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By G. Aflakpui

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Breed. Sci. 60: 412–418. Conti1 (2004) A phylogenetic analysis of Apostasioideae (Orchidaceae) based on ITS, trnL-F and matK sequences. Plant Syst. Evol. 247: 203–213. J. (1995) Phylogeny of the Zingiberanae: morphology and molecules. ). 443–460. J. (1990) The phylogeny and classification of the Zingiberales. Ann. Missouri Bot. Gard. 77: 698–721. Echeverry (1993) Listapreliminar de las Heliconias de Colombia y cinco espécies nuevas. Caldasia. 17:183–197. Zimmer (2001) Unraveling the evolutionary radiation of the families of the Zingiberales using morphological and molecular evidence.

Am. J. Bot. 84: 1120–1136. Rajmohan (2006) Molecular characterization of Heliconia by RAPD assay. J. Tropi. Agric. 44: 37–41. Evans (2007) Monophyly and phylogenetic relationships in Lymania (Bromeliaceae: Bromelioideae) based on morphology and chloroplast dna sequences. Sys. Botany. 32: 264–270. Taylor (1990) Amplification and direct sequencing of fungal ribosomal RNA genes for phylogenetics. ). PCR Protocols: A Guide to methods and applications. Academic Press, San Diego, pp. 315–322. Section 2 Crop Production 3 Concepts in Crop Rotations H.

Libraries at all major agricultural universities have a seemingly endless supply of research articles and texts pointing out the importance of adequate N-fertility in the growth and development of every crop important to humankind. In organic crop farming, and increasingly in conventional cropping systems, the use of crop rotations that supply ample supplies of N to non-leguminous cereals is an important management strategy. Prior to the escalating energy prices and the increasing cost of manufactured N-fertilizer sources, the use of legumes that fix atmospheric N by Rhizobium-legume symbiosis, especially clover species, as green manures or cover crops had diminished sharply.

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