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Frank G. Bethea Jr., Dara Park, Andrew Mount, Nick Menchyk, and Haibo Liu

. transvaalensis Burtt Davy cv. TifEagle] putting greens applied with foliar urea applications, providing evidence of lower environmental impact by foliar fertilization ( Stiegler et al., 2011 ). Nitrogen absorption with various N sources and factors affecting

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Cheng Bai, Charles C. Reilly, and Bruce W. Wood

role for Ni became evident with the discovery that urease (EC 3.5.1.5, urea amidohydrolase), a ubiquitous enzyme in plant organs, requires Ni for activation ( Dixon et al., 1975 ). Subsequent research by Brown et al. (1987a , 1987b) found that Ni met

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Sameh Sassi-Aydi, Samir Aydi, and Chedly Abdelly

to the nutrient solution of only the symbiotic N-fixing plants. During the first 2 weeks, i.e., before nodule function, the nutrient solution was supplemented with 2 m m urea ( Ribet and Drevon, 1996 ). For urea-fed plants, 2 m m urea was added to

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M. Lenny Wells

management, pecan tree response to N has been variable in multiple studies throughout the years ( Hunter and Lewis, 1942 ; Smith et al., 1985 ; Storey et al., 1986 ; Worley, 1974 , 1990 ). Ammonium nitrate and urea are the most common forms of dry N

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Isaac T. Mertz, Nick E. Christians, and Adam W. Thoms

Antcliff, 1966 ; Mäkelä et al., 1996 ). Furthermore, compared with industry standard urea N, which must be converted to ammonium (NH 4 + ) by the enzyme urease before the N entering plant leaves and being assimilated into AA inside the plant ( Hull et al

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Letizia Tozzini, Paolo Sabbatini, and G. Stanley Howell

sprayed with a urea solution (1% w/v) using a backpack sprayer to the whole vine canopy until runoff, whereas control vines (CN) were left unsprayed. Direct spraying of the clusters was avoided. Because number of leaves and, consequently, leaf area were

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Carolyn F. Scagel, Richard P. Regan, and Guihong Bi

rate of N application to soil ( Bi et al., 2003 ; Cheng et al., 2001 ) and foliar sprays in the autumn with urea, are used to increase N reserves and improve growth during the following growing season ( Bi et al., 2005 ; Guak and Fuchigami, 2002

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Qiang Liu and Yiwei Jiang

) water (W); 2) 10 m m urea (N10); 3) 20 m m urea (N20); 4) 15 µ m cytokinin (transzeatin riboside, ZR) (CK); 5) 10 m m urea + 15 µ m cytokinin (N10CK); and 6) 20 m m urea + 15 µ m cytokinin (N20CK). Pots were sprayed with 10 mL of solutions at each

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Christian M. Baldwin, A. Douglas Brede, and Jami J. Mayer

15N–6.6P–12.5K fertilizer, an additional 15 lb/acre was applied using urea and AMS. Both dicamba and the N sources were applied alone or tank mixed with glyphosate at 0, 0.26, and 0.52 lb/acre. All treatments were applied on 3 Sept. 2010 and 2 Aug

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Luther C. Carson and Monica Ozores-Hampton

ammonium (NH 4 + ) to nitrate (NO 3 − ) by bacteria or to slow the enzymatic transformation of urea to NH 4 + ( Trenkel, 1997 ). Controlled-release fertilizers, the last subgroup of EEFs, are urea, ammonium nitrate, potassium nitrate, or other soluble