Plant-Based Biogas Production for Improved Nutrient Management ...

More documents

Recommendations

Info

4 Results and discussion 73 4.1 Growth promotion and N use efficiency of plant-based digestate 73 4.1.1 N uptake in the pot experiment 73 4.1.2 N uptake efficiency in the pot experiment (ryegrass) and field experiments (beetroot) 76 4.1.3 N utilisation efficiency in the field experiments (beetroot) 77 4.2 Residual N effects of harvested ley and green manure ley 77 4.3 Optimum nutrient supply to beetroot 83 4.4 System N effects 84 4.5 Conclusions and answers to the hypotheses 86 5 Final remarks, practical implications and future perspectives 89 5.1 Biogas systems for organic farming 89 5.2 Future work 90 Acknowledgements 93 References 94
List of Publications This thesis is based on the work contained in the following papers, referred to by Roman numerals in the text: I Gunnarsson, A., Bengtsson, F. & Caspersen, S. (2010). Use efficiency of nitrogen from biodigested plant material by ryegrass. Journal of Plant Nutrition and Soil Science 173, 113-119. II Gunnarsson, A., Lindén, B. & Gertsson, U. (2008). Residual nitrogen effects in organically cultivated beetroot following a harvested/green manured grass-clover ley. Journal of Plant Nutrition 31, 1355–1381. III Gunnarsson, A., Lindén, B., and Gertsson U. 2011. Biodigestion of plant material can improve nitrogen use efficiency in a red beet crop sequence. HortScience 46(5), 765-775. IV Gunnarsson, A., Asp, H., and Gertsson U., Growth-limiting nutrients in beetroot fertilized with biodigested plant material. In manuscript. Papers I-III are reproduced with the permission of the publishers. 7
Page 1 and 2: Plant-Based Biogas Production for I
Page 3 and 4: Plant-Based Biogas Production for I
Page 5: Contents List of Publications 7 Abb
Page 9 and 10: Abbreviations and Synonyms BG Bioga
Page 11 and 12: 1 Introduction and theoretical fram
Page 13 and 14: after mulching (Larsson, 1997). Thi
Page 15 and 16: Table 1. Management practices and t
Page 17 and 18: ather than from crop residues (Nico
Page 19 and 20: N uptake, % of added N 60 50 40 30
Page 21 and 22: (1998) studied residual effects in
Page 23 and 24: N fertilisation and/or with a low N
Page 25 and 26: Figure 3. Conversion steps in anaer
Page 27 and 28: chapter 2) but 0.26 m 3 CH 4 (kg VS
Page 29 and 30: 1.4 Fertiliser effect of organic wa
Page 31 and 32: VFA level was more than 10 times la
Page 33 and 34: Table 4. Characteristics of digesta
Page 35 and 36: entering the digester, thus not ana
Page 37 and 38: Household waste digestate (Table 5)
Page 39 and 40: other short-chain fatty acids. The
Page 41 and 42: As the fertiliser dose was based on
Page 43 and 44: with supply of 2-4 times as much to
Page 45 and 46: vetch), N 2 fixation was 5 kg N ha
Page 47 and 48: climate change, acidification, eutr
Page 49 and 50: (2003) showed increasing NH 4 -N/to
Page 51 and 52: - beetroot juice can be explained b
Page 53 and 54: tissue, with the latter increasing
Page 55: ow-centred log ratios for all nutri
Page 58 and 59:
experiments together with other res
Page 60 and 61:
the plant pieces in the silage was
Page 62 and 63:
Table 7. Volatile fatty acids (VFA)
Page 64 and 65:
3.3 Field experiment (Papers II-IV)
Page 66 and 67:
nutrient status of nutrients other
Page 68 and 69:
68 Table 9. Supply of NH -N with ef
Page 70 and 71:
↑ Beetroot plant ready to be put
Page 73 and 74:
4 Results and discussion The system
Page 75 and 76:
first cut; (iii) immobilisation in
Page 77 and 78:
In contrast to the low NUE min in 3
Page 79 and 80:
Biomass, early growth (kg DM ha -1
Page 81 and 82:
harvested ley, as mentioned in sect
Page 83 and 84:
4.3 Optimum nutrient supply to beet
Page 85 and 86:
sequence B could have been caused b
Page 87 and 88:
short-term effect (6 weeks) was les
Page 89 and 90:
5 Final remarks, practical implicat
Page 91:
time for storage after the main bio
Page 95 and 96:
References Aitchison, J. (2003). Th
Page 97 and 98:
Crews, T.E. & Peoples, M.B. (2005).
Page 99 and 100:
Greenwood, D.J. & Stone, D.A. (1998
Page 101 and 102:
RPZI (Reference Population Zero Ind
Page 103 and 104:
Möller, K. & Stinner, W. (2009). E
Page 105 and 106:
Strohmeyer, K. (2010b). The develop
Page 107:
Webb, A.J., Patel, N., Loukogeorgak
show all

Plant-Based Biogas Production for Improved Nutrient Management ...

Create successful ePaper yourself

Delete template?

Save as template?