Loss of nitrogen (N) as ammonia gas (NH3) is known as volatilization. While volatilization directly from soil can occur, such loss is generally relatively small compared to the amount that can be lost from fertilizers. Volatilization losses can be significant with granular urea and urea-ammonium nitrate (UAN) sources, but the amount of loss varies greatly depending on placement of the fertilizer, soil pH, soil texture, and climatic conditions after application.

The most commonly available nitrogen fertilizer sources used in Virginia are urea, liquid urea-ammonium nitrate (UAN) solution, and ammonium sulfate. Ammonium nitrate is also available in some areas but its use is low relative to urea and UAN solution. Understanding the properties of these fertilizers enables managers to make better decisions as to the most effective way to use these fertilizers as well as to make economic comparisons.

Liquid nitrogen fertilizers have typically been surface applied. This method of application places the fertilizer where the urea nitrogen component of the solution is susceptible to volatilization losses.

While high-quality sod is available outside of the VCIA-certified sod program, the consumer is encouraged to be aware of factors that are important in determining sod quality. Quality sod contains excellent turf varieties with good sod strength (i.e., easy to handle for both harvest and installation) and has no serious insect, weed, or disease problems.

The Shenandoah Valley of Virginia and some other regions produce more manure nutrients than local crops need. This manure has traditionally been applied to row crops and overapplication has led to soil-test phosphorus (P) being well above agronomic optimum in many cases. In 2008, it was estimated that nutrient-management regulations now require that approximately 85 percent of poultry litter be applied off poultry farms, as they do not have sufficient land to beneficially recycle their manure nutrients.

This quick guide is a tool to help Unit Coordinators navigate the process of onboarding a new agent in their local office. This resource clarifies the key responsibilities & roles a Unit Coordinator plays in the onboarding process, as well as tips for a successful experience when welcoming a new agent to the local unit office.

The more than 55 million people who live in the mid-Atlantic region of the United States want to purchase processed grain foods such as bread and other dough products made from hard, or bread, wheat. To meet this demand, regional mills import bread wheat, which comes almost exclusively from the Plains states. These imports make up approximately 30 percent of the total grain needed for the region.

Efficient nitrogen (N) fertilization is crucial for economic wheat production and protection of ground and surface waters. Excessive plant-available N produces wheat plants that are susceptible to lodging and disease with resulting decreased yields and increased input costs. The potential for enrichment of ground and surface waters with nitrates also increases with excessive N fertilizer applications.

Corn must have adequate amounts of nitrogen (N) and phosphorus (P) for profitable production. Nitrogen and phosphorus are also the nutrients that produce excessive algae growth in surface waters when concentrations increase above certain critical levels. Profitable and environmentally sensitive corn production requires that N and P be managed in an efficient manner. Economic returns from the use of these nutrients can be maximized, while the potential for surface and groundwater enrichment with N and P can be minimized with the use of appropriate technology. Available technology includes soil testing to evaluate residual soil nutrient supplies, and the use of proper application rates, methods, and timings.

their yield potential. Research has documented that applying fertilizer phosphorus increases crop growth and yields on soils that are naturally low in phosphorus and in soils that have been depleted through crop removal. Crop fertilization represents the greatest use of phosphorus in agriculture today.

No-tillage corn production has been practiced in Virginia for more than 35 years (Jones et al. 1968), yet many producers have not used no-tillage to its maximum advantage. This publication addresses where no-tillage corn can and should be adopted, and where no-tillage production needs to be modified to reduce production problems associated with continuous use.

Crop production has increased dramatically over the last few decades, much of which has been due to the widespread introduction of chemical fertilizers starting in the mid-1900s. Matching fertilizer application rates to crop needs is an essential component of optimizing crop production. However, different crops in separate fields will require varying rates of the major nutrients – nitrogen (N), phosphate (P2O5), and potassium (potash, K2O) – due to variations in soil types, soil test phosphorus and potassium levels, and nutrient ranges of different crops.

