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Then , the biomass is burned , resulting in a nutrient-rich layer of ash which makes the soil fertile , as well as temporarily eliminating weed and pest species .
 plant: weed
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
 Entities: weed 
Answer:
 plant: weed