Results 211 to 220 of about 252,499 (262)

EFFECT OF NITROGEN AVAILABILITY ON GROWTH AND NITROGEN UPTAKE IN LETTUCE

Acta Horticulturae, 2000
Fresh and dry matter production and nitrogen uptake during crop growth of two lettuce (Lactuca sativa L.) cultivars, cv. Audran (butterhead lettuce) and cv. Canasta (loose leaf lettuce), were studied in a field trial at different levels of fertilizer-N (0, 50, 100 and 200 kg N ha-1) broadcast at transplanting. On a dry matter basis, the relative growth
TEI, Francesco, BENINCASA, Paolo, GUIDUCCI, Marcello   +2 more
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Organic and inorganic nitrogen uptake in lichens

Planta, 2004
In order to learn more about nitrogen (N) acquisition in lichens, and to see whether different lichens differ in their affinity to various N sources, N uptake was measured in 14 various lichen associations ("species"). These species represented various morphologies (fruticose or foliose), contrasting microhabitat preferences (epiphytic or terricolous),
Lena, Dahlman, Jörgen, Persson, Kristin, Palmqvist, Torgny, Näsholm   +3 more
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Dissolved organic nitrogen uptake by seagrasses

Limnology and Oceanography, 2008
We examined the ability of seagrasses to take up dissolved organic nitrogen (DON) with leaves (in situ) and roots (laboratory) in an oligotrophic tropical offshore meadow in Indonesia using 15N‐labeled nitrogen (N) substrates. We compared the uptake of urea and amino acids with that of ammonium (NH4+) and nitrate (NO3−) and determined uptake kinetics ...
Vonk, J.A., Middelburg, J.J., Stapel, J., Bouma, T.J.   +3 more
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Nitrogen Uptake, Dissolved Organic Nitrogen Release, and New Production

Science, 1994
In oceanic, coastal, and estuarine environments, an average of 25 to 41 percent of the dissolved inorganic nitrogen (NH 4 + and NO 3 – ) taken up by phytoplankton is released as dissolved organic nitrogen (DON).
D A, Bronk, P M, Glibert, B B, Ward
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Nitrogen uptake and translocation by Chara

Aquatic Botany, 2003
Abstract The potential for above-ground and below-ground uptake and subsequent internal translocation of ammonium (NH4+) and nitrate (NO3−) by the macroalga Chara spp. was investigated. In a two compartment experimental set-up separating above-ground and below-ground algal parts, the charophytes were exposed to various combinations of 15 N
Vermeer, C.P., Escher, M., Portielje, R., de Klein, J.J.M.   +3 more
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Nitrogen (N) Uptake

2015
Globally indigenous nitrogen in soil cannot meet the crop requirement at contemporary production levels. Synthetic nitrogenous fertilisers along with other nutrients have to be applied to sustain existing production and, in many countries, further increase crop production commensurate with their population growth.
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Nitrogen uptake by tropical orchids

Environmental and Experimental Botany, 1993
Abstract The uptake of nitrate and ammonium by two terrestrial orchids ( Bromheadia finlaysonia and Cymbidium sinense ) and an epiphytic orchid ( Dendrobium “White Fairy”) in solution culture was studied. The rates of uptake of nitrate and ammonium were linear, with a higher uptake rate for ammonium. The rates of nitrate uptake for Cymbidium and
Hew, C.S., Lim, L.Y., Low, C.M.
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Efficiency of nitrogen uptake by potatoes

American Potato Journal, 1983
White Rose potatoes were fertilized with isotopically labeled ammonium sulfate at rates of 67, 134, 202 and 270 kg N/ha to evaluate N uptake efficiency. All N application increased yields above the control, however the 3 higher N rates produced the same yields statistically.
K. B. Tyler, F. E. Broadbent, J. C. Bishop   +2 more
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Arbuscular mycorrhizal fungi and nitrogen uptake

Archives of Microbiology, 2010
Nitrogen (N) is among the most important macro-nutrients significantly affecting plant growth and yield production. Accordingly, N must be supplied adequately so that optimum amounts of yield are resulted. There are different ways of supplying N to the plant including the use of chemical and biological fertilization.
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Nitrogen uptake and nitrification in the Changjiang estuary

Marine Environmental Research
Anthropogenic activities have collectively resulted in high loads of nutrients exported into the estuaries, significantly affecting the nitrogen (N) cycling. Yet nitrification and N uptake, the central processes of the N cycle, have rarely been reported simultaneously in the estuaries. Here we report on pelagic nitrification and uptake rates of ammonia
Xing, Hou, Chongcong, Liu, Guodong, Song, Jinglong, Mu, Wen, Liang, Haoming, Xu, Nian, Wu, Wenqi, Xu, Su Mei, Liu   +8 more
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