Effect of organic sources and seaweed extract on soil nutrients status after harvest and N content and uptake in kernels of summer groundnut

A field experiment was carried out during summer season of 2022 at College Agronomy Farm, B. A. College of Agriculture, Anand Agricultural University, Anand to study the Response of organic sources and seaweed extract on summer groundnut. The experiment was conducted in Randomized Block Design with 3 replication and 10 treatments viz., 100% RDN through FYM (T1), 100% RDN through Vermicompost (T2), 75% RDN through FYM + Bio NPK (Seed treatment and soil application) (T3), 75% RDN through Vermicompost + Bio NPK (Seed treatment and soil application) (T4), 75% RDN through FYM + seaweed extract 3% (T5), 75% RDN through Vermicompost + seaweed extract 3% (T6), 50% RDN through FYM + Bio NPK (Seed treatment and soil application) (T7), 50% RDN through Vermicompost + Bio NPK (Seed treatment and soil application) (T8), 50% RDN through FYM + seaweed extract 3% (T9), 50% RDN through Vermicompost + seaweed extract 3% (T10). According to results, various treatments of organic sources and seaweed extract had no significant effect on EC (dS/m), pH and organic carbon (%) of soil after harvest of groundnut. Treatment T1 (100% RDN through FYM) recorded significantly higher available nitrogen content in soil (235 kg/ha) after harvest of groundnut, while treatment T6 (75% RDN through Vermicompost + seaweed extract 3%) recorded significantly higher available phosphorus content in soil (38.23 kg/ha) after harvest of groundnut. However, available potassium content in soil after harvest of groundnut was not significantly affected by application of various organic sources and seaweed extract. Significantly higher nitrogen content (4.15%) and uptake (95.28 kg/ha) in kernel was obtained underapplication of 75% RDN through Vermicompost + seaweed extract 3% (T6) The treatments had no significant impact on EC, pH, organic carbon, or potassium content.