Demonstration Of Stcr-Ipns Based Fertiliser Prescription For Rice In Sodic Soil

Balanced fertilization using the right kind and amount of fertilisers is made possible using Soil Test Crop Response (STCR) studies. The application of fertiliser by farmers in the field without understanding the soil fertility and nutrient requirement of crops results in negative impact on the soil and crops either through nutrient shortage or toxicity due to excessive or inadequate fertiliser use. Therefore site-specific nutrient management strategies have to be adopted to sustain soil health and to maintain soil fertility in sodic soil. A demonstration trial on STCR-IPNS was conducted during samba season during 2021-2022 in Alathur soil series in Anbil Dharmalingam Agrl. College and Research Institute farm in field No A5a of Trichy with rice variety TRY 3. The result revealed that STCR-IPNS based fertilizer prescription recorded the highest grain yield (5150 kg ha-1) and maintenance of soil fertility. The yield increase in STCR-IPNS (5150 kg ha-1) over blanket fertilizer recommendation and farmer’s fertilization practice was 16.0 and 24.7% respectively. The data on post-harvest soil fertility revealed that the higher available N (235kg ha-1), P (24.5kg ha-1) and K (273kg ha-1) status was observed in STCR-IPNS followed by blanket recommendation and farmers fertilization practice. To get higher yield and soil fertility maintenance and to avoid excess and under usage of fertilizer, the STCR –IPNS fertilizer prescription is highly essential.