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nutrient management


AGR-1

Lime and Fertilizer Recommendations, 2020-2021

3/18/2020 (major revision)
Authors: Josh McGrath, Edwin Ritchey

Recommended nutrient additions, based on a soil test, are only made when a crop yield or economic response has been measured for that crop under Kentucky soil-climatic conditions. Many field studies have been conducted by the Kentucky Agricultural Experiment Station under Kentucky farm conditions to determine the extent of any primary, secondary, or micronutrient needs. Yield and soil test data from these studies serve as guidelines for establishing recommendations contained in this publication. Recommendations in this publication strive to supply the plant nutrients needed to achieve maximum economic return assuming good management practices.

Departments: Plant and Soil Sciences
Series: Agronomy (AGR series)
Tags: nutrient management, production practices, soil and land
Size: 1.44 mb
Pages: 29



AGR-245

Nitrogen for Kentucky Turfgrasses

2/13/2020 (new)
Authors: Gregg Munshaw, Travis Shaddox

Nitrogen (N) fertilizer is required by turfgrass in larger quantities than any other mineral nutrient because the plant demand for N is high and the supply of N from the natural environment is normally low. In instances where N is not applied according to the University of Kentucky recommendations, applied N can increase the risk of surface and ground water contamination. The objective of this document is to describe the function of N in turfgrass, explain how soil and tissue tests can be used to manage N applications, and to describe the various N fertilizer sources available for application to turfgrass.

Departments: Plant and Soil Sciences
Series: Agronomy (AGR series)
Tags: nursery and landscape, nutrient management, ornamental plants, production practices, turfgrass
Size: 168 kb
Pages: 4



AGR-246

Iron for Kentucky Turfgrasses

12/20/2019 (new)
Authors: Gregg Munshaw, Travis Shaddox

Iron (Fe) is commonly applied using granular or foliar sources to enhance turfgrass color. Iron applications can result in darker green turfgrass as a result of increased Fe uptake or Fe oxidation on the leaf surface. In many cases, Fe results in no turfgrass response at all. Understanding the dynamics of Fe both in the plant and in the soil can enhance your nutrient management programs. The objective of this publication is to explain the function of Fe within the plant, describe the Fe sources available for turfgrasses, and identify which Fe fertilizers are most effective.

Departments: Plant and Soil Sciences
Series: Agronomy (AGR series)
Tags: nursery and landscape, nutrient management, ornamental plants, production practices, turfgrass
Size: 1.78 mb
Pages: 4



AGR-242

Calcium for Kentucky Turfgrasses

12/19/2019 (new)
Authors: Gregg Munshaw, Travis Shaddox

Calcium (Ca) is the dominant cation in all soils of agronomic importance and Kentucky soils are no different. Kentucky soils are naturally high in Ca. Consequently, Ca deficiency in Kentucky turfgrasses is extremely rare, and the probability of observing a Ca response on golf courses, home lawns, sod production, or sports fields is very low. Applying Ca fertilizers to artificially increase soil Ca above the level necessary for proper plant growth normally does not result in an increase in plant uptake because Ca uptake is genetically controlled. Regardless, Ca is commonly applied in both granular and liquid forms.

Departments: Plant and Soil Sciences
Series: Agronomy (AGR series)
Tags: nursery and landscape, nutrient management, ornamental plants, production practices, turfgrass
Size: 112 kb
Pages: 2



AGR-243

Magnesium for Kentucky Turfgrasses

12/19/2019 (new)
Authors: Gregg Munshaw, Travis Shaddox

Magnesium is an essential element for all plants. Soluble magnesium (Mg) exists in soils primarily as Mg2+, a positively charged divalent cation. Kentucky soils are naturally high in Mg and, thus, Mg applications to turfgrass are normally unnecessary. However, turfgrasses grown in sand-based rootzones, such as golf course putting greens and sand-based sports fields, are prone to Mg deficiency. When Mg is necessary, it is essential to understand the function of Mg in the plant, the dynamics of Mg in the soil, and the forms of Mg fertilizers.