There are many, many factors that could cause either of these statements to be true: year-to-year weather variation, yield potential differences in and between fields, planting date differences, etc. (first published March 2019, last reviewed March 2024)

Soil compaction is a manageable factor that can limit grain or silage yield on many Virginia soils.

Germination of wheat within the grain head before harvest is called pre-harvest sprouting (PHS). Periods of prolonged rainfall and high humidity after the grain has ripened and before it can be harvested can contribute to PHS, which can be thought of as a premature germination.

Modern winter barley cultivars are capable of yields in excess of 170 bu/acre with relatively high test weight. Efficient nitrogen (N) fertilization is crucial for economic barley production and protection of ground and surface waters.

Water makes up 75 to 85 percent of the weight of a healthy grass plant. It is essential for seed germination, tissue formation, plant cooling, food manufacture, and nutrient absorption and transport. A grass plant loses the most water under conditions of high light intensity, high temperature, low relative humidity, and windy conditions.

La fertilización del césped es esencial para la producción de césped de calidad en Virginia. Sin embargo, exceder las tasas recomendadas de aplicación de fertilizante o una frecuencia de aplicación incorrecta puede afectar negativamente la calidad de las aguas superficiales y subterráneas.

By nature, urban areas are frequently undergoing either expansion and/or renovation in both commercial and/ or residential development. Expansive development in rolling topography requires significant soil disturbance. Soils that took millions of years to form are quickly altered and/or removed during construction, eliminating sod cover and forested areas that are naturally occurring water filtration and soil stabilization systems. Expansions in roof area and paved surfaces increase the need for comprehensive stormwater management planning.

The fall season is an important transition period of turfgrass growth and development, and the management of your warm- and cool-season grasses at this time of year means a great deal in terms of anticipated success in your lawn the following spring.

Maintenance Calendar for Warm-Season Lawns in Virginia

Maintenance Calendar for Cool-Season Turfgrasses in Virginia

Moss is a very simple plant that can out-compete turfgrasses under persistently shaded, moist, acidic soils. This publication details the management strategies that make turfgrass more competitive and the chemical management options that help reduce moss populations. This publication also discusses how to propagate and manage moss as part of a shade landscape when turfgrasses are not an option for a lawn.

Harvesting and storing forage at the proper moisture concentration is essential to producing a high-quality product. Ideally, hay forage should have a moisture concentration between 15 percent and 18 percent during baling. Hay baled at higher moisture levels is subject to heat damage, dry-matter loss, mold spoilage, and hay fires. Protein and total digestible nutrient losses are increased for hay baled at lower moisture levels. Baling at the proper moisture level is critical to making quality hay, especially for larger bales (round and square) since moisture and heat dissipate more slowly in comparison to smaller bales.

Animal manures are a good source of nitrogen (N) and phosphorus (P) for agricultural crops, but they have an imbalance in their N to P ratio, so that if they are applied to meet crop N needs, then P is overapplied. For many years, manures have been applied to meet crop N needs, which has resulted in some soils containing more P than crops require, leading to environmental concerns. Regulations have been developed to limit P losses from manures and soils high in P by moving manure nutrient management from an N basis to a P basis.

Hay production and feeding is one of the most expensive components of forage-livestock systems. Specific management practices are necessary to maintain hay quality and minimize hay loss during harvest, transportation and storage of large round bales.

This Extension publication covers the safety aspects of equipment used in large round bale packages such as: balers, front-end loaders, bale handling and transport devices. The key to safe and efficient systems for handling large round bales is an operator who knows the hazards involved and who follows safety practices that can prevent accidents. Operators must be constantly alert for situations that may cause injuries to themselves or others. Besides pain and suffering, accidents contribute to higher costs in terms of unnecessary downtime or costly machine repairs. Alertness and safety consciousness can result in more efficient and profitable baling and handling.

Private water sources such as wells and springs are not regulated by the U.S. Environmental Protection Agency (EPA). Although private well construction regulations exist in Virginia, private water supply owners are responsible for providing maintenance for their water systems, monitoring water quality, and taking the appropriate steps to address problems, should they arise.

