Evaluation of various sources of organic manures on nitrogen use efficiency in rice-rice cropping system

Abstract

Investigations were carried out to study the effect of organic farming with various sources of organic manures and their combinations on nitrogen use efficiency parameters of ADT 36 rice (Oryza sativa L.). The experiments were laid out in randomized block design (RBD) with fourteen treatments, comprising twelve treatment combinations of organic manures, one treatment with recommended dose of chemical fertilizer and the other was absolute control which were replicated three times. The recommended dose of NPK fertilizer was 90: 40: 40 kg ha-1 for Kharif and Rabi rice. The recommended dose of 90 kg N ha-1 was substituted through organics viz., farm yard manure (FYM), Sesbaniarostrata, composted coirpith alone and in combination with neem cake and Azolla. The nitrogen use efficiency parameters such as partial factor productivity (PFP N), agronomic efficiency (AE N), recovery efficiency of applied nitrogen (RE N), physiological efficiency of applied nitrogen (PE N) and internal efficiency of applied nitrogen(IE N) values were high in the treatment receiving FYM + neem cake applied at 90 kg N ha-1 level.

Pig slurry in carpet grass pasture: Yield and plant-available nitrogen

“…The need to fertilize pasture, in view of the high costs of fertilizers, causes farmers to think about the maximization of existent resources naturally found on rural properties (Zanine & Ferreira, 2015). The results provide new information for selecting N application rates to optimize the forage production, as well to subside the use of the manure as alternative N fertilizer on perennial pastures, since the use of organic manure has advantages like nutrient conservation, slow release, improvement of soil physical conditions and enhanced biological activities (Krishnakumar et al, 2013).…”