Proceedings :: North Central Soil Fertility Conference

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Oschwald, W.R

Daverede, I.C

Sheridan, A.H

Walters, D

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Authors

Oschwald, W.R

Daverede, I.C

Kravchenko, A.N

Hoeft, R.G

Nafziger, E.D

Bullock, D.G

Warren, J.J

Gonzini, L.C

Dobermann, A

Ferguson, R

Hergert, G

Shapiro, C

Tarkalson, D

Walters, D

Wortmann, C

Kitchen, N.R

Sudduth, K.A

Drummond, S.T

Sheridan, A.H

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Oral

Year

1986

2002

2006

2010

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Filter results4 paper(s) found.
1. New Techniques and Methods of Disseminating Information in View of Budgetary Constraints by the University of Illinois The Cooperative Extension Service a t the University faces increased demands for educational services. This increaase is in an environment marked by increasing costs, and stable to decreased financial support--especially from the Federal partner. The situation we face in Illinois is similar to that faced by many other State Cooperative Extension Services. We are better o f f than some states--worse o f f than others. What of the future? Will we be able to deliver viable programs to farmers and agri-business... Download paper
2. Phosphorus Runoff From Incorporated and Surface-Applied Fertilizer and Manure Continued inputs of fertiher and manure in excess of crop requirements have led to a build-up of soil phosphorus (I?) levels, creating an environmental rather than agronomic concern (Sharpley et al., 1994). The objective of this study was to evaluate the effects of soil test P level, source of P amendments, tillage, and manure application method on P runoff from agricultural soils. The treatments consisted of swine manure surface applied and injected at rates of 29 and 59 Ib acre-' of P, and triple... Download paper
3. Should We Abandon Soil Testing and Yield Goals in Estimating Nitrogen Rates for Corn If the prices of corn and fertilizer-N and the shape of the N response function relating crop yield to the amount of fertilizer used are known, calculating an economically optimal N rate (EONR) for maximizing the net return to applied N is straightforward: the EONR is the N rate at which no firher increase in net return occurs. In most cropping systems and under common price scenarios, crop yield at the EONR is within 95 to 99% of the maximum yield obtained for the specific management package. In... Download paper
4. What Do You Do When Your N-Rich Reference Fails? In recent years, canopy reflectance sensing has b een investigated for in-season assessment of crop N health and fertilization. Typically, the procedure followed co mpares the crop in an area known to be non-limiting in N (the N-rich area) to the crop in a target area, which may be inadequately fertilized. Measurements from the two areas are used to calculate a relative reflectance to represent the potential need for add itional N fertilizer. Establishing N rich areas or strips is often inconvenient... Download paper

Filter results4 paper(s) found.

1. New Techniques and Methods of Disseminating Information in View of Budgetary Constraints by the University of Illinois

The Cooperative Extension Service a t the University faces increased demands for educational services. This increaase is in an environment marked by increasing costs, and stable to decreased financial support--especially from the Federal partner. The situation we face in Illinois is similar to that faced by many other State Cooperative Extension Services. We are better o f f than some states--worse o f f than others. What of the future? Will we be able to deliver viable programs to farmers and agri-business...

Download paper

2. Phosphorus Runoff From Incorporated and Surface-Applied Fertilizer and Manure

Continued inputs of fertiher and manure in excess of crop requirements have led to a build-up of soil phosphorus (I?) levels, creating an environmental rather than agronomic concern (Sharpley et al., 1994). The objective of this study was to evaluate the effects of soil test P level, source of P amendments, tillage, and manure application method on P runoff from agricultural soils. The treatments consisted of swine manure surface applied and injected at rates of 29 and 59 Ib acre-' of P, and triple...

Download paper

3. Should We Abandon Soil Testing and Yield Goals in Estimating Nitrogen Rates for Corn

If the prices of corn and fertilizer-N and the shape of the N response function relating crop yield to the amount of fertilizer used are known, calculating an economically optimal N rate (EONR) for maximizing the net return to applied N is straightforward: the EONR is the N rate at which no firher increase in net return occurs. In most cropping systems and under common price scenarios, crop yield at the EONR is within 95 to 99% of the maximum yield obtained for the specific management package. In...

Download paper

4. What Do You Do When Your N-Rich Reference Fails?

In recent years, canopy reflectance sensing has b een investigated for in-season assessment of crop N health and fertilization. Typically, the procedure followed co mpares the crop in an area known to be non-limiting in N (the N-rich area) to the crop in a target area, which may be inadequately fertilized. Measurements from the two areas are used to calculate a relative reflectance to represent the potential need for add itional N fertilizer. Establishing N rich areas or strips is often inconvenient...

Download paper