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And sunn hemp (Crotalaria juncea L) can effectively scavenge nutrients from deep soil layers and render them more readily available for subsequent crops (Wang et al. 2006; Fageria et al. 2005; Calegari 2003; Sullivan 2003). Fast-growing and deep-rooting cover crops such as winter rye, radish, and brassicas, deplete labile residual N pools and are very effective in retaining nutrients (Vidal and Lopez 2005; Isse et al. 1999; Dabney et al. 2001; Wyland et al. 1996). In Maryland, brassicas depleted residual soil N up to a soil depth of 180 cm and took up more N compared to rye (Weil and Kremen 2007).
Although it requires special equipment, undersowing of a cover crop in an existing crop may be desirable, since it facilitates more efficient resource use while reducing potential nutrient losses and erosion risks (Hartwig and Ammon 2002; Sullivan 2003). S. Scholberg et al. when it is too hot to grow commercial crops as is the case in Florida (Avila 2006). In the case of more complex arable cropping systems, the use of software tools to explore such options to generate viable alternatives greatly facilitates the design process (Bachinger and Zander 2007; Dogliotti et al.
2003), may facilitate the first selection step of designing suitable cover crops. 1 Adaptation Adaptation may include day length, temperature, radiation, rainfall, soil, pests, and crop duration aspects. Cover crops can be grouped as being adapted to “cold/temperate” versus “warm/tropical” growth environments (Anderson et al. 2001). The first type may survive a freeze upto −10°C while their growth may be hampered under hot conditions (>25–30°C). Leguminous species within this group include Lupinus, Trifolium, and Vicia species and they grow well in temperate climates, during the winter season in subtropical climates, or in the tropical highlands (Cherr et al.