Conversion of standardized fertilizer
Here is a simple calculation method for the use of standardized fertilizers to convert other fertilizers: standard nitrogen (21% nitrogen), generally iron sulfate, standard phosphorus (1.2% phosphorus), commonly referred to as superphosphate, standard potash, potassium sulfate Potassium nitride and potassium oxide are all about 60%.
At present, there are many kinds of nitrogen and phosphorous fertilizers, and the content varies greatly. Ammonium bicarbonate contains nitrogen 17%, urea nitrogen 47%, calcium superphosphate contains about 11% phosphorus, diammonium phosphate contains more than 42% phosphorus, also contains nitrogen 18 %. There are other compound fertilizers with different contents. According to 50 kg of standard nitrogen fertilizer per acre in wheat, 70 kg of standard phosphate fertilizer is needed. If ammonium bicarbonate, urea and diammonium phosphate are used, how much should be applied?
The calculation method is as follows: A certain amount of chemical fertilizer: Standardized fertilizer dosage Standardized fertilizer content / a certain fertilizer content such as: 50 kg standard nitrogen fertilizer into urea: 5021% ten 47% = 23 (kg) that is 50 kg standard nitrogen fertilizer equivalent to urea 23 Kg again: 70 kg of standard phosphate fertilizer replaced by diammonium phosphate: 70x12% / 42% = 20 (kg) that is 70 kg of standard phosphate fertilizer equivalent to 20 kg of diammonium phosphate, while 20 kg of ammonium phosphate also equivalent to 21 kg of ammonium bicarbonate (Algorithm ibid.) Other analogies.
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