Assessment of Soil Fertility Under Integrated Nutrient Management in Rice-Niger Sequence

A field experiment was conducted at the Instructional-cum-Research (ICR) Farm of Assam Agricultural University, Jorhat to assess the effect of integrated nutrient management on available nutrient status of soil under rice-niger sequence. It showed that application of 50 per cent of recommended NPK+50 per cent N FYM and 75 per cent of recommended NPK+25 per cent N FYM were superior treatments and recorded higher available nitrogen and phosphorus for both the layers of soil after harvest of rice and niger. However, the bio-fertilizer based INM package resulted the highest increase in available potassium followed by 75 per cent NPK plus 25 per cent N FYM and 50 per cent NPK with 50 per cent N FYM. A marked build up of available sulphur content of soil was recorded by applying 50 per cent NPK with 50 per cent N FYM, while the integrated nutrient management had a little positive influence on exchangeable Ca and Mg contents of the soil.