Agriculture Reference
In-Depth Information
Unger, P. W., H. V. Eck, and J. T. Musick. 1981. Alleviating plant water stress, In:
Modifying the Root
Environment to Reduce Crop Stress
, eds., G. F. Arkin, and H. Taylor, pp. 61-96. St. Joseph, Michigan:
Am. Soc. Agric. Eng., St. Joseph, Michigan.
Unkovich, M. J., J. S. Pate, and P. Sanford. 1997. Nitrogen fixation by annual legumes in Australian
Mediterranean agriculture.
Aust. J. Agric. Res
. 48:267-293.
Van Kessel, C. and C. Hartley. 2000. Agricultural management of grain legumes: Has it led to an increase in
nitrogen fixation?
Field Crops Res
. 65:165-181.
Vessey, J. K., K. B. Walsh, and D. B. Layzell. 1988a. Oxygen limitation of N
2
fixation in stem-girdled and
nitrate-treated soybean
. Physiol. Plant
. 73:113-121.
Vessey, J. K., K. B. Walsh, and D. B. Layzell. 1988b. Can a limitation in phloem supply to nodules account for
the inhibitory effect of nitrate on nitrogenase activity in soybean:
Physiol. Plant
. 74:137-146.
Voisin, A., S., C. Salon, N. G. Munier-Jolain, and B. Ney. 2002. Effect of mineral nitrogen on nitrogen nutrition
and biomass partitioning between the shoot and roots of pea.
Plant Soil
242:251-262.
Vyn, T. J., K. L. Janovicek, M. H. Miller, and E. G. Beauchamp. 1999. Soil nitrate accumulation and corn
response to preceding small-grain fertilization and cover crops.
Agron. J
. 91:17-24.
Walley, F. L., G. W. Clayton, P. R. Miller, P. M. Carr, and G. P. Lafond. 2007. Nitrogen economy of pulse crop
production in the northern great plains.
Agron. J
. 99:1710-1718.
Wani, S. P., O. P. Rupela, and K. K. Lee. 1995. Sustainable agriculture in the semi-arid tropics through biologi-
cal nitrogen fixation in grain legumes.
Plant Soil
174:29-50.
Waterer, J. G. and J. K. Vessey. 1993. Effect of low static nitrate concentrations on mineral nitrogen uptake,
nodulation, and nitrogen fixation in field pea.
J. Pant Nutr
. 16:1775-1789.
Weisz, P. R. and T. R. Sinclair. 1988. Soybean nodule gas permeability, nitrogen fixation and diurnal cycles in
soil temperature.
Plant Soil
109:227-234.
Werner, D. 1987.
Plant and Microbial Symbiosis
. Stuttgart: Verlag.
Werner, D., J. Wilcockson, R. Tripf, E. Morschel, and H. Papen. 1981. Limitation of symbiotic and associ-
ated nitrogen fixation by developmental stages in the system
Rhizobium japonicum
with
Glycine max
and
Azospirillum brasilense
with grasses, e.g.
Triticum aestivum
. In:
Biology of Inorganic Nitrogen and
Sulfur
, eds., H. Bothe, and A. Trebst, pp. 299-308. New York: Springer-Verlag.
Wilson, P. W., E. B. Fred, and M. R. Salmon. 1933. Relation between carbon dioxide and elemental nitrogen
assimilation in leguminous plants.
Soil Sci
. 35:145-163.
Witty, J. F. 1979. Acetylene reduction assay can overestimate nitrogen fixation in soil.
Soil Biol. Biochem.
11:209-210.
Witty, J. F., R. J. Rennie, and C. A. Atkins. 1988.
15
N addition methods for assessing N
2
fixation under field
conditions. In:
World Crops: Cool Season Food Legumes
, ed., R. J. Summerfield, pp. 715-730. London:
Kluwer Academic Publishers.
Worrall, V. S. and R. J. Roughley. 1976. The effect of moisture stress on infection of
Trifolium subterraneum
L.
by
Rhizobium trifolii
.
J. Exp. Bot
. 27:1233-1241.