Departments: Plant and Soil Sciences
Series: Agronomy (AGR series)
Tags: nursery and landscape, nutrient management, ornamental plants, production practices, turfgrass
Size: 826 kb
Pages: 3



AGR-244

Phosphorus for Kentucky Turfgrasses

12/19/2019 (new)
Authors: Brad Lee, Gregg Munshaw, Travis Shaddox

Phosphorus (P) is an essential plant nutrient and a common component of many turfgrass nutrition programs. Although P application can improve turfgrass quality in some soils, most soils of Kentucky already have adequate plant-available P to support healthy turfgrass growth. What is the function of P within the plant, and how much P is required to sustain acceptable turfgrass in Kentucky? Also, if P applications are necessary, when and how should P be applied?

Departments: Plant and Soil Sciences
Series: Agronomy (AGR series)
Tags: nursery and landscape, nutrient management, ornamental plants, production practices, turfgrass
Size: 481 kb
Pages: 4



ID-163

Agricultural Lime Recommendations Based on Lime Quality

1/13/2016 (major revision)
Authors: David Ditsch, Josh McGrath, Lloyd Murdock, Edwin Ritchey, Frank Sikora

Soil acidity is one of the most important soil factors affecting crop growth and ultimately, yield and profitability. It is determined by measuring the soil pH, which is a measure of the amount of hydrogen ions in the soil solution. As soil acidity increases, the soil pH decreases. Soils tend to be naturally acidic in areas where rainfall is sufficient to cause substantial leaching of basic ions (such as calcium and magnesium), which are replaced by hydrogen ions. Most soils in Kentucky are naturally acidic because of our abundant rainfall.

Departments: Plant and Soil Sciences, Regulatory Services
Series: Interdepartmental (ID series)
Tags: nutrient management, production practices, soil and land
Size: 485 kb
Pages: 6



AGR-212

Fertilizing Your Lawn

7/22/2014 (new)
Authors: Gregg Munshaw

Lawns require fertilizer to remain healthy. Proper fertilization practices will lead to a thick, dark green, uniform lawn that is competitive against weed and disease invasions. The nutrients contained in fertilizers are necessary to support many processes occurring within the plants. If any essential nutrient is limiting, the plants will not perform at their highest level.

Departments: Plant and Soil Sciences
Series: Agronomy (AGR series)
Tags: nutrient management, production practices
Size: 425 kb
Pages: 4



AGR-214

Liming Kentucky Lawns

7/22/2014 (new)
Authors: Gregg Munshaw, Edwin Ritchey

Most homeowners desire an aesthetically pleasing landscape and will take steps to ensure success. Proper fertilizing, watering, and pest control are all steps that will lead to a quality lawn. However, some confusion surrounds when and why lime should be applied to a lawn. Many homeowners believe that lime needs to be applied on an annual basis for a quality lawn. The purpose of this publication is to explain why lime is needed and whether it is required on your lawn.

Departments: Plant and Soil Sciences
Series: Agronomy (AGR series)
Tags: nutrient management, production practices
Size: 909 kb
Pages: 4



AGR-213

Soybean Nutrient Management in Kentucky

4/24/2014 (new)
Authors: John Grove, Carrie Knott, Chad Lee, Edwin Ritchey

Soybean grows best on fertile soils. For decades, the University of Kentucky has conducted field studies to establish the relationship between soil nutrient supplies and soybean yield. Adequate soil fertility must be present so that yields are not limited.

Departments: Plant and Soil Sciences
Series: Agronomy (AGR series)
Tags: farm crops, grain crops, nutrient management, production practices, soybeans
Size: 1.02 mb
Pages: 5



AGR-211

Calibrating Fertilizer Spreaders for the Home Lawn

3/25/2014 (new)
Authors: Gregg Munshaw

How much fertilizer should you use on your lawn? Too much can result in turf burn, wasted product and money, and potential environmental concerns. Too little will result in a low-density lawn that will not be attractive or competitive against weed invasions. To insure that you apply the proper amount of fertilizer to your lawn, you must calibrate your fertilizer spreader. You should calibrate your spreader each time you use a new (different) fertilizer because not all fertilizers have the same particle size or density. The information on the fertilizer bag is a good starting point for the calibration process but remember that spreaders can differ significantly. Calibrating your spreader will take a little bit of work, but the series of fairly simple steps below will help you complete the task.

