How much chemical fertilizer can a ton of organic fertilizer replace?

One ton of organic fertilizer can replace a varying amount of chemical fertilizer, depending on the type of organic fertilizer and its nutrient content. Here are some approximate conversions:

• For general estimation purposes, it is often considered that one ton of organic fertilizer can replace about 100-200 kilograms of chemical fertilizer.
• However, it’s important to note that the nutrient content and availability of organic fertilizers can vary significantly. Some organic fertilizers may have higher nutrient concentrations, while others may have lower concentrations or slower release rates.
• To determine the exact equivalent amount of chemical fertilizer that can be replaced by one ton of a specific organic fertilizer, it is recommended to conduct nutrient analysis of both the organic fertilizer and the desired chemical fertilizer, and then calculate the appropriate conversion ratio based on the nutrient requirements of the crops or plants being fertilized.
• Additionally, factors such as soil conditions, crop types, and application methods should also be considered when determining the appropriate conversion ratio between organic and chemical fertilizers.

• 1 ton of human excrement is equivalent to 25-40 kg of ammonium sulfate, 13-25 kg of calcium superphosphate, and 4-6 kg of potassium sulfate.
• 1 ton of pig manure is equivalent to 17 kg of ammonium sulfate, 21 kg of calcium superphosphate, and 10 kg of potassium sulfate.
• 1 ton of cow manure is equivalent to 16 kg of ammonium sulfate, 16 kg of calcium superphosphate, and 3 kg of potassium sulfate.
• 1 ton of horse manure is equivalent to 28 kg of ammonium sulfate, 19 kg of calcium superphosphate, and 5 kg of potassium sulfate.
• 1 ton of sheep manure is equivalent to 33 kg of ammonium sulfate, 31 kg of calcium superphosphate, and 5 kg of potassium sulfate.
• 1 ton of chicken and duck manure is equivalent to 55-82 kg of ammonium sulfate, 88-96 kg of calcium superphosphate, and 12-17 kg of potassium sulfate.
• 1 ton of rabbit manure is equivalent to 86 kg of ammonium sulfate, 184 kg of calcium superphosphate, and 20 kg of potassium sulfate.
• 1 ton of pigsty manure is equivalent to 23 kg of ammonium sulfate, 12 kg of calcium superphosphate, and 12 kg of potassium sulfate.
• 1 ton of ordinary compost is equivalent to 20-25 kg of ammonium sulfate, 11-16 kg of calcium superphosphate, and 9-14 kg of potassium sulfate.
• 1 ton of aged wall soil is equivalent to 9.5 kg of ammonium sulfate, 28 kg of calcium superphosphate, and 16 kg of potassium sulfate.
• 1 ton of ash from grass and wood is equivalent to 219 kg of calcium superphosphate and 150 kg of potassium sulfate.
• 1 ton of soybean cake is equivalent to 350 kg of ammonium sulfate, 83 kg of calcium superphosphate, and 43 kg of potassium sulfate.
• 1 ton of peanut cake is equivalent to 316 kg of ammonium sulfate, 73 kg of calcium superphosphate, and 27 kg of potassium sulfate.
• 1 ton of cottonseed cake is equivalent to 171 kg of ammonium sulfate, 102 kg of calcium superphosphate, and 19 kg of potassium sulfate.

Common Organic Fertilizer and Application Considerations:

Human excrement is an excellent organic fertilizer with fast-acting effects compared to general organic fertilizers. Fresh human excrement is neutral, rich in nitrogen, and low in phosphorus and potassium. When using it, it should be combined with phosphorus and potassium fertilizers.

Considerations: Prolonged single use can damage soil structure and cause soil compaction. Therefore, it must be fermented and matured before application. Generally, it takes 10 to 15 days of storage to mature.

The storage pit for manure should be located in a shaded area, should not leak water, and should have a cover (to prevent ammonia volatilization). Adding 2-3% calcium superphosphate can fix nitrogen and maintain fertility, while also supplementing phosphorus to improve fertilizer quality.

Stable manure is produced by fermenting and maturing livestock manure, food residues, and fibrous bedding materials. It contains abundant organic matter, usually reaching 15%, and can be as high as 30%.

Considerations: Fresh stable manure contains hard-to-decompose cellulose and lignin, etc. The carbon-to-nitrogen ratio is relatively high, and most of the nitrogen is in an organic form. If fresh stable manure is used directly, it may compete with crops for nutrients and water during the microbial decomposition process.

It is advisable to consult with agricultural experts or soil testing laboratories for more accurate and site-specific recommendations regarding the conversion of organic fertilizers to chemical fertilizers.