Survey on nutrient content of different organic fertilisers

The knowledge of nutrient aspects of organic fertilisers is of much relevance in assessing their availability and long-term effect to the soil and crop and in formulating sound fertiliser recommendation. Around 619 organic fertiliser samples under different categories, which were received by the analytical laboratory of UPASI Tea Research Institute, Valparai, were examined for their nutrient status. The trend in the number of samples received every year for the past 5 years showed that there is a gradual, steady and linear increase in the number of samples received by the laboratory which, in turn, authenticates the increase in the production and utilisation of organic fertilisers in agricultural sector. This also reveals the awareness of organic farming among farmers in recent times. The organic fertilisers received by the laboratory were categorised into different groups based on their nomenclature. The number of samples received each year under different categories varies to a larger extent. The nutritional status was unpredictable based on the nomenclature of the sample received. In addition to this frequency distribution, the nutritional values analysed are discussed in this paper. Correlation matrix was worked out between all the parameters estimated. It is evident that if maintenance of proper carbon-to-nitrogen ratio and moisture content is ascertained in the finished product, one can guarantee the quality of the organic fertiliser in terms of nutrient content.