Korean Journal of Soil Science and Fertilizer ISSN:0367-6315(Print) 2288-2162(Online) 한국토양비료학회 학회지

Fertilizer recommendation system (FRS) is a useful method for environmentally friendly agriculture. However, the conventional FRS does not deal with organic materials such as green manure and oilcake, which used for domestic organic farming. In this study, we developed an organic material recommendation system (OMRS) using linear programming. This procedure calculates the amount of organic material that maximizes the fertilizer effect under constraints such as N input range and C/N ratio. A combination of two organic materials, including green manure etc., is considered. The procedure was tested in the R statistic program using lp_solve, a library for the mixed integer linear programming solver. Application of this model increased rice yield index than standard rate of fertilizer. This program was also implemented to Korea Soil Information System. This system will be useful for farmers to make decisions that meet their specific needs, such as organic resources, crop nutrient requirements, and environmental regulatory policies.

We developed organic material recommendation system (OMRS) for organic rice paddy soil. Rice grain yield index was increased according to OMRS; 2015 and 2016 were applied to standard application, and then 2017 was applied to the OMRS. OMRS was implemented in KSIS (Korea Soil Information System).