In a study, urine - a good source of nitrogen and wood ache - rich in minerals has been successfully used to fertilize corn, cabbage, cucumber and other crops and also reducing acidity of acid soils. This combination can be used in substitute for mineral fertilizer to increase the yields of tomato without posing any microbial or chemical risks
Reference:
Pradhan et al. Stored Human Urine Supplemented with Wood Ash as Fertilizer in Tomato (Solanum lycopersicum) Cultivation and Its Impacts on Fruit Yield and Quality. Journal of Agricultural and Food Chemistry, 2009; 57 (16): 7612 DOI: 10.1021/jf9018917
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