Controlled-release nitrogen in tree nurseries

摘要: Nitrogen management in nursery systems faces two challenges: improving seedling quality and reducing environmental impacts on adjacent ecosystems. Nursery is generally based the concept of “bigger seedlings are good seedlings.” Guidelines for have been developed size other physical features (Thompson Schultz, 1995; Dey Parker, 1997; Kormanik et al., 1998; Jacobs 2005). Seedling performance after outplanting suggests that soil under conditions luxury consumption will improve chemical seedling-quality (Timmer, 1997). Maintaining large plant-available nitrogen pools soils requires amounts fertilizer over a growing season because complexity cycle, sandy texture, intensive irrigation events typical tree systems. Thus, maintaining luxury-consumption with could generate excessive levels systems, which may lead to nitrate groundwater contamination. [introduction extract]