORN article May 13-20, 2002.

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C.O.R.N. is a summary of crop observations, related information, and appropriate recommendations for Ohio Crop Producers and Industry. C.O.R.N. is produced by the Ohio State University Extension Agronomy Team, State Specialists at The Ohio State University and Ohio Agricultural Research and Development Center. C.O.R.N. Questions are directed to State Specialists, Extension Associates, and Agents associated with Ohio State University Extension and the Ohio Agricultural Research and Development Center at The Ohio State University.

Information presented above and where trade names are used, they are supplied with the understanding that no discrimination is intended and no endorsement by Ohio State University Extension is implied. Although every attempt is made to produce information that is complete, timely, and accurate, the pesticide user bears responsibility of consulting the pesticide label and adhering to those directions.

All educational programs conducted by Ohio State University Extension are available to clientele on a nondiscriminatory basis without regard to race, color, creed, religion, sexual orientation, national origin, gender, age, disability or Vietnam-era veteran status.

Issued in furtherance of Cooperative Extension work, Acts of May 8 and June 30, 1914, in cooperation with the U.S. Department of Agriculture, Keith L. Smith, Director, Ohio State University Extension.

TDD # 1 (800) 589-8292 (Ohio only) or (614) 292-1868


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