Soil fertility and insects are major factors that affect corn yields. The proper kinds and amounts of fertilizers and insecticides when used properly will make corn production more economical on fields where either or both are needed

Corder, George D.

Scheibner, R. A.

English

University of Kentucky

University of KentuckyUKnowledgeAgronomy Notes Plant and Soil Sciences4-1968Fertilizer-Insecticide Mixtures on CornR. A. ScheibnerUniversity of KentuckyGeorge D. CorderUniversity of KentuckyRight click to open a feedback form in a new tab to let us know how this document benefits you.Follow this and additional works at: https://uknowledge.uky.edu/pss_notesPart of the Agronomy and Crop Sciences CommonsThis Report is brought to you for free and open access by the Plant and Soil Sciences at UKnowledge. It has been accepted for inclusion in AgronomyNotes by an authorized administrator of UKnowledge. For more information, please contact UKnowledge@lsv.uky.edu.Repository CitationScheibner, R. A. and Corder, George D., "Fertilizer-Insecticide Mixtures on Corn" (1968). Agronomy Notes. 187.https://uknowledge.uky.edu/pss_notes/187UNIVERSITY of KENTUCKY • COLLEGE of AGRICULTURE c~Ops~-0,~5 AGRONOMY NOTES * s DEPARTMENT of AGRONOMY Lexington 40506 Vol. 1, No. 10 APR 8 f988 LIBRARY T URE & HOME ECOftOllliC!I .. OF AGR!CUL cOLLEG~:. SITY OF KENTUCKY UNIVER FERTILIZER-INSECTICIDE MIXTURES ON CORN R. A Scheibner Extension Entomologist George D. Corder Extension Soils Specialist April1968 Soil fertility and insects are major factors that affect corn yields . The proper kinds and amounts of fertilizers and insecticides when used properly will make corn production more economical on fields where either or both are needed. Is ~fertilizer-insecticide mix the best way to meet the fertility needs and the insecticide needs Q!!. .£QE!!.? The following questions and answers describe the practices where time, rate and placement of fertilizers and insecticides are incompatable. Soil Insects That Attack Corn Soil insects may attack seeds , seedlings and roots of corn . Seed-corn maggots , seed-corn beetles , and wireworms attack the seed while corn rootworms , grubworms , and certain cutworms attack the roots . However , these insects are seldom all a problem in any one year . 1. What Fields Need Insecticides? Fields that have been in grass for 2 or more years are likely to be infested by several of the insects listed above. Thus , if grass sods are plowed for corn, soil insecticides should be used Bottomlands and fields that have been planted to corn several years in succession will probably be infested with root-feeding insects and may also need treatment. 2. What Fields Need Fertilizer and When Can !! Be Applied? Most all corn land in Kentucky needs an application of 1. 2 or all 3 of the major nutrients (nitrogen, phosphorus, and potassium) for the most economical production . Phosphate and potash fertilizers can be applied in the fall, winter or spring. Nitrogen should be applied at or near seeding time. 3. What Insecticide Should Be Used, How Much, and Where Should!! Be Placed? Either aldrin or heptachlor will control soil insects in corn fields. (Dieldrin is no longer registered for use on corn as a soil treatment . ) Aldrin and heptachlor -11'-c, 3 ::> .'71'1 p. ,, yr(o Agricultural and Home Economics Extension Service of the University of Kentucky, the United States Department of Agriculture cooperating. W. A. Seay, Director. Issued in furtherance of the Acts of May 8 and June 30, 1914. -2-as soil applications at or before planting time on corn are registered on a temporary basis until Jan. 1, 1969 or until a residue tolerance is est:::~hlished. If corn is to be followed by soybeans, use heptachlor in preference to aldrin. The granular or liquid formulation of either compound gives equally good control. One pound of actual insecticide per acre placed above the seed in the row, or 2 pounds of actual insecticide broadcast per acre should give control of most soil insects. Diazinon and phorate (Thimet) granules applied as row treatments at planting time or after emergence are effective in controlling corn rootworms that have become resistant to other insecticides. Apply at the rate of 1 pound actual insecticide per acre, or as directed on the pesticide label. Treatments of either of these insecticides give only 1 year protection, but the soil is not contaminated for use for rotation crops. Di -Syston is a systemic insecticide for the control of corn rootworms, aphids and leafhoppers. As 10 percent granules or emulsifiable concentrate it can be applied at planting time, as a side-dress treatment. or as a foliar treatment. Do not apply Di -Syston to corn more than twice a season, regardless of the method of application, or within 40 days of harvest. 4. What Fertilizers Should Be Used and At What Rates? The kind and amount of fertilizers to use on corn should be determined by a soil test and past cropping and treatment history. Thus, it is apparent that each field may need a different kind and a different rate. Treat each field according to its need. 5. Where Should the Fertilizer Be Placed? A row application of fertilizer on some corn land in Kentucky will give good results. When more than 50 pounds of nitrogen plus potash per acre is used at the row, place it in one or two bands 2 inches to the side and 2 inches below the seed to avoid harming germination. When 50 pounds or less of nitrogen plus potash is used at the row, it can be banded on each side, but on the same level as the seed without harming germination. Part or all of the corn fertilizer may be broadcast and plowed down or disked in with good results. If corn is planted in sod (no-tillage), part or all the fertilizer can be broadcast on the surface or applied at the row. LIBRARY I.GRICTJLTURAL SCIENCE CE:N'llE;Ff)lYI-4-68 

Fertilizer-Insecticide Mixtures on Corn

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Fertilizer-Insecticide Mixtures on Corn

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