The principles of crop fertilization plan development according to LAMMC involve several key steps. First, the crop fertilization plan is based on calculating the required amounts of nitrogen (N), phosphorus (P), and potassium (K) to achieve the target crop yields, taking into account soil capabilities. If organic fertilizers are to be applied, nutrient inputs must be adjusted in relation to the rates of mineral fertilizers. The amount of nutrients needed to produce the target yields is calculated according to nationally approved recommended rates and methods. Periodic soil analyses, typically conducted every 3 to 5 years, are used to control the amount of nutrients necessary for sufficient plant nutrition. These analyses include testing soil pH, P, K, and other relevant factors in a lab. The fertilization plan must be developed or revised annually for all fertilized fields on the farm larger than 30 hectares. Additionally, the fertilization plan must be drawn up each year before manure or slurry is applied to the fields, and officials may conduct on-site checks to ensure compliance.