Nitrogen removal in switchgrass biomass under two harvest systems

被引:82
作者
Reynolds, JH [1 ]
Walker, CL [1 ]
Kirchner, MJ [1 ]
机构
[1] Univ Tennessee, Dept Plant & Soil Sci, Knoxville, TN 37901 USA
关键词
Panicum virgatum L; herbaceous energy crops; biofuels; nitrogen use;
D O I
10.1016/S0961-9534(00)00042-8
中图分类号
S2 [农业工程];
学科分类号
0828 ;
摘要
Information is lacking on the nitrogen content of switchgrass (Panicum virgatum L.) biomass from different genotypes and management systems. Nitrogen removed in the biomass would be important in determining fertilization practices and biological degradation. Six switchgrass entries were grown for biomass yield under two harvest systems, one-cut: cut once near the end of October, and two-cut: cut in early summer and near the end of October. Dry matter yield, N concentration, and N content of biomass were determined for five years. More N was usually removed in the two-cut system than in the one-cut system. Nitrogen removed in the biomass exceeded N applied under the two- cut system in all years except one year with a severe summer drought. In the one-cut system N removed was less than applied in all years except when no N was applied in the last year. Nitrogen concentration was higher in the summer harvest than the fall harvest of the two-cut system. Nitrogen concentration in the fall harvest was lower for the one-cut than the two-cut system. Differences in N removed between harvest systems reflected the low N concentration of the fall harvest of the one-cut system and the higher N concentration in the summer harvest of the two-cut system. (C) 2000 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:281 / 286
页数:6
相关论文
共 16 条
[1]   A review of carbon and nitrogen balances in switchgrass grown for energy [J].
Bransby, DI ;
McLaughlin, SB ;
Parrish, DJ .
BIOMASS & BIOENERGY, 1998, 14 (04) :379-384
[2]   BIOMASS PRODUCTION FROM SELECTED HERBACEOUS SPECIES IN THE SOUTHEASTERN USA [J].
BRANSBY, DI ;
WARD, CY ;
ROSE, PA ;
SLADDEN, SE ;
KEE, DD .
BIOMASS, 1989, 20 (3-4) :187-197
[3]   Evaluation of switchgrass rhizosphere microflora for enhancing seedling yield and nutrient uptake [J].
Brejda, JJ ;
Moser, LE ;
Vogel, KP .
AGRONOMY JOURNAL, 1998, 90 (06) :753-758
[4]  
COLLINS M, 1994, ORNLSUB88SC617
[5]   Effect of irrigation and nitrogen fertilization on biomass yield and efficiency of energy use in crop production of Miscanthus [J].
Ercoli, L ;
Mariotti, M ;
Masoni, A ;
Bonari, E .
FIELD CROPS RESEARCH, 1999, 63 (01) :3-11
[6]   Cultivation of Miscanthus under west European conditions: Seasonal changes in dry matter production, nutrient uptake and remobilization [J].
Himken, M ;
Lammel, J ;
Neukirchen, D ;
CzypionkaKrause, U ;
Olfs, HW .
PLANT AND SOIL, 1997, 189 (01) :117-126
[7]  
PARRISH DJ, 1999, SWITCHGRASS BIOFUELS
[8]  
*SAS I, 1985, SAS STAT GUID PERS C
[9]  
SLADDEN SE, 1994, P FORAG GR, V3, P242
[10]   BIOMASS YIELD, COMPOSITION AND PRODUCTION COSTS FOR 8 SWITCHGRASS VARIETIES IN ALABAMA [J].
SLADDEN, SE ;
BRANSBY, DI ;
AIKEN, GE .
BIOMASS & BIOENERGY, 1991, 1 (02) :119-122