Corrosive water can react with minerals and metals that it comes in contact with to “corrode” or dissolve them. Corrosive water is often called “aggressive” water. While consuming corrosive or aggressive water is not in itself dangerous, consuming some of the contaminants that may be dissolved by corrosive water may pose health risks, particularly metals like copper and lead.

Private water sources such as wells and springs are not regulated by the U.S. Environmental Protection Agency (EPA). Although private well construction regulations exist in Virginia, private water supply owners are responsible for providing maintenance for their water systems, monitoring water quality, and taking the appropriate steps to address problems, should they arise.

A perennial with slender, twining stems that may reach 10 feet in length.

Water reuse can be defined as the use of reclaimed water for a direct beneficial purpose.

This publication explains how to obtain representative soil samples and to submit them for analysis to the Virginia Tech Soil Testing Laboratory.

Acid soil limits crop yields on many Virginia farms. This soil acidity can be directly toxic to plants, but more often it reduces the plants' efficiency at nutrient utilization.

Your Soil Test Report and related Soil Test Notes referred to on a report will help you assess your plant’s need for fertilizer and lime.

Most Virginia soils are acidic and require lime applications at three- to five-year intervals. Maintaining the correct soil pH has several benefits, such as encouraging healthy root development and making sure nutrients in the soil are available to the plant. For example, low pH can cause aluminum toxicity and can decrease phosphorus availability.

The only way to accurately predict lime and fertilizer needs in forages is through soil testing, as explained in “Soil Test Note No. 1 – Explanation of Soil Tests,” Virginia Cooperative Extension publication 452-701. See www.soiltest.vt.edu.

Provides essential guidelines for soil testing and management in vegetable and flower gardens.

The procedures for soil analysis used in the Soil Testing Laboratory were established in the early 1950s. A routine test, consisting of eleven separate analyses, is performed on all samples.

Christmas tree production can be an excellent use for reclaimed mined lands in Virginia. Most species do quite well on mine soils because they are more tolerant of infertile and droughty conditions than agricultural or horticultural crops, yet they do respond to active management. Christmas trees can be harvested within seven to 10 years, while timber crops take much longer to mature. For the person with time to invest, Christmas trees can be an ideal way to put small parcels of reclaimed mined lands to profitable use. Individual growers can conveniently maintain up to 5 acres of trees in their spare time.

This publication describes procedures for revegetating surface coal mine reclamation sites with grasses and herbaceous legumes.

This publication describes procedures for re-establishing native forest trees on surface coal mine reclamation sites in southwestern Virginia and elsewhere in Appalachia.

This publication describes procedures for preparing mined lands to serve industrial sites by ensuring adequate geotechnical stability for that purpose, and for converting mined lands that were reclaimed for other purposes to industrial uses.

This publication describes procedures for treating and renovating water quality of acid-mine drainage discharges using "passive treatment" technologies such as constructed wetlands.

This publication describes plant communities occurring on mine sites that were reclaimed during different eras, and using different reclamation methods.

The development of Southwest Virginia’s coal mining region is limited by a lack of building sites. Much of the land in this region consists of steep slopes with shallow soils that are poorly suited to residential development. In recent years, widespread surface coal mining has created landforms that are favorably located and configured to support residential housing. However, because such sites are commonly located beyond the extent of public sewers, developing them requires a means for on-site wastewater treatment and dispersal. This publication is written for homeowners, homebuilders, land developers, public officials, and others who may have an interest in building residential housing or other types of development on mined lands that are not accessible to public sewers.

This publication describes procedures for converting reclaimed mined lands that are unmanaged into productive forest ecosystems with native trees as dominant vegetation.

Virginia’s food system directly impacts the survival and viability of farms and farmland; the economic development of rural and urban communities; the care, restoration, and resilience of ecological resources such as local waterways; and critical health issues. We use the language of community, local, and regional food systems to broadly define a complex and interconnected set of systems and pathways that comprise sustainable food production, processing, distribution, consumption, and waste management to bring about social, economic, and ecological change that benefits all residents.

