1Kalyan Krishi Vigyan Kendra, Purulia, India
2Uttar Banga Krishi Viswavidyalaya, Cooch Behar, West Bengal, India
3Bidhan Chandra Krishi Viswavidyalaya, Mohanpur, Nadia, West Bengal, India
4Fertilizer Control Laboratory, Berhampore, Murshidabad, West Bengal, India
5Bahichard Bipin Siksha Niketan, Bahichard, Purba Mednipur, West Bengal, India
*Corresponding author: parimal_ssac@rediffmail.com
Online published on 21 January, 2017.
Organic matter is one of the sources of nitrogen in the soil. Nitrogen mineralization depends on application method, kind of organic matter, microbial activity, aeration and moisture. Soil samples were taken from Mathura tea garden and Uttar Banga Krishi Viswavidyalaya cultivated field, West Bengal. Nitrogen mineralization was studied on tea soil and cultivated soil. Seven organic matters were collected for this study. Vermicompost (VC), farm yard manure (FYM), poultry manure (PM) were decomposed, whereas, raw cow dung (RCD), fish meal (FM), tannery waste (TW) and mustard cake (MC) were undecomposed. The mean maximum and minimum soil temperature for the entire in situ incubation period were respectively 26.33°C and 16.03°C. Net mineralization data (mg N/kg soil) showed that over the period of 84 days it varied from 26.43 to 62.19 for VC, 7.77 to 31.09 for FYM, 36.86 to 72.62 for PM, 32.65 to 76.19 for RCD, 59.08 to 106.51 for FM, 76.96 to 119.72 for TW and 29.54 to 108.06 for MC. The average of the weekly mineralized nitrogen from organic matter was in the decreasing order of TW >FM>MC >PM>RCD>VC>FYM.
This study evaluated Net N mineralization from organic matter.
In situ N mineralization data exhibited that high nitrogen containing organics had higher net mineralized nitrogen as compared to other in both tea garden and cultivated field soil.
Organic matter, soil, N mineralization, FYM, soil temperature
