Keshar Bahadur Khatri1, Roshan Babu Ojha2, Keshab Raj Pande1
1. Department of soil science and agri-engineering, Faculty of Agriculture, Agriculture and Forestry University, Rampur, Chitwan, Nepal.
2. Soil Science Division, Nepal Agricultural Research Council, Khumaltar, Lalitpur, Nepal.
Abstract: Nitrate leaching is a problem in medium textured Inceptisols of Chitwan district, Nepal. A field experiment was conducted in sandy loam soil of Agriculture and Forestry University, Rampur, Chitwan, Nepal from October 2016 to January 2017 to evaluate effect of different sources of organic manure in nutrient risk management. The experiment was carried out in a Randomized Complete Block Design with six treatments ( Poultry manure, goat manure, FYM, biogas byproduct, recommended dose of fertilizer and control ) replicated four times. Pyuthane Red variety of radish was used as a test crop. After analysis of primary nutrients of the organic manures, rate of manure was fixed on the basis of nitrogen content. The highest (49.41 Mg/ha) root yield was obtained from poultry manure application which was similar with recommend rate of fertilizer. The highest soil pH (4.722), moister content (15.82), CEC (10.41meq/100g soil) and soil porosity (49.33%) and the lowest bulk density (1.191g/cm3) was obtained from poultry manure application. The highest organic matter content (1.01%) was observed from biogas byproduct application which was similar with FYM and poultry manure application. The highest infiltration rate (0.522 mm/sec) was obtained from FYM whereas the lowest was obtained from control plot. In 30 cm soil depth, the residual NO3-N was highest (0.075%) from goat manure which was similar with poultry manure application where as in 60 cm soil depth highest (0.046%) NO3-N was recorded from RDF which was similar with biogas byproduct and goat manure application whereas lowest (0.46%) was recorded from control which was similar with FYM and poultry manure application. The most of the soil properties were enhanced by application poultry manure and FYM. Furthermore, poultry manure played an important role in increasing nitrate nitrogen availability in upper depth and reduces the potentiality of nitrate nitrogen leaching to the lower depth. In addition, this study indicates the possibility of poultry manure application to enhance the physio-chemical properties of sandy loam soil of Chitwan.
Keywords: Leaching, Nutrient risk, Organic manure, Radish.
Pages: 21 – 31 | Full PDF Paper