Possible Disadvantages 1. f there is an immediate need for nutrients, organic fertilizer cannot supply them in a hurry 2. Manure commonly contain 4 to 5% soluble salts(dry weight basis)and may run as high as 10%. To illustrate, an application of 5 tons of manure containing 5% salt would add 500 lbs of saltPossible Disadvantages ▪ 1. If there is an immediate need for nutrients, organic fertilizer cannot supply them in a hurry. ▪ 2. Manure commonly contain 4 to 5% soluble salts (dry weight basis) and may run as high as 10%. To illustrate, an application of 5 tons of manure containing 5% salt would add 500 lbs. of salt