Advanced SearchSearch Tips
pH Variance Model Depending on Phosphate Ion Form
facebook(new window)  Pirnt(new window) E-mail(new window) Excel Download
 Title & Authors
pH Variance Model Depending on Phosphate Ion Form
Soh, Jae-Woo; Soh, Soon-Yil; Nam, Sang-Yong;
  PDF(new window)
This experiment was performed to develop a model for nutrition ion concentration and EC in regard to change in pH from 4.0 to 8.0 in nutrient solution. The pH changes according to the variation of and in the nutrient solution while variation of EC increased from pH 4.0 to 5.0, stabilized from pH 5.0 to 7.0 and increased again from pH 7.0 to 8.0. For the variance of major elements in the nutrient solution, K, Ca, N and P increased while pH was higher, especially the variables for K and P were increased largely. On the other hand, variables of Mg and S were stable. Based on analysis of the ion balance model of nutrient solution, the cation increased than anion over rising the variation of pH while balance point of ion moved from a-side to d-side. In addition, the imbalance increased while it moved away from the EC centerline as variance of pH increased. It was larger than effect of EC variance to correction values of equivalence ratios of K and Ca about variation of and while as variance of pH increased, K decreased but Ca increased. These showed the result that variance of pH about correction values of equivalence ratios of K and Ca gave a second-degree polynomial model rating of 0.97. Through this research, it was identified the pH variable model about variance among pH, ion and EC according to gradient of phosphate.
absorption pattern;hydroponics;mineral balance;mutual ratio;plant factory;
 Cited by
Ahn, T.I., J.W. Shin, and J.E. Son. 2010. Analysis of changes in ion concentration with time and drainage ratio under EC-based nutrient control in closed-loop soilless culture for sweet pepper plants (Capsicum annuum L. 'Boogie'). J. Bio-Environ. Cont. 19:298-304.

De Rijck G. and E. Schrevens. 1997. pH Influenced by the elemental composition of nutrient solutions. J. Plant Nutr. 20:911-923. crossref(new window)

De Rijck G. and E. Schrevens. 1998. Cationic speciation in nutrient solutions as a function of pH. J. Plant Nutr. 21:861-870. crossref(new window)

De Rijck G. and E. Schrevens. 1999. Anion speciation in nutrient solutions as a function of pH. J. Plant Nutr. 22:269-279. crossref(new window)

Dysko, J., S. Kaniszewski, and W. Kowalczyk. 2008. The Effect of nutrient solution pH on phosphorus availability in soilless culture of tomato. J. Elementology 13:189-198.

Masuda, M., T. Takiguchi, and S. Matsubara. 1989. Yield and quality of tomato fruits, and changes of mineral concentration in different strengths of nutrient solution. J. Jpn. Soc. Hortic.Sci. 58:641-648. crossref(new window)

Robinson, R.A. and R.H. Stokes. 1959. Electrolyte solutions. Courier Dover Publications, London.

Rush, J.B. 2005. Hydroponics - A practical guide for the soilless grower. CRC press. p. 63-115.

Soh J.W. and Y.B. Lee. 2012. Estimated EC by the total amount of equivalent ion and ion balance model. Korean J. Hortic. Sci. Technol. 30:694-699. crossref(new window)

Soh, J.W., K.S. Han, S.C. Lee, J.S. Lee, O.D. Kwon, and Y.B. Lee. 2012. Design of model of ion and electric conductivity. J. Bio-Environ. Cont. (Suppl. 2):133-134. (Abstr.)

Steiner, A.A. 1961. A universal method for preparing nutrient solutions of certain desired compositions. Plant Soil 15:134-154. crossref(new window)

Steiner, A.A. 1980. The selective capacity of plants for ions and its importance for the composition and treatment of the nutrient solution. Acta Hortic. 98:87-97.

Steiner, A.A. 1984. The universal nutrient solution, Proceedings of IWOSC 1984 6th International Congress on Soilless Culture. p. 633-650.

Tanji, K.K. 1960. Predicting specific conductance from electrolytic properties and ion association in some aqueous solution. Soil Sci. Soc. Am. Proc. 33:887-889.

Trejo-Tellez, L.I. and F.C. Gomez-Merino. 2012. Nutrient solutions for hydroponic systems, p. 1-22. In: Toshiki A. (ed). Hydroponics - A standard methodology for plant biological researches. InTech, Janeza Trdine 9, 51000 Rijeka, Croatia.