Many hand tools such as shovels, hoes, rakes, trimmers, and pruners are widely used in lawn care and landscaping. While these tools appear to be harmless, when used improperly, they can cause injuries that sometimes require medical treatment. In 2006, the U.S. Bureau of Labor Statistics reported nearly 205,000 cases of injuries and/or illnesses resulting from the use of hand tools.

In addition to mowers and hand tools, several powered hand tools such as string trimmers, lawn edgers, hedge trimmers, and leaf blowers are widely used in landscaping work. These machines can be dangerous if they are used improperly. A past study has shown that string trimmers and edgers alone cause more than 4,600 injuries that require emergency room treatment each year. About one-third of these cases are eye injuries.

Rotary mowers are very useful types of equipment, but they are dangerous, with the potential to cause serious injuries. Their blades rotate at a high speed of 2,000 to 4,000 revolutions per minute. The equivalent speed at the blade tip or the speed of debris thrown by the mower blade may range from 100 to 200 miles per hour. In order to prevent serious injuries, the operator should be able to disengage the blade and turn the engine off quickly.

Most tractors used in landscaping, lawn care, and golf course maintenance are compact tractors in the 20 to 40 horsepower range. Although these tractors are considerably smaller than farm tractors, they are susceptible to the same types of accidents, with potential for serious injuries or deaths. Causes for such serious accidents are often the same in both cases, and therefore, the steps to take to avoid the accidents are the same.

Utility-type vehicles are popular, multipurpose equipment used for different applications in the lawn care industry. Their hauling capability and versatility have increased their popularity, and they are widely used in rural, suburban, and urban settings for a variety of lawn care, agricultural, construction, and industrial applications.

The goal of this training guide is to reduce the number of accidents and related injuries among the youth workers in the green industry by making workplaces safer. This guide is primarily for employers or supervisors of youth workers in the green industry. In addition to familiarizing the employers/supervisors with the regulations associated with hiring youth workers, the guide discusses the steps they can take to make their work environments safer. It also covers the responsibilities of guardians and youth workers for making workplaces safer.

Mowing lawns continues to be one of the most popular summer job opportunities for youth given the affordable cost and ease in operation of most rotary mowers. However, easy access and widespread use of mowers often creates a false sense of security among the users of these machines. Data from a seven-year period (1996-2003) showed the highest rate of hospitalization from lawn mower injuries was for youth workers ages 15 to 19. The Consumer Product Safety Commission reported that more than 37,000 riding mower injuries occurred from 2003 through 2005 alone. During the same period, there were 95 fatalities due to riding mower tip-over. The purpose of this training guide is to reduce the number of mower accidents and injuries by familiarizing young workers with rotary mowers and their safe operation.

Tractors are versatile equipment used in a variety of jobs ranging from hauling goods to lawn care to agriculture. While they are extremely versatile, they can be very dangerous unless they are used with care following safe practices. Accidents resulting in fatalities and severe injuries are very common during tractor use. The National Safety Council estimated that approximately 36 percent of all the agricultural fatalities in 1997 involved a tractor. Published data also show that farm accidents cause more than 100 deaths and about 2,600 serious injuries among children annually. Tractors account for about 41 percent of the accidental deaths among children under 15 years of age. In spite of these convincing data, a large number of operators continue to follow unsafe practices that can cause serious accidents.

Utility type vehicles (UTVs) are popular equipment used in a variety of settings, including the lawn care industry. Their hauling capacity and versatility have increased their popularity, and they are widely used in rural, suburban, and urban settings for a variety of lawn care, agricultural, construction, and industrial applications. Considering that UTVs are widely used in the green industry, it is extremely important that young workers in the industry become familiar with the safe operation of UTVs. The purpose of this training guide is to familiarize young workers with the safe use of UTVs.

In addition to rotary mowers, many powered hand tools such as string trimmers, lawn edgers, hedge trimmers, and leaf blowers are widely used in lawn care. While these devices are very useful in making jobs easier and more efficient, they can be dangerous if used without proper training and care. In 1989 the U.S. Consumer Product Safety Commission reported that power lawn trimmers and edgers alone have caused about 4,600 injuries annually that required medical attention. About one-third of these were eye-related.

