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| COLOMB, B.; GLANDIERES, A.; CARPY-GOULARD, F.; LECAT, N.; PELLETIER, A.; PRIEUR, L.. |
| This study reveals a wide variability in the major parameters of the energy analysis applied to 44 four-year-long organic crop sequences. The intensification level of the systems in terms of the use or nonuse of organic fertilisation on cereals and of irrigation on summer crops (mainly pulses) is largely responsible for this variability. Average energy consumption ranges from 5 000 to 12 270 MJ/ha/year depending on the intensification level. Energy production varies from 35 500 to 43 950 MJ/ha/year. Since energy consumption and production both vary in the same direction with the degree of intensification, the energy gain is stable at an average value of 29300 MJ/ha/year. Energy efficiency decreases from 7.1 MJ/MJ for unfertilised and unirrigated crop... |
| Tipo: Journal paper |
Palavras-chave: Farming Systems. |
| Ano: 2009 |
URL: http://orgprints.org/15454/1/24%2DColomb.pdf |
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| JUSTES, J.; BEDOUSSAC, L.; PRIEUR, L.. |
| The objective of our work was to investigate innovative sustainable cropping systems to produce regular yields of wheat with a satisfactory grain protein concentration in organic farming systems. Achieving good production levels in stockless French organic farming systems is a major challenge due to strong N limitation. Our approach is mainly based on a better valorisation of the natural nitrogen resources from soil mineralisation and symbiotic fixation of legumes, and not by an increase in the use of organic fertiliser. Two experiments were carried out in southwestern France where winter wheat and durum wheat were grown for their use in human consumption (bread and pasta, respectively). On one hand, cover crops were sown in summer and were incorporated in... |
| Tipo: Journal paper |
Palavras-chave: Cereals; Pulses and oilseeds Crop combinations and interactions Composting and manuring. |
| Ano: 2009 |
URL: http://orgprints.org/15483/1/23%2DJustes.pdf |
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