Manpreet S. Mavi B. S. Sekhon Jagdeep Singh O. P. Choudhary


An understanding of the mineralization process of organic amendments in soil is required to synchronize N release with crop demand and protect the environment from excess N accumulation. Therefore, we conducted a laboratory incubation experiment to assess nitrogen mineralization potential of crop residues (rice and wheat straw) and organic manures (poultry manure, farmyard manure, cowpea and sesbania) in two benchmark soils (Typic Haplustept and Typic Ustifluvents) of semi-arid region of Punjab, India, varying in textureat field capacity moisture level at a constant temperature of 331°C. Mineralization was faster during first 7 days of incubation in Typic Haplustept and upto 14 days in Typic Ustifluvents which subsequently declined over time. In both soils, net N mineralization continued to increase with increasing period of incubation (expect with crop residues) and was significantly higher in Typic Ustifluvents (54-231µg g-1) than Typic Haplustept (33-203 µg g-1). Compared to unamended soils, percent N mineralized was highest is sesbania (35-40 %) followed by cowpea (32-37 %) and least in wheat (10-11 %) after 42 days of incubation. Thus, sesbania and cowpea may preferably be used to meetthe large N demand during early period of plant growth. Further, mineralization rate constants (k) also indicated that availability of mineral N was significantly higher with application of organic amendments than unamended control treatments in both soils. Therefore, it may be concluded that considerable economy in the use of inorganic N fertilizer can be employed if N mineralization potential of organic inputs is taken into consideration.




Crop residues, Organic manures, Mineralization, Kinetics, Soil texture

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Nitrogen release kinetics of organic nutrient sources in two benchmark soils of Indo-Gangetic plains. (2017). Journal of Applied and Natural Science, 9(2), 1123-1128. https://doi.org/10.31018/jans.v9i2.1333
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Nitrogen release kinetics of organic nutrient sources in two benchmark soils of Indo-Gangetic plains. (2017). Journal of Applied and Natural Science, 9(2), 1123-1128. https://doi.org/10.31018/jans.v9i2.1333

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