Intermediate wheatgrass (Thinopyrum intermedium; IWG) is a perennial grass under development as grain and forage crop. Although IWG known for its ability to take up nitrate improve water quality, seasonal nitrogen (N) demand uptake by not well known. We measured shoot, root, production, tissue N concentration, soil mineral at multiple plant growth stages in 1- 2-year-old stands fertilized with ...

eight forage sorghum cultivars (sweet jumbo, nectar, chopper, pacific bmr, speed feed, kfs1, kfs2 and kfs3) were assessed to determine the most suitable traits carrying cultivar, through a randomized complete block design with four replications during 2003-2005. ammonium phosphate (basd on p2o5) was applied at 115 kg/ha and 183 kg/ha of nitrogen (urea-based) at four application times. six trait...

Current biofuel feedstock crops such as corn lead to large environmental losses of N through nitrate leaching and NO emissions; second-generation cellulosic crops have the potential to reduce these N losses. We measured N losses and cycling in establishing miscanthus (), switchgrass ( L. fertilized with 56 kg N ha yr), and mixed prairie, along with a corn ( L.)-corn-soybean [ (L.) Merr.] rotati...

abstract- crop residue is applied to amend soil properties and increase crop yield. in this study, the effects of rapeseed residues and different rates of nitrogen on grain yield and yield components of sunflower and weed dry matter were investigated. the experiment was conducted at the experimental farm of college of agriculture, shiraz university, located at badjgah, shiraz, iran in 2007-2008...

Ecologists have long treated temperate forests as systems limited by nitrogen (N) availability. Widespread concern about the effects of anthropogenic N on forested ecosystems has inspired experimental simulation of the effects of chronic N addition. This study investigates the effects of 8 years (1996–2003) of simulated chronic N deposition on tree growth and mortality in an upland mixed-oak fo...

Although feed intake and efficiency differences in growing cattle of low and high residual feed intake (RFI) classification have been established, little is known about the difference in grazed forage intake between beef cows of known RFI classification. Two experiments were conducted using Hereford cows for which RFI had been determined as heifers using the GrowSafe 4000E feed intake system, a...

J. Nat. Resour. Life Sci. Educ. 39:125–131 (2010). doi:10.4195/jnrlse.2009.0021 • http://www.JNRLSE.org © American Society of Agronomy 5585 Guilford Road, Madison, WI 53711 USA ABSTRACT Opportunities for farmers to participate in greenhouse gas (GHG) credit markets require that growers, students, extension educators, offset aggregators, and other stakeholders understand the impact of agricultur...

Nitrogen (N) is the most limiting nutrient for maize, and appropriate N fertilization can promote maize growth yield. The effect of fertilizer rates timings on morphology, antioxidant enzymes, grain yield (Zea mays L.) in Loess Plateau China was evaluated. four levels, i.e., 0 (N0), 100 (N1), 200 (N2), 300 (N3) kg ha?1, were applied at two (T1, one-third sowing two-thirds six-leaf stage maize; ...

introduction sunflower (helianthus annuus l.) is one of the most important oil crops in the world. iran is climatically regarded as an arid and semi-arid region in the world, where the lack of precipitation and its inappropriate distribution, high temperature and extensive evaporation makes the irrigation the main way for meeting plants water demand. hence, studying the effect of irrigation on ...