References
- Goyal , S. and Huffaker , R.C. 1986 . The uptake of NO3‐, NO2‐, and NH4+ by intact wheat (Triticum aestivum) seedlings. I. Introduction and kinetics of transport systems . Plant Physiol. , 82 : 1051 – 1056 .
- Raper , C.D. Jr. , Vessey , J.K. , Henry , L.T. and Chaillou , S. 1991 . Cyclic variations in nitrogen uptake rate of soybean plants: Effects of pH and mixed nitrogen sources . Plant Physiol. Biochem. , 29 : 205 – 212 .
- Tolley‐Henry , L. , Raper , C.D. Jr. and Granato , T.C. 1988 . Cyclic Variations in nitrogen uptake of soybean plants: Effects of external nitrogen concentration . J. Exp. Bot. , 39 : 613 – 622 .
- Lim , J.T. , Wilkerson , G.G. , Raper , C.D. Jr. and Gold , H.J. 1990 . A dynamic growth model of vegetative soya bean plants: Model structure and behavior under varying root temperature and nitrogen concentration . J. Exp. Bot. , 41 : 229 – 241 .
- Cooper , H.D. and Clarkson , D.T. 1989 . Cycling of amino‐nitrogen and other nutrients between shoots and roots in cereals — A possible mechanism integrating shoot and root in the regulation of nutrient uptake . J. Exp. Bot. , 40 : 753 – 762 .
- Vessey , J.K. , Henry , L.T. , Chaillou , S. and Raper , C.D. Jr. 1990 . Root‐zone acidity affects relative uptake of nitrate and ammonium from mixed nitrogen sources . J. Plant Nutr. , 13 : 95 – 116 .
- Henry , L.T. and Raper , C.D. Jr. 1989 . Effects of root zone acidity on utilization of nitrate and ammonium in tobacco plants . J. Plant Nutr. , 12 : 811 – 826 .
- Macduff , J.H. , Hopper , M.J. and Wild , A. 1987 . The effect of root temperature on growth and uptake of ammonium and nitrate by Brassica napus L. cv. Bien venu in flowing solution culture. II. Uptake from solutions containing NH4NO3 . J. Exp. Bot. , 38 : 53 – 66 .
- Bloom , A.J. 1988 . Ammonium and nitrate as nitrogen sources for plant growth . ISI Atlas Sci. Animal Plant Sci. , 1 : 55 – 59 .
- Deane‐Drummond , C.E. and Glass , A.D.M. 1983 . Short term studies of nitrate uptake into barley plants using ion‐specific electrodes and 36C1O3‐ I. Control of net uptake by NO3‐ efflux . Plant Physiol. , 73 : 100 – 104 .
- Breteler , H. and Arnozis , P.A. 1985 . Effect of amino compounds on nitrate utilization by roots of dwarf bean . Phytochemistry , 24 : 653 – 657 .
- Rufty , T.W. Jr. , Jackson , W.A. and Raper , C.D. Jr. 1982 . Inhibition of nitrate assimilation in the presence of ammonium: The moderating influence of potassium . J. Exp. Bot. , 33 : 1122 – 1137 .
- Morgan , M.A. and Jackson , W.A. 1989 . Reciprocal ammonium transport into and out of plant roots: Modifications by plant nitrogen status and elevated root ammonium concentration . J. Exp. Bot. , 40 : 207 – 214 .
- Vessey , J.K. , York , E.K. , Tolley‐Henry , L. and Raper , C.D. Jr. 1988 . Uniformity of environmental conditions and plant growth in a hydroponic culture system for use in a growth room with aerial CO2 control . Biotronics , 17 : 79 – 94 .
- Sokal , R.R. and Rohlf , J.F. 1981 . Biometry: The Principles and Practice of Statistics in Biological Research. , 2nd edition , New York, NY : W.H. Freeman .
- Lee , R.B. , Purvis , J.V. , Ratciff , R.E. and Saker , L.R. 1992 . Nitrogen assimilation and the control of ammonium and nitrate absorption in maize roots . J. Exp. Bot. , 43 : 1385 – 1396 .