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Transcript

Soil Bulk Density

Lesson 6

Ammonification

AvailableWater Holding Capacity

Nitrification

BulkDensity

Denitrification

Respiration

SoilPorosity

Soil Water Filled Pore Space

Gravimetric Water Content

Volumetric Water Content

Soil Build Density: Vocabulary

Lesson 6: Soil Bulk Density

Hover/tap the green leaves to view the definitions and drag each to the appropriate term to complete the tree.

Reveal Answers

Occurs in the nitrogen cycle when soil organisms decompose organic-nitrogen (C-NH2 ) converting it to ammonia (NH4+)

Soil moisture available for crop growth; also defined as the difference between field capacity and wilting point, typically shown in inches/feet.

Occurs in the nitrogen cycle when soil organisms convert ammonia (NH3) and ammonium (NH4+) into nitrite (NO2- ) and next to nitrate (NO3- )-nitrogen which is available to plants.

Weight of dry soil per unit of volume, more compacted soil with less pore space will have a higher bulk density.

Conversion and loss of nitrate (NO3- )-nitrogen as nitrogen gases (N2, N2O, NO) when soil becomes saturated with water.

Carbon dioxide release from soil comes from several sources (decomposition of organic matter by soil microbes and respiration from roots).

Percent of total soil volume made up of pore space.

Percent of pore space filled with water.

Weight of soil water per unit of dry soil weight.

Amount (weight or volume) of water in soil core by volume.

Impact on Soil Health

Lesson 6: Soil Bulk Density

Reveal Answers

Bulk density is...

Bulk density affects...

Ability of water to infiltrate through soilRooting depth of plants Available water capacity Soil porosity Plant nutrient availability Soil microorganism activity

Drag each icon to the appropriate box.

Tap to reveal the hidden words.

infiltrate

Rooting

water

porosity

availability

microorganism

1.2.3.4.5.6.

50%Solids

50%PoreSpace

Water

Organic Matter

Soil Particles

Air

Bulk Density Management Practices

Lesson 6: Soil Bulk Density

increase soil organic matter

decrease compaction

Minimize soil disturbance

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use multi-crop systems

What factors affect soil bulk density?

Soil organic matter

Loose, well-aggregated, porous, high organic matter soils have a lower bulk density

Soil texture

Presence and amount of rock fragment, soil depth, and soil texture affect the water capacity of soil

Density of soil mineral

Sandy soils have a higher bulk density because of less pore space

Aggregates' packing arrangement

  • Avoiding equipment operation on wet soil
  • Using designated roads or rows for equipment transportation

Farmers can minimize soil disturbance by...

Farmers can...

  • Plant crops with a variety of rooting depths

Ammonification

AvailableWater Holding Capacity

Nitrification

BulkDensity

Denitrification

Respiration

SoilPorosity

Soil Water Filled Pore Space

Gravimetric Water Content

Volumetric Water Content

Hover over the leaves to view the correct definitions.

Occurs in the nitrogen cycle when soil organisms decompose organic-nitrogen (C-NH2 ) converting it to ammonia (NH4+)

Soil moisture available for crop growth; also defined as the difference between field capacity and wilting point, typically shown in inches/feet.

Occurs in the nitrogen cycle when soil organisms convert ammonia (NH3) and ammonium (NH4+) into nitrite (NO2- ) and next to nitrate (NO3- )-nitrogen which is available to plants.

Weight of dry soil per unit of volume, more compacted soil with less pore space will have a higher bulk density.

Conversion and loss of nitrate (NO3- )-nitrogen as nitrogen gases (N2, N2O, NO) when soil becomes saturated with water.

Carbon dioxide release from soil comes from several sources (decomposition of organic matter by soil microbes and respiration from roots).

Percent of total soil volume made up of pore space.

Percent of pore space filled with water.

Weight of soil water per unit of dry soil weight.

Amount (weight or volume) of water in soil core by volume.

  • Using no till
  • Using cover crops
  • Using solid manure or applying compost
  • Using high residue crops

Farmers can increase soil organic matter by...

  • Reducing the number of trips across the field with equipment
  • Rotating livestock

Farmers can decrease compaction by...

50%Solids

50%PoreSpace

Bulk density is a measurement of the weight of dry soil per unit volume

Organic Matter

Soil Particles

Water

Air