Shifting Cultivation Division, Rain Forest Research Institute, Jorhat-785 001, Assam, India.
A field experiment was carried out for three successive years from 2000–2003 in degraded jhum fallow at Silonijan (Karbi Anglong) Assam to study the impact of integrated use of green manure along with inorganic fertilizer on yield and nutrient status of soil. The treatment combination consisted of Gmelina arborea and Trewa nudiflora as green manure and combined application of green manure along with recommended dose of NPK fertilizer. Study revealed that grain and straw yield of rice increased over control in both the treatment studied and it was found to be more significant in integrated application of green manure and inorganic fertilizer. Combined application of green manure and inorganic fertilizer increased N and K uptake of rice and highest value was recorded as 21.56kg/h in G. arborea and 53.04 kg/h in T. nudiflora treated plot respectively. Significant increase of organic carbon and NPK content of soil was also recorded in combined treatment. From the study it was concluded that G. arborea and T. nudiflora could be used as green manure and when applied with inorganic fertilizer it contributed a lot to improve degraded jhum fallow by increasing productivity and nutrient status of soil.
