Microaerophillic microorganisms require

A soil order characterized as embryonic soil with few diagnostic Features

A soil consists of the three components, namely: solid, liquid and gas

The most influential factor in soil formation

Rocks formed by cooling and solidification of molten magma and Lava in the crust

Soil grown to corn is best cultivated when the soil consistency is

Needed in the synthesis of auxin and is usually deficient in Waterlogged soils.

The fitness of a given type of land for specified kind of land use.

The most abundant gas in the soil atmosphere is

A soil order characterized as shrinking and swelling dark clay soils

Soil formation slows down because of constant mixing within the Profile, nullifying the colloid movement downward by

Component of amino adds such as methionine, cystein, and cystine And is usually deficient in waterlogged soils.

Generally, fine-textured soils are characterized to have

A russian pedologist who published the first soil forming factor equation

The weathered parent material corresponds to this horizon

The mineral supplying p is

The minimum size of delineation is 16 ha to 259 ha. The order of Soil survey is

Soil texture refers to the coarseness or fineness of a soil

The biochemical oxidation of ammonium to nitrate, predominantly By autotrophic bacteria.

Soil texture could be determined in the laboratory by

Iron oxide mineral that contribute red color to many soils

Soil microorganism that degrade carbon – containing pesticide are Considered

What do you expect when you increase OM of the soil?

The size of this soil particle is less than 1 um

The decomposition of the complex substances of rocks and Minerals resulting to changes in chemical composition, release of Soluble materials and formation of new minerals.

A sedimentary rock which is a recemented clay

Characteristic soil structure of sandy soils

The soil is called a because it comes from the weathering of naturally occurring rocks and minerals

Compute the % base saturation of a soil with a CEC of 100 Me/100g and whose exchange sites are occupied by 20 me/100 g Of basiC cations.

Under its natural occurrence a soil is aggregated and porous

The principal form of nitrogen utilized during rapid plant growth Period is

Which of these soils has the most rapid percolation rate?

The physicist who formulated the law governing the rate of Settling particles in viscous medium

The minimum size of delineation is 0.2 hectare to 4 hectare the order of soil survey is

Loose earth materials above solid rock

The non-crystalline organic colloidal fraction of the soil.

Soil texture could be determined by

Calculate the gravimetric moisture content of the soil sample if its Fresh weight (FW) is 25 g and its oven dry weight (ODW) is 20 g.

The true soil correspon ds to horizon

A subsoil with high clay accumulation is written in symbol as

Non-symbiotic N, fixing organisms in lowland soil.

A mean annual temperature of 8t or higher but lower than 15t Defines this soil temperature regime

The resistance of a mineral to abrasion is

Particle density is a stable soil property and most agricultural soils Would have partice densities close to this value

Rocks that are formed when magma id not reach the earth’s Surface but solidifies in the cavities or cracks that the magma had Made by pushing the surrounding rock apart or by melting or Dissolving it.

Available water capacity is calculated as

The major form of nitrogen in the soil is

An example of a 2:1 expanding type of silicate mineral

The molten mass where igneous rocks solidify from is:

Metamorphosis is caused by

It is an amorphous or less crystalline clay developed from volcanic Ash

The source of positive charge of silicate clays.

This will retard soil profile development because it exposes new materials

Andepts are soils that were derived from volcanic activity and Were origin ally classified as Inceptisols. What is the new order of These soils?

An element which is an important component of plant cell wall

The general form of nutrients taken up by plant is

The mean annual soil temperature is 22 tor higher

Nitrification carried out by autotrophic bacteria is not affected by Which of the following?

Generally, coarse-textured soils are characterized as soils with

In strongly acid soils, the availability of most micronutrient cations Is

It refers to the amount of exchangeable cations per unit weight of Dry soil.

Soil texture that would be best for growing lowland rice

Most of the N in the solid fraction of the soil is in the form of

This compound reacts with carbonic acid forming a more soluble Bicarbonate. Its reaction contributes to the weathering process.

The source of permanent negative charge of clays.

This macronutrient is not a component of any organic molecule in The plant; its function is more catalytic in nature and usually Deficient in coarse-textured soils.

Are chemical elements taken up by plants in large quantities

What is the moisture regime of the soil Tropaquepts which are Inceptisols that are found in the tropics?

This horizon is plowed and rich in humus. It will be designated as Horizon.

Water deposited sediments are called

The form of nitrogen taken up by plants from the soil

The relative distribution of sand, silt, and clay is called soil

Nitrate is not removed from the soil system by which of the Following?

The relationship of percent base saturation and soil pH

This regime has mean annual soil temperature of 15t or higher But lower than 22 t.

A soil horizon is defined as

An example of physical weathering process is

These are natural soil aggregates

It refers to the arrangement of primary soil particles into Secondary units or aggregates

Soil Classification System 23. The Philippine adopts the

The primary source of calcium in the soil

Movement of material out of a portion of a soil profile as in an albic horizon

In relation to crop production cdayey soils are known to be

The lowest category of the US Soil Taxonomy is

Represent areas that should be permanently retained as forest Environment

Minerals that are crystallized from the cooling of magma

The study of soil from the standpoint of higher plants or plant

In the soil profile parent material of soil is usually located in

The softest mineral is

Haplauents are young soils with minimal development. In what Order does the soil belong?

A 25 gram soil saturated with 5 me Ca* has a cation exchangeCapacity equal to

The study of rock

In relation to crop production, clayey soils are known to be

Needed in chlorophyll synthesis and usually deficient in alkaline Soil

The weathering that takes place below the soil solum

Which of the following process is not mediated by soil microorganism?

Individual soil layers or layers parallel to the ground surface.

The upper diameter size limit of clay particles is

These are naturally occurring inorganic substances with fairly Definite chemical composition and specfic physical properties

A dynamic natural body on the earth’s surface composed of both Living and non-living materials where plants can grow