References
- Afre , J.L. and Blue , W.G. 1989 . Effects of ammonium and nitrate N on the availablity of applied P from a differentially limed Florida ultisol . Soil and Crop Sci. Soc. Fla. Proc. , 48 : 117 – 126 .
- Breteler , H. and Smit , A.L. 1974 . Effect of ammonium nutrition on uptake and metabolism of nitrate in wheat . Neth. J. Agric. Sci. , 22 : 73 – 81 .
- Cox , W.J. and Reisenauer , N.M. 1973 . Growth and ion uptake by wheat supplied nitrogen as nitrate, or ammonium, or both . Plant and Soil , 38 : 363 – 380 .
- Feil , B. , Thiraporn , R. and Stamp , P. 1993 . In vitro nitrate reductase activity of laboratory‐grown seedlings as an indirect selection criterion for maize . Crop Sci. , 33 : 1280 – 1286 .
- Gahoonia , T.S. , Claasen , N. and Jungk , A. 1992 . Mobilization of phosphate in different soils by ryegrass supplied with ammonium or nitrate . Plant Soil , 140 : 241 – 248 .
- Gashaw , L. and Mugwira , L.M. 1981 . Ammonium‐N and nitrate‐N effects on the growth and mineral compositions of triticale, wheat and rye . Agron. J. , 73 : 47 – 51 .
- Gentry , L.E. , Wang , X.T. and Below , F.E. 1989 . Nutrient uptake by wheat seedlings that differ in response to mixed nitrogen nutrition . J. Plant Nutr. , 12 : 363 – 373 .
- Leidi , E.O. , Silberbush , M. and Lips , S.H. 1991 . Wheat growth as affected by nitrogen type, pH and salinity I. Biomass production and mineral composition . J. Plant Nutr. , 14 : 235 – 246 .
- Marschner , H. 1991 . “ Root‐induced changes in the availability of micronutrients in the rhizosphere ” . In Plant Roots. The Hidden Half , Edited by: Waisel , Y. , Eshel , A. and Kafkafi , U. 503 – 528 . New York, NY : Marcel Dekker Inc. .
- Marschner , H. and Romheld , V. 1983 . In vivo measurements of root induced pH changes at the soil‐root interface: Effect of plant species and nitrogen source . Z. Pflanzenphysiol. , 111 : 241 – 251 .
- Riley , D. and Barber , S.A. 1971 . Effect of ammonium and nitrate fertilization on phosphorus uptake as related to root‐induced pH changes at the root‐soil interface . Soil Sci. Soc. Amer. Proc. , 35 : 301 – 306 .
- Schortemeyer , M. , Feil , B. and Stamp , P. 1993 . Root morphology and nitrogen uptake of maize simultaneously supplied with ammonium and nitrate in a split‐root system . Ann. Bot. , 72 : 107 – 115 .
- Schnug , E. and Finck , A. 1981 . Einfluss unterschiedlicher Stickstoffdungungs‐formen auf die Mobilisierung von Spurennahrstoffen . Landwirtsch. Forsch. Sonderh. , 37 : 243 – 253 .
- Wang , X. and Below , F.E. 1992 . Root growth, nitrogen uptake, and tillering of wheat induced by mixed‐nitrogen source . Crop Sci. , 32 : 997 – 1002 .