Plant and Soil

, Volume 77, Issue 2–3, pp 347–365

Macro nutrient cation uptake by plants

II. Effects of plant species, nitrogen concentration in the plant, cation concentration, activity and activity ratio in soil solution
  • N. E. Nielsen
  • E. M. Hansen
Article

Summary

In pot experiments with barley, mustard, leek, lettuce and spinach, and in a field experiment with 30 cultivars of barley uptakes of K, Mg, Ca, Na and N were studied at varying concentrations and activities of these cations in the soil solution.

The sum of macro cations (K, Mg, Ca, Na) in meq per 100 g aerial plant parts were independent of the chemical composition of the soil solution, but dependent on plant species and on the N concentration in the plant.

The ratios\((\bar I_{Mg} /\bar I_{Ca} and \bar In_K /2(\bar In_{Ca} + \bar In_{Mg} ))\) of mean net inflows of Mg, Ca and K into plants and corresponding cation activity ratios (aMg/aCa and\(a_K /\sqrt {a_{Ca} + a_{Mg} } \)) in the soil solution were linearly related and highly correlated under conditions in which growth rate and/or rate of incorporation into new tissues constituted the rate determining step of cation uptake. Consequently, mean net inflows of K, Mg and Ca were independent of ion concentration and ion activity of K, Mg or Ca in the soil solution under the conditions of constant activity ratio.

The results agree with the concept that plants have a finite cation uptake capacity, and that plants are in a equilibrium-like state with the activities of K, Mg, and Ca ions in the soil solution. The results indicate that both ratios and content of exchangeable cations should be considered in our evaluation of soil test data.

Key words

Barley Ca Cation activity Cation activity ratio Cation concentration Ion uptake Mg Mustard Leek Lettuce Soil solution Spinach Uptake capacity Uptake ratio Net inflow 

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References

  1. 1.
    Adams F 1971 Ionic concentrations and activities in soil solutions. Soil Sci. Soc. Am. Proc. 35, 420–426.Google Scholar
  2. 2.
    Alston A M 1972 Availability of magnesium in soils. J. Agric. Sci. Camb. 79, 197–204.Google Scholar
  3. 3.
    Beckett P H T 1971 Potassium potentials — A review. Potash Review Subject, 5 Suite 30, 1–41. Intern. Potash Inst. Bern.Google Scholar
  4. 4.
    Beckett P H T 1972 Critical cation activity ratios Adv. Agron. 24, 379–412.Google Scholar
  5. 5.
    Bolt G H 1967 Cation-exchange equation used in soil science — A review. Neth. J. Agric. Sci. 15, 81–103.Google Scholar
  6. 6.
    Bremner J M and Shaw K 1955 Determination of ammonia and nitrate in soil. J. Agric. Sci. 46, 320–328.Google Scholar
  7. 7.
    Bremner J M 1959 Forms of nitrogen in soils and plants. Rep. Rothamsted Exp. Sta. 1959, 59.Google Scholar
  8. 8.
    Cunningham R K 1964 Cation-anion relationships in crop nutrition I. Factors affecting cations in Italian rye-grass J. Agric. Sci. 63, 97–101.Google Scholar
  9. 9.
    Glass A D M 1976 Regulatin of potassium absorption in barley roots. An allosteric model. Plant Physiol. 58, 33–37.Google Scholar
  10. 10.
    Hansen E M 1972 Studies on the chemical composition of isolated soil solution and the cation absorption by plants. I. Relationship between form and amount of added nitrogen and absorption of N, K, Na, Ca and Mg by barley. Plant and Soil 37, 589–607.Google Scholar
  11. 11.
    Itallie T B van 1938 Cation equilibria in plants in relation to the soil. Soil Sci. 46, 175–186.Google Scholar
  12. 12.
    Jensen P and Pettersson S 1978 Allosteric regulation of potassium uptake in plant roots. Physiol. Plant. 42, 207–213.Google Scholar
  13. 13.
    Jones R G Wyn 1975 Excised roots.In Ion Transport in Plant Cells and Tissues. Ed D A Barker and J L Hall. North-Holland Pub. Co. pp. 193–229.Google Scholar
  14. 14.
    Nemeth K 1963 Phatometrisch Sulfatbestimmung in der Bodenlösung. Z. Pflanzen Ernaehr. Dueng. Bodenkd. 103, 193–196.Google Scholar
  15. 15.
    Nielsen N E 1972 A transport kinetic concept of ion uptake from soil by plants. I. A method for isolating soil solution from soil with and without plant cover. Plant and Soil 36, 505–520.Google Scholar
  16. 16.
    Nielsen N E 1981 Planteegenskaber (parametre), der pãvirker effektiviteten af planters udnyttelse af jord som næringsstofkilde. I. Studier af forløbet af næringsstofoptagelsen hos 30 bygsorter ved moderat mangel pã phosphor. Rapp. No 1122 Dept. Soil Fertility and Plant Nutrition, 70 pp. ISSN 0105-2543.Google Scholar
  17. 17.
    Nielsen N E and Bille S W 1978 Udbytte og kemisk sammensætning af spinat, salat, persille og porre ved varieret tilførsel af kvæl-stof, udtrykt ved emperiske modeller. Rapp. No. 1114 Dept. Soil Fertility and Plant Nutrition, 31 pp. ISSN 0105-2543.Google Scholar
  18. 18.
    Nielsen N E and Sørensen C B 1984 Macro nutrient cation uptake by plants. I. Rate determining steps in net inflow of cations into intact and decapitated sunflower plants and the intensity factors of cations in soil solution. Plant and Soil 77, 337–346.Google Scholar
  19. 19.
    Olsen C 1950 The significance of concentration for the rate of ion absorption by higher plants in water culture. Physiol. Plant. 3, 152–164.Google Scholar
  20. 20.
    Pitman M G 1975 Whole plantsIn Ion transport in plant cells and tissues. Ed. D A Barker and J L Hall. North-Holland Pub. Co. pp 267–308.Google Scholar
  21. 21.
    Schofield R K 1947 A ratio law governing the equilibrium of cations in the soil solution. Proc. 11th Intern. Congr. Appl. Chem. 257–261.Google Scholar
  22. 22.
    Sibbesen E 1977 A single ion-exchange resin procedure for extracting plant available elements from soil. Plant and Soil 46, 665–669.Google Scholar
  23. 23.
    Wallace A, Thoth S J and Bear P E 1948 Further evidence supporting cation equivalent constancy in alfalfa. J. Am. Soc. Agron. 40, 80–87.Google Scholar

Copyright information

© Martinus Nijhoff/Dr W. Junk Publishers 1984

Authors and Affiliations

  • N. E. Nielsen
    • 1
  • E. M. Hansen
    • 1
  1. 1.Department of Soil Fertility and Plant NutritionThe Royal Veterinary and Agricultural UniversityCopenhagenDenmark

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