Effect of pine needles on inorganic nitrogen pools of soil treated with fertilizers and manure under cabbage crop Rai Arvind K.1,*, Bhardwaj Rakesh2, Sureja Amish K.3, Bhattacharyya D.4 College of Horticulture and Forestry, Central Agricultural University, Pasighat, Arunachal Pradesh 791 102, India Present Address: 1Indian Grassland and Fodder Research Institute, Jhansi-284 003, Uttar Pradesh, India
2National Bureau of Plant Genetic Resources, New Delhi-110 012, India
3Indian Agricultural Research Institute, New Delhi – 110 012, India
4Assam Agricultural University, Jorhat, Assam, India
*Corresponding author e-mail: rai_arvindkumar@rediffmail.com
Abbreviations NH4+-N | = | ammonical nitrogen |
TDIN | = | total dissolved inorganic nitrogen |
TEIN | = | total extractable inorganic nitrogen |
USDA | = | United States Department of Agriculture. |
Online published on 14 February, 2012. Abstract Effect of pine needles application on the inorganic nitrogen pools of soil amended with organic and inorganic sources of nutrients was studied in a pot culture experiment using sandy loam soil. Fertilizers NPK (recommended NPK @68:33:33 mg kg−1 soil) and three sources of manures viz. green manure (Sesbania aculeata), farm yard manure (FYM) and vermicompost were applied alone or in combination with pine leaves (9 g kg−1 soil). There was a significant increase in total nitrogen of the soil due to application of manure and pine leaves. Application of different level of green manure, farm yard manure and vermicompost caused 5.4–7.0, 6.7–8.7 and 5.4–12.0 mg kg−1 increase in total extractable inorganic nitrogen (TEIN) and 2.6–4.2, 2.1–5.3 and 2.3–3.0 mg kg−1 increase in total dissolved inorganic nitrogen (TDIN), respectively. Amount of water and 0.5 M K SO extractable NH + and NO −- N2443 was reduced due to application of pine leaves along with green manure, FYM and vermicompost, whereas, with inorganic fertilizers the amount of 0.5 M K2SO4 extractable NH4+ (0.43 mg kg−1) and NO3−(0.47 mg kg−1) and water extractable NO3− (0.64 mg kg−1) - N at 90 days after application was increased. Top Keywords FYM, Green manure, Nitrogen availability, Pine needles, Soil extractable nitrogen, Vermicompost. Top |