Many hand tools such as rakes, shovels, and pruners are used widely in lawn care operations. While these non-powered tools are not known to cause major injuries, they have the potential for injuries that may require absence from work and/or medical assistance when they are used improperly.

The general purpose of a cover crop is to improve the soil, the broader environment, or other crops in rotation, not for direct harvest. Cover crops, depending on which are selected, are capable of providing many diverse assets. This publication provides a short description of these main benefits.

Cover crops increase soil organic matter, reduce erosion, suppress weeds, forage for nutrients, and reduce fertilizer costs (Clark, 2007). Cover crop species vary greatly and provide varied benefits. Performance evaluation of cover crop species and mixtures is needed in Virginia.

Delaware, Pennsylvania, Maryland, Virginia, and West Virginia, and Virginia, the five states in the Mid-Atlantic region, all require Certified Nutrient Management Plans to be completed for certain agricultural programs.

The mature and dried stem, leaves, and chaff remaining after barley and wheat are harvested is known as straw. Many farmers around Virginia harvest straw by baling in small bales, large round bales, or large square bales that range in weight from 40 to 1,000 lbs. plus per bale.

A forage production trial of commercial barley, oats, rye, triticale, and wheat cultivars has been conducted yearly from 1994-2015 at the Northern Piedmont AREC, Orange. Results from the 2014-15 crop season are presented in this report.

The purpose of this document is to provide guidance on measuring water movement through in situ saturated soil (saturated hydraulic conductivity, or Ksat) as it relates to dispersal and treatment of on-site sewage (wastewater) through an on-site wastewater dispersal area

Composting is a biological heating process that results in the natural degradation of Composting is a biological heating process that results in the natural degradation of organic resources (such as poultry carcasses) by microorganisms. Composting has been successfully used throughout the United States for nearly two decades to control outbreaks of avian influenza. Composting can be effective with most bird types and poultry house designs.organic resources (such as poultry carcasses) by microorganisms. Composting has been successfully used throughout the United States for nearly two decades to control outbreaks of avian influenza. Composting can be effective with most bird types and poultry house designs.

Silvopastures intentionally integrate trees with forage and livestock production in a rotational grazing system. These systems have the potential to improve animal comfort, increase farm resource use efficiency, boost income, and mitigate environmental costs.

The Maryland-Virginia Turfgrass Variety Recommendation Work Group meets each Spring to consider the previous year’s data from Virginia and Maryland National Turfgrass Evaluation Program (NTEP) and ancillary trials and to formulate these recommendations. Virginia and Maryland variety recommendations are essentially identical except for specialized grasses and research situations that differ due to adaptation and state regulation.

There has recently been increased interest in the use of crop residues for different industrial uses in the US and the world. Corn residue is frequently cited as the most likely candidate for alternate industrial uses because of the large area of production and the relatively large amount of residue produced per acre. Among the potential alternate uses for corn stover, biofuel production has received the greatest attention.

Silvopastures — integrated tree-forage-livestock production systems — have the potential to boost farm resource use and income. These systems take advantage of the beneficial interactions among system components, add biodiversity, and increase animal comfort. The intentional and careful combining of trees and livestock in time and space can yield both short-and long-term returns and have positive environmental outcomes.

Phosphorus is a naturally occurring element that is one of 16 elements essential for plant growth and animal health. Research has documented that applying phosphorus in fertilizers or manure increases crop growth and yield on soils that are below critical agronomic levels, as measured during routine soil testing. Although the economic benefits of phosphorus fertilization on crop production are well-documented, too much of a good thing can be detrimental to the environment. Excessive soil phosphorus is a potential threat to water quality.

Early summer often means locally heavy and sporadic rainfall as thunderstorms deliver intense rains, and 2018 appears to be no different with many areas in eastern Virginia receiving 3+ inches of rain in a few days (Figure 1). These storms also often coincide with the timing of sidedress nitrogen (N) and sulfur (S) applications on corn. While some rainfall after sidedress is very beneficial to facilitate N movement into soil, heavy rain (2+ inches) often leaves us wondering how much, if any, of that recently-applied N remains and if additional N is needed.