Summary
Perennial ryegrass was grown in flowing solution culture with nitrogen supplied in amounts that increased exponentially,i.e. in parallel with the rate of increase in growth. Nitrogen was supplied as either NO −3 or NH +4 , and the amounts to be added were calculated on the basis of extrapolated values for dry weights obtained from fitted curves. There were two rates of addition for each form of N aimed at providing adequate (5.0 per cent) and less than adequate (2.75 per cent) contents in the plants in each case. Measured plant weights and N concentrations were in close agreement with predicted values over a four week experimental period. There was no effect of N-form at high N, and these plants produced 46 per cent more dry matter than the plants at low N. Only minor differences in overall growth occurred with NO −3 or NH +4 plants at low N, but the NH +4 plants had a greater shoot:root ratio. The absorption rate (m mol Ng− root d−1) for NH +4 -N was therefore greater than for NO −3 -N. The cation/anion composition of the plants was affected in a predicable way, and to a greater or lesser extent at high or low N, respectively, in NO −3 or NH +4 plants. The major changes in cation composition came through effects on potassium absorption. Plants with low NO −3 appeared to be under greater N stress than those with low NH +4 because of the lower shoot:root ratio and the greater C∶N ratio in the shoots.
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References
Allen S, Raven J A and Thomas G E 1985 Ontogenetic changes in the chemical composition ofRicinus communis grown with NO −3 or NH +4 as N source. J. Exp. Bot. 36, 413–425.
Clarkson D T 1981 Nutrient demand as the pacemaker for nutrient absorption and root development.In Aspects of Crop Growth Agronomy Conference, A.D.A.S. Eds. J Davies and F E Shotton. pp 1–14. HMSO London.
Clement C R, Hopper M J, Canaway R J and Jones L H P 1974 A system for measuring the uptake of ions by plants from flowing solutions of controlled composition. J. Exp. Bot. 25, 81–99.
Clement C R, Hopper M J and Jones L H P 1978 The uptake of nitrate byLolium perenne from flowing nutrient solution. I. Effect of NO −3 concentration. J. Exp. Bot. 29, 453–464.
Cox W J and Reisenauer H M 1973 Growth and ion uptake by wheat supplied nitrogen as nitrate, or ammonium, or both. Plant and Soil 38, 363–380.
Dijkshoorn W 1958 Nitrate accumulation, nitrogen balance and cation-anion ratio during the regrowth of perennial ryegrass. Neth. J. Agric. Sci. 6, 211–221.
Edwards D G and Asher C J 1974 The significance of solution flow rate in flowing culture experiments. Plant and Soil 41, 161–175.
Hatch D J and Canaway R J 1984 The control of pH in a system of flowing solution culture using a microcomputer. J. Exp. Bot. 35, 1860–1868.
Haynes R J and Goh K M 1978 Ammonium and nitrate nutrition of plants. Biol. Rev. 53, 465–510.
Ingestad T 1979 Nitrogen stress in birch seedlings. II N, K, P, Ca and Mg nutrition. Physiol. Plant. 45, 149–157.
Ingestad T 1982 Relative addition rate and external concentration; driving variables used in plant nutrition research. Plant, Cell Environ. 5, 443–453.
Ingestad T and Lund A B 1979 Nitrogen stress in birch seedlings. I Growth technique and growth. Physiol. Plant. 45, 137–148.
Israel D W and Jackson W A 1978 The influence of nitrogen nutrition on ion uptake and translocation by leguminous plants.In Mineral Nutrition of Legumes in Tropical and Subtropical Soils. Eds. C S Andrew and E J Kamprath. pp 113–129. CSIRO, Melbourne.
Jarvis S C and Robson A D 1983 The effects of nitrogen nutrition of plants on the development of acidity in Western Australian soils. II Effects of differences in cation/anion balance between plant species grown under non-leaching conditions. Aust. J. Agric. Res., 34, 355–365.
Jarvis S C and Hatch D J 1985 Rates of hydrogen ion efflux by nodulated legumes grown in flowing solution culture with continuous pH monitoring and adjustment. Ann. Bot. 55, 41–51.
Lycklama J C 1963 The absorption of ammonium and nitrate by perennial ryegrass. Act. Bot. Neerl. 12, 361–423.
Raven J A and Smith F A 1976 Nitrogen assimilation and transport in vascular land plants in relation to intracellular pH regulation. New Phytol. 76, 415–431.
Robinson D and Rorison I H 1983 Relationships between root morphology and nitrogen availability in a recent theoretical model describing nitrogen uptake from soil. Plant Cell Environ. 6, 641–647.
Sinclair A G 1974 An Auto-Analyser method for determination of extractable sulphate in plant material. Plant and Soil 40, 693–697.
Whitehead D C 1966 Nutrient minerals in grassland herbage. CAB Mimeo Publ. 1/1966. CAB, Farnham Royal.
Williams R F 1948 The effects of phosphorus on the rates of intake of phosphorus and nitrogen and upon certain aspects of phosphorus metabolism in gramineous plants. Aust. J. Sci. Res. (Series B) 31, 331–361.
Woodhouse P J, Wild A and Clement C R 1978 Rate of uptake of potassium by three crop species in relation to growth. J. Exp. Bot. 29, 885–894.
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Jarvis, S.C. The effects of low, regulated supplies of nitrate and ammonium nitrogen on the growth and composition of perennial ryegrass. Plant Soil 100, 99–112 (1987). https://doi.org/10.1007/BF02370934
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DOI: https://doi.org/10.1007/BF02370934