Olsen method is used for determination of available P of neutral or alkaline soils.

Which among this mineral does not contribute any soil nutrient?

Involved in energy storage in the plant and is constituent of phospholipids, nucleoproteins, and is deficient in acid upland soil.

This micronutrient is needed in nitrogen fixation by leguminous plant and is usually deficient in acid upland soil.

Soil generally posseses a net positive charge.

He introduced the factors of soil formation

Permanent wilting point is the lower limit of the available moisture range

Capillarity is the ability of a liquid to flow against gravity

Soil conditions which can reduce the ferric to ferrous, hence, making the iron-phosphate complex more soluble

The percentage of mineral in the soil.

Low CEC correspond to low nutrient retention capacity

A type of soil survey where the size of mapping unit is 0.5 to 4 hectares

Accumulation on the mineral soil surface of organic litter and associated humus to a depth of less than 30 cm

A type of soil survey which procedures maps with scale of 1:15, to 1:5,000.

The most important cause of soil degradation.

Clayey soils generally have higher CEC than a sandy soil.

The process by which one plant infuses the soil with a chemical that effects the growth of others plants.

A basic cation which inhibits aggregation

The attraction of water for soil particles.

The pH range 6.6 to 7.3 is considered neutral

The sum of all tillage operations, cropping practices, fertilizer, lime and other treatments conducted on, or applied to a soil for the production of plants

One important practical application of soil survey is to match it with the basic requirements production systems. This is referred to as:

A soil condition usually associated with a salinity problem is

The most important aluminum oxide in soils.

An organic fertilizer material which had been enriched with microbial inoculants, hormones, and/or chemical additives to increase its nutrient content.

The horizon with the maximum leaching of constituents

The abrupt change and texture or mineralogy in the soil profile is termed

The rock that has been weathered but has retained the general rock structure is called

Which crop is not capable of N-fixation?

At permanent wilting point, water is held at a tension of

The law governs the diffusion of gasses in soil.

The acronym ESP means

It is an indicator of biological activity in the soil.

The most common iron oxide in soil

At low moisture content in the soil, moisture tension is

If a crop residue contains 60% organic carbon and 5% total nitrogen, its C/N ration is

Which of the following microorganisms is very sensitive to potassium levels in soil and therefore useful in diagnosing potassium deficiency?

The soil temperature regime when the average annual temperature is more than 22⁰C and the difference between mean summer and mean winter is less than 5⁰C.

These are soil formed from volcanic ash and young volcanic materials

The major group of soil microorganism where molds and mushroom belong

Leaves and stems accumulate in the forest. Remnants of annual and perennial grasses are trampled in a pastureland. These illustrate how the kind and amount of organic materials decomposed can affect soil formation. Which soil formation faction is being described here?

Erosion which is prevalent on river bodies

An instrument that is used to locate contour lines in a slopping area

The charge produced when the soil is too acid

This ions aids in the dispersion of colloids

Imparts a yellowish color to soils.

The water in the largest pores that percolate downward

The amount of moisture in a dry soil.

The most active agent of soil erosion process in the Philippines and other areas in the humid tropics.

These are well-developed soil with low base saturation common in forest and upland areas.

Infiltration is a downward entry of water via the soil surface

The first step of soil erosion by water.

It refers to the true soil

It is the chemical dispersing agent during textural analysis.

Rocks formed from the solidification and crystallization of magma.

It is considered as the start of aggregation

Rocks that were formed from the partial melting of existing rocks due to heat, pressure chemical action.

The soil moisture regime that is characterized by water saturation

The oven-drying of soil samples is normally done at this temperature

The process by which soil nutrients are washed down by water from the root zone of the plants.

Growing of several crop species on a piece of land in spatial arrangement.

Biological control of soil erosion.

Which of the following soil organism are acid loving?

Well-drained slopes would

A soil has a pH of 5.5 and CEC of 20 me 100g. the grower needs to lime the soil to pH 6.5, if the % BS at pH 5.5 is 50%, and 75% at pH 6.5, calculate the amount of CaCO₃ required to raise the pH of 1 hectare of soil.

A cabbage plant needs 240 kg N per hectare. How many kilograms of 21-0-0 is needed to satisfy the requirement?

Once a soil has been placed under cultivation, its organic matter content usually

It describes the formation of the mafic minerals ( olivine, pyroxene, amphibole and biotite ) each taking turns to form as the temperature progressively decreases

It is a characteristic of rainfall that falls per units time usually expressed in millimetre per hour

Equilibrium reaction between a metal ion and a complexing agent characterized by bond formation between the metal and complexing agent.

Refers to total concentration of inorganic solids and is usually expressed in mgL^-1 or ppm

It describes the evolution of the plagioclase feldspar as they evolve from being calcium rich to more sodium rich.

The net accumulation of materials at the interface between a solid phase and an aqueous solution phase is called

A greenhouse gas that is produced by the decomposition of organic matter in wet soils such as in rice paddies.

It is the systematic examination, description, classification, and mapping of the soils n a given area

It states that the yield of the plant is regulated by the nutrient present in the lowest amount relative to its optimum requirement.

Which is not a characteristics of upland soil?

Type of chemical weathering that takes place within the soil solum.

Soil dominated by kaolinite are good bases for roadbed and building foundations,

[H⁺] increases as pH increases

Iron toxicity is commonly observed din this type of soil:

Chemoautotrophs are those organisms which derive their energy from

Sodium rich soil are in depressed state.

A 1:100 soil-water dilution means that one part of soil is suspended in

The amount of molecular nitrogen ( N₂ ) in the atmosphere is about

A type of microscope which provides 3- dimensional view of the soil microorganisms is called

The geologic or organic precursor of the soil.

The total number of soil orders classified under the soil taxonomy

A surface layer that is dark colored, with more than 1 percent organic matter and typically friable granular structure.

Unit layers of kaolinite are held together tightly by H-bonding

The time at which the development of soil begins

Which among the following has the highest N and P contents?

The property of the soil that enable water, or roots to move through it

A soil temperature regime wherein the mean annual soil temperature is 22^oC or higher and the difference between mean summer and mean winter temperature is less than 5⁰C.

The following can be used as contour hedges except one

A relatively new term for an old practice of planting agricultural crops along with or in sequence with woody perennial. This can provide a better source of income for the community