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germination and growth when managed effectively ( Weston, 1996 ). Cheema et al. (2013) found that allelopathy in PM inhibited summer weeds but also the succeeding wheat ( Triticum aestivum) yield. Moreover, the same cover crop species will not perform

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) determined mealy blue sage to have the highest germination percent between 25 and 28 °C with germination reaching in excess of 96%. Allelopathy, however, has been observed in several species of Salvia . Baskin and Baskin (1998) reported bare zones 1 to 2 m

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, allelopathy, and attraction of symbionts and pollinators. The third chapter is “Regulation of Metabolite Synthesis in Plants,” which adds mechanisms that regulate the expression of genes and enzymes that synthesize phytochemicals. This chapter helps in the

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where rye was present as a result of competition or allelopathy. Table 4. Effects of production system and irrigation on weeds, Apr. 2010. Although dandelion was successfully suppressed with spring applications of glyphosate in both cropping systems in

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resistance, insect resistance, allelopathy, and endophyte infection). Selection likelihood of trait clusters differed between breeders and distributors ( Table 3 ). Breeders ranked the growth characteristics the highest, followed by abiotic stress resistance

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clover residues also may have inhibited weed development ( Liebman and Mohler, 2001 ; Weston, 1996 ), though allelopathy was not measured directly in this study. Fig. 1. Mean (± se ) weed percent coverage at three sampling dates in 2009 and one sampling

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exudates in rhizosphere soils of tobacco and sunflower Environ. Toxicol. 21 5 479 488 Chou, C.H. Zeng, R.S. 2010 Role of allelopathy in sustainable agriculture: Use of allelochemicals as naturally occurring bio-agrochemicals Allelopathy J. 25 1 3 16 Cong, R

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are reduced nitrogen availability ( Billeaud and Zajicek, 1989 ), water repellency ( Gartner, 1978 ), and allelopathy ( Duryea et al., 1999 ; Still et al., 1976 ). One question that is often asked by landscapers is whether fertilizers should be

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suppress weeds by either reducing resource availability ( Ngouajio and Mennan, 2005 ) or by inhibiting weed growth via allelopathy ( Reberg-Horton et al., 2005 ). Access to light, nutrients, water, and soil as affected by CC may affect weed persistence

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weed density and weed seedling emergence, particularly for summer annual weeds that are responsive to temperature and light, by direct competition from cover crop biomass ( Mennan et al., 2009 ; Teasdale, 1996 ) or by allelopathy ( Barnes and Putnam

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