Exam Flashcards
(71 cards)
Tagging of the sample?
Code
Date of sampling
Location
Authors
Purpose of soil sample
Soil fertility evaluation
Pedological studies or characterization
It involves the collection of the composite surface samples from the flow?
Soil fertility evaluation
It collects soil samples from all horizons in a soil profile?
Pedological studies or soil characterization
Used to represent an area or a soil profile?
Soil sample
Four phases of soil testing?
-Sample collection
-Extraction or digestion and nutrient determination
-Interpriting the analytical results
-Fertilizer recommendation.
This should be such that it
reliably reflects the average
status of a field for the
parameter considered.
Sample collection
the procedures
adopted should quantify all portion of
the element in the soil which is related
to the availability to the plant?
Extraction or Digestion and Nutrient determination
The Units of
measurement should
reliably indicate if a
nutrient is deficient,
adequate, or excess?
Interpreting the analytical results
Based upon the soil test
calibrated for field conditions,
and considers other factors
such as yield target, crop
nutrient requirement,
management of the crop, soil
type, and method of fertilizer
application, etc.
Fertilizer recommendations
Types of sample techniques?
-Zig zag
-Random sampling
-Subsampling
Types of sample techniques that are applicable to 1 ha.
Zig zag
Random sampli
Types of sample techniques that are applicable to 15-16 ha.
Subsampling
Present in fine particles of the soil sample?
OM
Nitrogen
Tools and equipment in soil sampling?
Shovel/spade
Soil auger
Pale/ bucket
Plastic bags
Marker
Soil test kit
Any organic or inorganic material of natural or
synthetic origin that is added to the soil to supply one
or more plant nutrients essential to the growth of
plants.
Fertilizer
The guaranteed percentage of total nitrogen (N),
available phosphorus (P2O5
) and water soluble
potassium (K2O) in that order, in a fertilizer material.
Fertilizer grade
The total percentage of nutrients (usually N,P,K, and S) in a
fertilizer material.
Total plant food
A material that is necessary to hold the fertilizer element in a
form suitable for use?
Fertilizer carrier
The amount (kg) of N, P2O5 and K2O recommended per
hectare
Fertilizer recommendations
Classification of Fertilizers according to form?
-Natural or Organic
-Chemical or Inorganic
Classification of Fertilizers according to Fertilizer
Elements Present?
• Single
• Incomplete
• Complete
• Mixed
Classification of Fertilizers under Chemical or Inorganic?
▪ Natural chemical
▪ Synthetic chemical
Any product of either plant or animal origin that has
undergone substantial decomposition and contains
plant available nutrients?
Organic Fertilizer
