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Pre-Test in SOIL SCIENCE 50 Items
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The total land area of the Philippines isÂ
The most abundant rock component of the earth‟s crustÂ
The most abundant element found in the earth‟s crustÂ
The percentages of the four major components of the ideal/optimal soil are
The portion of the soil occupied by water and airÂ
The relative distribution of soil separates in a soil mass is called soil texture
The upper diameter size limit of clay particles
Particles larger than 2 mm in size
In a viscous medium, the rate of settling is affected by particle size and temperature of medium.
Soil texture refers to the coarseness or fineness of a soil
Which of these soils has the most rapid percolation rate?
The color of soils indicates some chemical conditions
The bulk density value of an ideal or optimal soil is
Most biological activities would cease and basically inactive at this temperature.
This refers to organic and inorganic matter which are exceedingly small but have high surface area per unit weight or volume
A common denitrifier in the soila
The bacteria that is responsible for the biological oxidation of ammonium (NH4)+to nitrate (NO2)-
Loss of nitrogen in gaseous form from submerged soils
The most efficient organic matter decomposers under acidic condition
The enzyme responsible in nitrogen fixation
Microorganisms that are most active decay of organic substances in soils
A kind of soil erosion in which soil particles are removed on a more or less uniform depth
What are the framework in sustainable land management?
What do you call the mathematical model developed in 1965 which was used to described soil erosion on plants?
If a hectare of corn farm was applied with 5 bags of DAP, 3 bags Urea and 3 bags KCl, how many kilos each of N, P2O5 and K2Owere added?
Nutrient recommendation is derived mainly from
Which one is a synthetic fertilizer?
The amount of growth factor required to produced 50% of the maximum is
Movement of the nutrients from higher to lower concentration.
A fortified organic fertilizer must contain N,P,K the sum of which is not less than
The regulatory body in the manufacture of fertilizer ( inorganic or organic) in the Philippines is
The composting process using earthworm is known as:
Which is not a biological effect of lime in the soil?
What are the kind of lime?
Volatilization occur in this portion of the paddy soil.
What is not true if the soil is submerged?
The likely soil fertility constraints at pH values<5 are
Refers to the resistance of the soil system to drastic change in soil pH
Which one is not true if soil pH decreases?
These elements when present in high amount are phytotoxic.
An acid soil has a Ph value
The conversion of nutrients in organic form to mineral form is
Application of this material increases the CEC of the soil
The proportion of the CEC occupied by exchangeable bases is
Most biological activities would cease and basically inactive at this temperature
The limiting aeration porosity of the soil is
A soil moisture condition wherein all pore spaces in the soil are filled up with water
The color of soils indicates some chemical conditions
Formation of soil aggregates is favored in soils withÂ
The scientific name of African night crawlers is
