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       nutrients from natural resources
       natural or organic origin
       low nutrient compared to fertilisers
       very complex
       30 days  or more to decompose
       organic nutrients contain all nutrients
       don't cause side effects
       example: animal excreta , animal waste plant waste.
           nutrients from artificial fertilizers
           mineral origin
           high nutrient content
           simple salts
           soluble or give rapid response
           only specific nutrient
           causes side effects
           example : urea , super phospate, NH3SO4
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