References
- Asher , C. J. and Ozanne , P. G. 1967 . Growth and potassium content of plants in solution cultures maintained at constant potassium concentrations . Soil Sci. , 103 : 155 – 161 .
- Bates , T. E. 1971 . Factors affecting critical nutrient concentrations in plants and their evaluation: A review . Soil Sci. , 112 : 116 – 130 .
- Burns , I. G. and Hutsby , W. 1984 . Development and evaluation of rapid tests for the estimation of phosphate and potassium in plant sap . Commun. Soil Sci. Plant Anal. , 15 : 1463 – 1480 .
- Burns , I. G. and Hutsby , W. 1986 . Cation replacement of potassium in the total shoot of lettuce and its effect on growth during K deficiency . J. Sci. Fd. Agr. , 37 : 129 – 135 .
- Hewitt , E. J. 1966 . Sand and water culture methods in the study of plant nutrition , Tech. Commun. No. 22 431 – 432 . U.K. : Commonwealth Bur. Hort. & Plantation Crops, Farnham Royal .
- Leigh , R. A. and Jones , R. G. Wyn . 1984 . A hypothesis relating critical potassium concentrations for growth to the distribution and functions of this ion in the plant cell . New Phytol. , 97 : 1 – 3 .
- Lipp , A. , Grant , E. and Goodall , D. W. 1958 . Nutrient interactions and deficiency diagnosis in the lettuce. IV. Phosphorous content and response to phosphorous . Aust. J. Biol. Sci. , 11 : 30 – 44 .
- Salter , P. J. 1985 . Crop establishment: Recent research and trends in commercial practice . Scientific Hort. , 36 : 32 – 47 .
- Scaife , A. and Stevens , K. L. 1983 . Monitoring sap nitrate in vegetable crops: Comparison of test strips with electrode methods, and effects of time of day and leaf position . Commun. Soil Sci. Plant Anal. , 14 : 761 – 771 .
- Scaife , M. A. 1974 . “ Computer simulation of nitrogen uptake and growth ” . In Plant Analysis and Fertilizer Problems Edited by: Wehrmann , J. vol. 2 , 413 – 425 . Hanover, , Germany
- Ulrich , A. 1976 . “ Plant analysis as a guide in fertilizing crops ” . In Soil and Plant‐Tissue Testing in California , Div. Agr. Sci. Bull. 1879 Edited by: Reisenauer , H. M. 1 – 4 . Univ. Calif. .