Chapter 15 Organic fertilizers
Chapter 15 Organic fertilizers
Concept of organic fertilizers Organic fertilizers-that are derived from the wastes and residues of plants or animals Such as manure, sewage sludge etc Some consist of unprocessed plant materials(such as tree leaves grass clipping, crop residues, and green manure crops Others have been processed, by industry(cannery wastes), by animals(manure, litter, blood, bone, offal+j, sewage sludge))or by microbes(leesYA* from fermentation, composts) Some organic materials, particularly composted manures and sludge, are sold as soil conditioners and do not have a nutrient quarantee stated on the package, although small amounts of nutrients are present
Organic fertilizers – that are derived from the wastes and residues of plants or animals. Such as manure, sewage sludge etc. Some consist of unprocessed plant materials (such as tree leaves, grass clipping, crop residues, and green manure crops) , Others have been processed, by industry (cannery wastes), by animals (manure, litter, blood, bone, offal废物, sewage sludge)) or by microbes (lees渣滓 from fermentation, composts) Some organic materials, particularly composted manures and sludge, are sold as soil conditioners and do not have a nutrient guarantee stated on the package, although small amounts of nutrients are present Concept of organic fertilizers
Characteristics of organic manure Compared to synthetic fertilizer formulations organic fertilizers contain 1. Relatively low concentrations of actual nutrients 2. They have some organic matter 3. The most of nutrient is slow releasing 4. they have more kinds nutrient than mineral fertilizers
Characteristics of organic manure ▪ Compared to synthetic fertilizer formulations, organic fertilizers contain ： ▪ 1. Relatively low concentrations of actual nutrients ▪ 2. They have some organic matter. ▪ 3. The most of nutrient is slow releasing. ▪ 4. they have more kinds nutrient than mineral fertilizers
Benefits of manure 1. The use of manure helps to maintain the organic matter content of the soil Which can improve soil structure and Water infiltration and allows more air to get to plant roots 2. Where organic sources are used for fertilizer, bacterial and fungal activity increases in the soil 3. Nutrient release by microbial activity, in general, occurs over a fairly long time period
Benefits of Manure ▪ 1.The use of manure helps to maintain the organic matter content of the soil which can improve soil structure and water infiltration and allows more air to get to plant roots. ▪ 2.Where organic sources are used for fertilizer, bacterial and fungal activity increases in the soil. ▪ 3.Nutrient release by microbial activity, in general, occurs over a fairly long time period
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 salt
Possible 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