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Soil Fertility Exam1

QuestionAnswer
What is residue decomposition called that releases nitrogen? Immobilization
What is a benefit of using slow release type fertilizers? reduces losses by leaching can apply on leaves and not burn the plant
What is an advantage of using band fertilizer application vs. broadcast application? You can use HALF phosphorus rates. Stimulates early growth.
What is an advantage of using broadcast fertilizer application vs. band application? It is faster and easier to apply. Higher application rates can be used better for long term.
What is the common fertilizer MAP grade? 11-52-0
What type of soil has the greatest leaching loss potential? Sandy soils
What does a Nitrogen deficiency look like? Yellow on the tips and middle of the leaves
What does a Phosphorus deficiency look like? Purple on the top of the leaves
What is the process of converting nitrogen in organic matter to plant available nitrogen called? Mineralization
What does the fertilizer grade 30-0-3 represent? 30% Nitrogen 0% P2O5 ( Phosphate ) 3% K2O ( Potash )
What is the grade of Anhydrous Ammonia? 82-0-0
What is the process of adding nitrogen to the soil by bacteria in legume root nodules called? Fixation
What is the Cation Exchange Compacity (CEC)? The measure of the soils ability to hold and release positively charged nutrients.
What is the grade 46-0-0? Urea
What type of field condition has risk of dentrification? poorly drained fields
What happens when phosphorus is "tied up"? This means that it has been combined with Ca+, Mg+, Al+, etc. After being combined with these minerals, the phosphorus is insoluble and unavailable for plant uptake.
Which nitrification does N-serve block? NH4+ (Ammonium) -------> NO3- (nitrate)
Other than chlorophyll, what is the other molecule in plants that is composed of nitrogen? Protein, amino acids
What is the best time of fertilizer application to prevent losses? When crops are actively growing
What is the source of nitrogen for making fertilizer? Atmospheric Nitrogen
What is the source of phosphorus for making fertilizer? Mined minerals
What are the plant available forms of nitrogen? NH4+ (Ammonium) NO3- (Nitrate)
What are the plant available forms of phosphorus? PO4- (Phosphate)
Created by: user-2010370
 

 



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