Uptake and distribution of phosphorus in tomato plants
- 136 Downloads
The uptake and distribution of phosphorus was examined in tomato plants, cv. Kirdford Cross, grown in peat to which phosphate was added (P2) or omitted (P1). The plants received a liquid feed containing either a high (N2) or low (N1) concentration of ammonium nitrate. Initially, all plants were grown in peat containing an intermediate level of phosphate.
There was a rapid net export of P from the leaves of plants transferred to the P1 medium resulting in deficiency symptoms before the fruit on the first truss had ripened. Most of the P absorbed by 11-week-old plants in the N1P2 and N2P2 treatments was located in the developing fruit, in the laminae of the mature leaves and in the lower parts of the stem. In the P1 treatments, the lowest fruit truss was the dominant sink for the limited supply of P, but there was also a significant concentration of P in the shoot apex and in the laminae. Increasing the supply of N to plants in the P2 treatment promoted the transport of P to the shoot and to the fruit trusses and also increased the total P uptake. However, plants in the N2 treatment required a significantly higher level of tissue P to prevent the symptoms of P deficiency occurring in the laminae. Generally, symptoms occurred in laminae of mature leaves containing less than 0.13 per cent P. Increases in concentration of tissue P in response to raising the level of applied P were greatest in the petioles of the mature leaves, and it is suggested that these petioles are the most suitable tissues for the assessment of the P status of tomato plants.
Key WordsDeficiency Distribution Fruit Glasshouse Laminae Leaves Nitrogen Peat Petioles Phosphorus Plant Superphosphate Symptoms Tomato Uptake
Unable to display preview. Download preview PDF.
- 1.Bould, C., Bradfield, E. G. and Clarke, G. M. 1960 Leaf analysis as a guide to the nutrition of fruit crops. I. General principles, sampling techniques and analytical methods. J. Sci. Food Agric.11, 229–242.Google Scholar
- 2.Finney, D. J. 1971 Probit analysis 3rd Ed. Published by Cambridge University Press.Google Scholar
- 3.McCollum, J. P. and Skok, J. 1960 Radiocarbon studies on the translocation of organic constituents into ripening tomato fruits. Proc. Am. Soc. Hortic. Sci.75, 611–616.Google Scholar
- 4.Messing, J. H. L. and Winsor, G. W. 1956 Boron in the nutrition of tomato plants. Rept. Glasshouse Crops Research Inst.1956, pp 77–83.Google Scholar
- 5.O'Neill, J. V. and Webb, R. A. 1970 Simutaneous determination of nitrogen, phosphorus and potassium in plant material by automatic methods. J. Sci. Food Agric.21, 217–219.Google Scholar
- 6.Owen, O. 1949 Tomato nutrition. Scient. Hortic.9, 45–49.Google Scholar
- 7.Smilde, K. W. and Roorda van Eysinga, J. P. N. L. 1968 Phosphorus deficiency.In Nutritional Diseases in Glasshouse Tomatoes. Published by the Centre for Agricultural Publishing and Documentation, Wageningen, p. 13.Google Scholar
- 8.Snedecor, G. W. and Cochran, W. G. 1967 One-way classifications. Analysis of variance.In Statistical methods. Iowa State University Press, Ames. Iowa. 6th ed. Chap. 10.Google Scholar
- 9.Sobulo, R. A., Fayemi, A. A. and Agboola, A. 1975 Nutrient requirements of tomatoes (Lycopersicon esculentum) in south west Nigeria. II. Foliar analysis for assessing nitrogen, phosphorus, and potassium requirements Exp. Agric.11, 137–143.Google Scholar
- 10.Varley J. A. 1966 Automatic methods for the determination of nitrogen, phosphorus and potassium in plant material. Analyst, London91, 119–126.Google Scholar
- 11.Ward, G. M. 1964 Greenhouse tomato nutrition-a growth analysis study — Plant and Soil21, 125–133.Google Scholar
- 12.Winsor, G. W. 1973 Nutrition. The U.K. Tomato Manual. Published by Grower Books London, pp. 35–42.Google Scholar