Discuss fertilizer forms
What will be an ideal response?
ANS:Fertilizers
can be grouped into four categories.
Mineral fertilizers are ground rocks containing nutrients. Dolomitic lime is one example. Most
minerals have low nutrient content and dissolve very slowly, so their usefulness as fertilizers is
limited. Because of low nutrient content and high shipping costs, mineral fertilizers tend to be
expensive per unit nutrient.
Organic fertilizers are organic materials, such as blood meal, that contain nutrients. Can be considered
"slow-release" fertilizers because nutrients are released slowly over the growing season as the organic
matter decays. They tend to be expensive per unit nutrient.
Synthetic organic fertilizers are manufactured by industry but are chemically organic (contain carbon
and hydrogen). Urea is readily available to plants, but others, mostly urea derivatives, are made to be
slow release. Nutrient content is generally high compared to mineral or natural organic fertilizers.
Inorganic fertilizers are mined and processed or manufactured and chemically inorganic. Most dissolve
quickly in the soil for rapid growth response. The concentrated content of inorganic fertilizers reduces
shipping costs, making them generally less expensive per unit nutrient than other sources.
Fertilizers are provided or applied in a number of forms, giving growers several choices of application
methods. The forms can be divided into four main groups: pressurized liquids, fluids, dry fertilizers,
and slow-release fertilizers.
Pressurized liquids—Injected into the soil.
Fluid fertilizers—Can be sprayed, injected into soil, or mixed into irrigation water or with
other crop chemicals.
Dry fertilizers—Include pulverized fertilizers, granules, and prills
Slow-release fertilizers—Dry in form; dissolve in soil solution slowly
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