Departments: Plant and Soil Sciences
Series: Agronomy (AGR series)
Tags: nutrient management, production practices
Size: 2.90 mb
Pages: 4



AGR-210

Fertilizer Management in Alfalfa

1/8/2014 (new)
Authors: David Ditsch, Lloyd Murdock, Edwin Ritchey, Greg Schwab

Alfalfa is a high quality, valuable forage crop that can be successfully produced on most well-drained soils in Kentucky for hay, silage, and grazing. Fertilizing alfalfa can be uniquely challenging because it is a high-yielding crop that removes a tremendous amount of soil nutrients when compared to other crops grown in Kentucky. A thorough understanding of alfalfa's growth habits, nutrient requirements, and soil nutrient supply mechanisms is necessary to effectively manage fertilizer inputs and maximize profitability while minimizing environmental impact.

Departments: Plant and Soil Sciences
Series: Agronomy (AGR series)
Tags: cover and forage crops, farm crops, legumes, nutrient management, production practices
Size: 4 kb
Pages: 4



AGR-204

Soils and Fertility: Kentucky Master Gardener Manual Chapter 4

10/12/2011 (new)
Authors: Brad Lee, Edwin Ritchey

Soil is a mixture of weathered rock fragments and organic matter at the earth's surface. It is biologically active--a home to countless microorganisms, invertebrates, and plant roots. Soil provides nutrients, water, and physical support for plants as well as air for plant roots. Soil organisms are nature's primary recyclers, turning dead cells and tissue into nutrients, energy, carbon dioxide, and water to fuel new life.

Departments: Plant and Soil Sciences
Series: Agronomy (AGR series)
Tags: nutrient management, production practices, soil and land
Size: 1.50 mb
Pages: 24



AGR-185

Nitrogen Transformation Inhibitors and Controlled-Release Urea

4/21/2010 (major revision)
Authors: Lloyd Murdock, Greg Schwab

The soaring cost of fossil fuels is an indicator that nitrogen fertilizer prices are going to remain high for the foreseeable future. With higher N prices, many producers are trying to evaluate the usefulness of several N additive products in their production systems. High N prices make these products more attractive because it takes fewer pounds of saved N to offset the price of the additive. Producers should have a good understanding of how these products work in order to make informed decisions regarding their use.

Departments: Plant and Soil Sciences
Series: Agronomy (AGR series)
Tags: nutrient management, production practices
Size: 500 kb
Pages: 6



AGR-198

Sulfur Fertilization in Kentucky

10/23/2008 (new)
Authors: Greg Schwab

There are a lot of misunderstandings regarding sulfur (S) nutrition for Kentucky crops. Sulfur is considered a seconda r y pla nt nutrient because, although the crop requirement for S is relatively large, it is usually found in soil at concentrations adequate for plant growth and yield so that no fertilizer S is needed. For many years, soil S was maintained by atmospheric deposition. However, more stringent clean air standards require greater removal of S during burning of fossil fuels. That fact, along with increasing crop yields, has caused many Kentucky grain producers to begin to question if S fertilization will increase yield.

Departments: Plant and Soil Sciences
Series: Agronomy (AGR series)
Tags: nutrient management, production practices
Size: 300 kb
Pages: 4



AGR-16

Taking Soil Test Samples

9/4/2007 (reprinted)
Authors: Lloyd Murdock, Greg Schwab, Frank Sikora, Bill Thom

The most important part of making fertilizer recommendations is collecting a good, representative soil sample. Soil test results and fertilizer recommendations are based solely on the few ounces of soil submitted to the laboratory for analysis. These few ounces can represent several million pounds of soil in the field. If this sample does not reflect actual soil conditions, the results can be misleading and lead to costly over- or under-fertilization. It is necessary to make sure that the soil sample sent to the laboratory accurately represents the area sampled.

Departments: Plant and Soil Sciences, Regulatory Services
Series: Agronomy (AGR series)
Tags: nutrient management, production practices, soil and land
Size: 150 kb
Pages: 4



AGR-180

Corn Stalk Nitrate Test

8/27/2004 (new)
Authors: Lloyd Murdock, Greg Schwab

Departments: Plant and Soil Sciences
Series: Agronomy (AGR series)
Tags: corn, farm crops, grain crops, nutrient management, production practices
Size: 136 kb
Pages: 2



AGR-106

Determining the Quality of Aglime: Relative Neutralizing Value (RNV)

12/4/2002 (minor revision)
Authors: Lloyd Murdock, Monroe Rasnake, Greg Schwab, Bill Thom

Departments: Plant and Soil Sciences
Series: Agronomy (AGR series)
Tags: nutrient management, production practices, soil and land
Size: 90 kb
Pages: 2



