Mass balance of 15N applied to Kentucky bluegrass including direct measurement of denitrification

被引:37
作者
Horgan, BP
Branham, BE
Mulvaney, RL
机构
[1] Univ Minnesota, Dept Hort Sci, St Paul, MN 55108 USA
[2] Univ Illinois, Dept Nat Resources & Environm Sci, Urbana, IL 61801 USA
关键词
D O I
10.2135/cropsci2002.1595
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
Although the fate of fertilizer applied to turfgrass has been studied in the past, recovery of applied fertilizer N is typically low, and denitrification has been cited as the reason. The objectives of this research were twofold: (i) to examine the fate of IN applied to Kentucky bluegrass (Poa pratensis L.) turf as KNO3, including direct measurement of denitrification; and (ii) to determine whether and how plants affect fertilizer-N recovery. polyvinyl chloride (PVC) cylinders, modified to permit atmospheric sampling, were used throughout field experiments during the spring and summer 1999 and a greenhouse experiment in 2000. Potassium nitrate (98.5 atom,. IN) was applied in solution at 49 kg N ha(-1) to replicated plots, and atmospheric samples were collected three times a day from 0800 to 1100, 1100 to 1400, and 1400 to 1700 h during a 6-wk period in the spring and a 4-wk period during the summer of 1999. Emission of N-2 or N2O ranged from 3.3 to 21.3% and from 0.3 to 5.9% of labeled fertilizer N (LFN), respectively. Recovery of LFN in the soil or plant, plus that emitted as N-2 or N2O, ranged from 57.4 to 73.2%. A 4-wk greenhouse experiment comparing LFN recovery for bare soil and turf, including gas emission and leachate, was initiated in the summer of 2000. Total emission of LFN as N-2 or N2O was 19.0% for the turfgrass, as compared with 7.3% for the bare soil. Corresponding values for total recovery of LFN were 70.6 and 84.2%, respectively.
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页码:1595 / 1601
页数:7
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