Tag: soil sample

In agriculture, a soil test is the analysis of a soil sample to determine nutrient and contaminated content, composition, and other characteristics such as the acidity or pH level. A soil test can determine fertility, or the expected growth potential of the soil which indicates nutrient deficiencies, potential toxicities from excessive fertility and inhibitions from the presence of non-essential trace minerals. The test is used to mimic the function of roots to assimilate minerals. The expected rate of growth is modeled by the Law of the Maximum.

Managing for Drought

Managing for Drought

The mania for a green lawn, or in some cases green anything, across many regions of the US has been quelled by recent droughts (thankfully now abating). Even long before water meters were spinning at record rates for golf resorts, private homes, and corporate campuses, scientists have been devising technologies

Insights From the Journey

Insights From the Journey

One of the great gifts of writing is the knowledge that one gains from the research necessary to create intelligent composition. My high school English teacher—who also taught Kurt Vonnegut—once told me that there were seven basic plots in literature and not to worry about outlining a wholly original narrative,

Designing Effective Sediment Basins and Traps

My previous article (Stormwater May 2015) discussed the fallacy of requiring the containment of 3,600 ft.3/ac. (250 m3/ha) to develop sediment basins/traps. While effectiveness of these structures will be 100% when they retain water, it is not realistic to expect this amount of runoff is representative of real-world conditions. This

From Jumping Jacks to Sheepsfoot Rollers – Part 2

From Jumping Jacks to Sheepsfoot Rollers – Part 2

Compaction Techniques
There are basically two ways to compact soil: the static application of heavy loads or the repeated dynamic application of smaller loads at high frequencies. Most compaction equipment utilizes both types of forces. These forces are in turn each divided into two separate techniques for applying these forces:

The Magic Is in the Mix

The Magic Is in the Mix

During the Middle Ages, alchemists were convinced that they had the solution to the world’s problems. All they had to do was figure out the formula for the right mixture. They were trying to turn ordinary substances, particularly straw, into gold. Hydroseeding is several centuries and much scientific knowledge removed

Doing Soil Compaction Right

Doing Soil Compaction Right

One of the most critical elements in building a strong, long-lasting roadway is the compaction of the subgrade, sub-base, and base layers. More than one pavement has failed because the base was inadequate and poorly compacted. Typically, embankment or subgrade compaction comes first. The multiple layers increase in strength with

Constructing an Infiltration Trench Retrofit BMP

In the spring of 2004, an infiltration trench was built on the grounds of Villanova University near Philadelphia, PA. Funded by the Pennsylvania Department of Environmental Protection’s Growing Greener Program and the EPA’s Section 319 Nonpoint Source Pollution Management Program, the trench is the most recent addition to Villanova’s Stormwater

Outdoors But Not Out of Bounds

According to EPA, of an estimated 29 billion gallons of water used daily by US households, 30%—nearly 9 billion gallons—is devoted to outdoor water use. In dry climates, that usage can reach as high as 70%. As such, irrigation is one of the biggest water use concerns for many municipalities.

Urban Floodplain Management

Urban Floodplain Management

Flood events cause more than 3.5 billion dollars, or 90%, of property damage in the United States every year (FEMA 2009). Since 2004, more than 40% of annual natural disasters in the US have been related to flooding. With increasing local, state, and federal expenditures for flood disaster relief, flood

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