ID-72

Principles of Home Landscape Fertilizing

3/1/2001 (minor revision)
Authors: Rick Durham, Bill Fountain, John Hartman, A.J. Powell, Bill Thom

Departments: Horticulture, Plant and Soil Sciences, Plant Pathology
Series: Interdepartmental (ID series)
Tags: nutrient management, production practices
Size: 183 kb
Pages: 6



AGR-146

Using Animal Manures as Nutrient Sources

8/1/2000 (minor revision)
Authors: Monroe Rasnake, Frank Sikora, Bill Thom

Departments: Plant and Soil Sciences
Series: Agronomy (AGR series)
Tags: nutrient management, production practices
Size: 330 kb
Pages: 4



AGR-5

When to Apply Lime and Fertilizer

9/1/1996 (minor revision)
Authors: Ken Wells

Departments: Plant and Soil Sciences
Series: Agronomy (AGR series)
Tags: nutrient management, production practices, soil and land
Size: 143 kb
Pages: 4



AGR-168

Broiler Litter Production in Kentucky and Potential Use as a Nutrient Source

7/1/1996 (new)
Authors: Monroe Rasnake

Departments: Plant and Soil Sciences
Series: Agronomy (AGR series)
Tags: nutrient management, production practices
Size: 66 kb
Pages: 4



AGR-163

Selecting the Right Fertilizer for Tobacco Production in Float Systems

2/1/1996 (new)
Authors: Gary Palmer, Bob Pearce

Departments: Plant and Soil Sciences
Series: Agronomy (AGR series)
Tags: farm crops, nutrient management, production practices, tobacco
Size: 180 kb
Pages: 2



AGR-103

Fertilization of Cool-Season Grasses

3/5/1995 (reprinted)
Authors: Charles Dougherty, Lloyd Murdock, Ken Wells

Departments: Plant and Soil Sciences
Series: Agronomy (AGR series)
Tags: cover and forage crops, farm crops, grasses, nutrient management, production practices
Size: 16 kb
Pages:



AGR-151

Evaluating Fertilizer Recommendations

3/1/1995 (reprinted)
Authors: Lloyd Murdock

Departments: Plant and Soil Sciences
Series: Agronomy (AGR series)
Tags: nutrient management, production practices
Size: 236 kb
Pages: 5



AGR-19

Liming Acid Soils

3/1/1995 (reprinted)
Authors: Lloyd Murdock, Monroe Rasnake

Departments: Plant and Soil Sciences
Series: Agronomy (AGR series)
Tags: nutrient management, production practices, soil and land
Size: 10 kb
Pages:



AGR-43

Nitrogen in Kentucky Soils

3/1/1995 (reprinted)
Authors: J.L. Sims, Scott Smith, Ken Wells

Departments: Plant and Soil Sciences
Series: Agronomy (AGR series)
Tags: nutrient management, production practices, soil and land
Size: 290 kb
Pages: 8



FOR-24

Kentucky Christmas Tree Production Workbook Fertilization

9/27/1991 (reprinted)
Authors: Bonnie Appleton, Deborah Hill

Departments: Forestry and Natural Resources
Series: Forestry (FOR series)
Tags: nutrient management, production practices
Size: 5 kb
Pages:



AGR-49

Liming and Fertilizing Burley Tobacco

4/1/1987 (new)
Authors: J.L. Sims, Ken Wells

Departments: Plant and Soil Sciences
Series: Agronomy (AGR series)
Tags: farm crops, nutrient management, production practices, tobacco
Size: 33 kb
Pages:



AGR-105

Fertilization and Liming for Corn

2/1/1983 (new)
Authors: Scott Smith, Scott Smith, Ken Wells

Departments: Plant and Soil Sciences
Series: Agronomy (AGR series)
Tags: corn, farm crops, grain crops, nutrient management, production practices
Size: 21 kb
Pages:



AGR-23

Tobacco Stalks and Stems Fertility Value and Use

5/1/1979 (reprinted)
Authors: W.O. Atkinson, Jones Smiley

Departments: Plant and Soil Sciences
Series: Agronomy (AGR series)
Tags: farm crops, nutrient management, production practices, tobacco
Size: 6 kb
Pages:



AGR-11

Potassium in Kentucky Soils

2/1/1979 (new)
Authors: Lloyd Murdock, Ken Wells

Departments: Plant and Soil Sciences
Series: Agronomy (AGR series)
Tags: nutrient management, production practices, soil and land
Size: 24 kb
Pages: