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What is fertilizer?
chemicals/natural substances added to the soil to increase fertility
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3 major elements used in largest quantities by plants
- Nitrogen
- Phosphorus
- Potassium
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analysis of a fertilizer refers to
its guaranteed content of nutrient elements
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by law, a product sold as fertilizer must list
the guaranteed content of nutrient elements based on weight
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elements are listed on the bags as
percents
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percentages are listed in what order?
N, P, K
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a complete fertilizer has what?
one that has N, P, and K
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an incomplete fertilizer is what?
missing one of the primary plant essential elements (also known as specialty fertilizer)
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Fertilizers affect the soil in what two ways?
either acidic or alkaline affect
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organic fertillizers are made of?
plant or animal waste/residue
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When applied to soil and decomposed,
they provide nutrients to the soil
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when fertilizer is put dry on top of the soil with or without incorporation into the soil
broadcasting
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fertilizer is applied dry along with plant rows/furrows
sidedressing
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sprayed over the soil surface or applied in irrigation water
drilling
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a gas, anhydrous ammonia, is knifed into the soil
gas
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what is the rate of application?
amount of fertilizer applied to a volume or area of soil
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type of nutrients and amount to be applied is determined by
soil test and/or tissue test
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these methods are better because
waiting to see visual deficiency symptoms may be too late
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