Nitrate leaching, nitrous oxide emission and N use efficiency of aerobic rice under different N application strategy. Issue 4 (21st March 2018)

• Record Type: Journal Article
• Authors: Mohanty, Sangita; Swain, C. K.; Tripathi, Rahul; Sethi, S. K.; Bhattacharyya, P.; Kumar, Anjani; Raja, R.; Shahid, Mohammad; Panda, B. B.; Lal, B.; Gautam, Priyanka; Munda, Sushmita; Nayak, A. K.
• Is Part Of: Archives of agronomy and soil science. Volume 64:Issue 4(2018)
• Page Start: 465
• Page End: 479
• Publication Date: 2018-03-21
• Subjects: NO3 leaching -- N2O emission -- nitrogen use efficiency -- aerobic rice -- leaf colour chart; Horticulture -- Periodicals; Soils -- Periodicals; 630.5
• DOI: 10.1080/03650340.2017.1359414
• Languages: English
• ISSNs: 0365-0340

Abstract

ABSTRACT: A field study was conducted in the sub-humid tropical region of India to examine the effect of different nitrogen (N) management strategies on nitrate leaching, nitrous oxide (N2 O) emission and N use efficiency in aerobic rice. Treatments were: control (no N), 120 kg N ha −1 applied as prilled urea (PU) in conventional method, 120 kg N ha −1 applied as neem coated urea (NCU) in conventional method, N applied as PU on the basis of leaf colour chart (LCC) reading, N applied as NCU on the basis of LCC reading, and 120 kg N ha −1 applied as PU and farm yard manure (FYM) in 1:1 ratio. Results showed that 3.4–16.1 kg NO3 -N ha −1 was leached below 45 cm depth and 0.61–1.12 kg N2 O-N ha −1 was emitted from aerobic rice during the growing season. NCU when applied conventionally reduced nitrate-nitrogen (NO3 -N) leaching and N2 O emission by 18.6% and 21.4%, respectively However when applied on the basis of LCC reading NCU reduced NO3 -N leaching by 39.8% as compared to PU applied in conventional method. NCU when applied on the basis of LCC reading synchronized N supply with demand and reduced N loss, which resulted in higher yield and N use efficiency.