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| Ecological Agricultural Projects. | Intercropping. | http:/ / eap.mcgill.ca/ CSI_1.htm |
| MSU. | Legume green manures: A potential substitute for fertilizer in maize. | http:/ / fadr.msu.ru/ rodale/ agsieve/ txt/ vol3/ 3/ a6.html |
| Penn State. | Soil tillage management. | http:/ / agguide.agronomy.psu.edu/ cm/ sec1/ sec11g.cfm |
| New Agriculturist Online. | Sunnhemp: fertilizer, fodder, and fibre. | http:/ / www.new-agri.co.uk/ 99-4/ focuson/ focuson6.html |
| Annamalai University. | Sustaining agriculture through green manuring. | http:/ / www.hindu.com/ seta/ 2004/ 02/ 05/ stories/ 2004020500421700.htm |
| Mettot, B. | The inter planting of vegetables. Back Home Woods Magazine. | http:/ / www.backwoodshome.com/ articles2/ mettot81.html |
| DEEDI. | Trap cropping. | http:/ / www2.dpi.qld.gov.au/ cropresearch/ 14909.html |
| Intercrop. | What is intercropping? | http:/ / www.intercrop.dk/ General.htm |
| FAO. | Zero tillage: when less means more. | http:/ / www.fao.org/ ag/ magazine/ 0101sp1.htm |
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