Possible Disadvantages 3. Weed seeds are common in some manure 4. One should avoid using pig, dog or cat feces because of the problems involved with internal parasitic worms as 生虫 which may be transferred to humans if not composted 5. The possibility of nitrogen depletion is another drawback of organic fertilizers
▪ 3. Weed seeds are common in some manure. ▪ 4.One should avoid using pig, dog or cat feces because of the problems involved with internal parasitic worms寄 生虫 which may be transferred to humans if not composted. ▪ 5. The possibility of nitrogen depletion is another drawback of organic fertilizers. Possible Disadvantages
Possible Disadvantages 6. An application which is too heavy or too close to the roots of the plants, especially immature manure may cause burning ( actually a process of desiccation千燥by the chemical salts in the fertilizer)生粪咬苗 7. The nutrient concentration of organic manure can vary widely, and information on the amount of nutrients and the exact elements in an organic fertilizer is not readily available to the farmers
▪ 6. An application which is too heavy or too close to the roots of the plants , especially immature manure may cause “burning” (actually a process of desiccation干燥 by the chemical salts in the fertilizer)生粪咬苗. ▪ 7. The nutrient concentration of organic manure can vary widely, and information on the amount of nutrients and the exact elements in an organic fertilizer is not readily available to the farmers. Possible Disadvantages
Farmyard manure(GFYM)厩肥 FYM is a mixture of partially decomposed straw containing faeces and urine The production of livestock slurries has thus increased The nutrient concentration of organic manure can vary widely depending much on their source and moisture
Farmyard manure (FYM)厩肥 ▪ FYM is a mixture of partially decomposed straw containing faeces and urine. ▪ The production of livestock slurries has thus increased. ▪ The nutrient concentration of organic manure can vary widely depending much on their source and moisture
Characteristics of farmyard manure Manure is an excellent fertilizer containing nitrogen, phosphorus potassium and other nutrients It also adds organic matter to the soil which may improve soil structure, aeration, soil moisture-holding capacity, and water infiltration
Characteristics of farmyard manure ▪ Manure is an excellent fertilizer containing nitrogen, phosphorus, potassium and other nutrients. ▪ It also adds organic matter to the soil which may improve soil structure, aeration, soil moisture-holding capacity, and water infiltration
Nutrient concentrations in organic manure K Ca Organic manure moisture mg/g fresh matter FYM 760 5.0 54 42 Cattle slurry 0.7 3.2 Pi 1g Slurry 2.0 1.0 2.0 Sewage sludge 550 8.3 2.2 0.4 0.7
Nutrient concentrations in organic manure1 N P K Ca Mg Organic manure moisture mg/g fresh matter FYM 760 5.0 1.1 5.4 4.2 1.1 Cattle slurry 930 3.1 0.7 3.2 1.1 0.4 Pig slurry 970 2.0 1.0 2.0 - - Sewage sludge 550 8.3 2.2 0.4 0.7 -