8342937095

COPPER AND LIMĘ INTERACTION ON THE GROWTH OF CORN ON TROPICAL PEAT

(1967) indicated that liming peai soils at about 14 t ha^-1 increased soil pH to 5.75 and 4.3, respec-tivcly. Differencesobserved on thesoil pH value$ despite the same ratę of limę added by these re-searchers could bedue to heterogeneity ofinitial soil pH and variousstagesof peatdecomposition. Nevertheless, theresultsimply that liming peatsoil to obtain pH of about 4.40 could result in better growth of sweet corn.

CONCLUSION

In thisstudy, the application of copper in the form ofcoppersulphate and limeat theratcsof 5 kg Cu

ha"¹ and 4 t limę ha ¹ to a peat soil gave optimum drymatteryieldof sweet corn. Application of morę than 16 kg Cu ha”¹ reduces the uptake of Cu by corn at all liming rates. The study indicates that peat soil containing less than 8.7/ig g"¹ DTPA extractable copper should be recommended for copper fertili/aton. It is also suggested that for maximum growth of corn, the pi 1 of peat should be at least 4.40.

ACKNOWLEDGEMENTS

The authors wish to express their gratitude to Universiti Pertanian Malaysia forfinancialsupport of this research. They would also like to thank Prof.Othman Yaacoband Dr. Y.M. Khaniffor tłieir valuable commen ts on this manuscript. The authors also wish to thank Mr. Mohd Fuzi Shariff for his assistance in soil analysis.

REFERENCES

BAKER. D.E. and M.C>. Amachfk. 1982. Nickel, Copper, Zinc and Cadmium. In Methods of Soil Analysis Part 2. No.9 (Part 2). Soil Science Society of America, Inc. Madison, Wisconsin, t^SA.

Cl iew, W.Y. 1973. EfTectsof Limę and Fertilizerson the Plant Availability of Soil Nitrogen in a Malaysian peat. M. Agr Sc. Thesis. Univ. Malaya.

Ciikw. W.Y..C.N. Williams,KT. Joseph and K. Rami 1976. Studies on the Availability to Plants of Soi Nitrogen in Malaysian Tropical Oligotrophic Peai I. Effect of Liming and pH. Trop. Agric. (Tńnidac 53:69-77.

Cottenie, A., M. Verloo, L. Kiekens and R. CAMERLYNCK. 1982. Chemical Analysis of Plants and Soils, p.42-43. Laboratory of Analytical and Agrochemistry, State University Ghent-Belgium,

John, M.K. 1972. Automated Digestion System for Safe Use of Perchloric Acid. Anal. Chem. 44(2):429-

430.

JOSEPH. K.T., W.Y.Chew andT.H.TAY 1974. Potential ofPeat for Agriculture. MARDI Report No. 16:1-16.

KANAPATHY. K. 1967. Progress of Peat Research. Division of Agriculture, Ministry of Agriculture and Co-operatives. Dept. Conference. Information Paper No. 13. p 1-5, Mimeograph.

Kanapathy, K. 1976. Guide to Fertilizer Use in Peninsular Malaysia. Ministry of Agriculture and Rural Development Malaysia. Bulletin No. 143. p. 7.

Katyau J.C. and N.S. Randhawa. 1983. Micron utrients. FAO, Fertilizer and Plant Nulrition Bulletin No, 7. p.51.

Kerndorff, H. and M. ScHNiT/.ER. 1980. Sorption of Metalson HumicAcid. Geochim. Cosmochim. Acta 44: 1701-1708.

Kueh. S.H. 1990. Copper Rcquiremem of Cassava (Manihotesculenta cranIz) and itsRcsidual Effectson a Peat Soil in Sarawak. Seminar and lOth Meeting on Standardisalion oj Soil, Plant, and Fertilizer Analysis and their Inlerpretalion, 6-7 March, 1990. Kuching, Sarawak, p. 132-140.

LEE S.C..J.S. Lim and W. OMAR. 1988. Micronutrient Status in Major Soils in Peninsualr Malaysia. Papaer presented at the National Seminar on Serondry and Micronutrients in Malaysian Agriculture, Kuala Lumpur. (Proceedings in press).

LlNDSAY, W.l..,and W.A. Norvell. 1978. Development of a DTPA Soil Test for Zinc, Iron, Manganese and (:< >,>| ><• i SM Sn % Attl}. 42: 421-428.

Lucas. R.E.andJ.F. Dayis. 1961. Relationshipsbetween the pH Values of Organie Soils and Availabilities of 12 Plant Nutrients. Soil Sci. 92:177-182.

Lucas, R.E. and B.D. KNEZEK. 1972. Climatic and Soil Conditions Promoting Micronutrient Deficiencies in Plants. In Micronutrients in Agriculture. Soil Sci. Soc. of America, p. 268. Inc. Madison, Wisconsin.

McLaren, R.G. 1972. The Chemistry of Soil Copper and ics Availability to Plants. Ph.D Thesis. University of Nottingham.

Stf.VENSON. F.J. 1982. Hu mus Chemistry, Genesis, Composilion Reactions. New York: John Wiley 8c Sons.

Tisdalf., S.L., W.L. NelsonandJ.D. Beaton. 1985. Soil FertiUty and Fertilizers, p. 361-363. New York: Macmillan Publishing Company.

Walworth, J.L., W.S. Letzsch and M.E. Sumner. 1986. Use of Boundary Lines in Establishing Diagnostic Norms. Soil Sc. Soc. Am.J. 50: 123-128.

Webb, R.A. 1972. Use of the Boundary Linę in the Analysis of Biological Data.J. Hart. Sci. 47: 309-319.

(Recewed 16 Nouember, 1990)

PFRTANIKAV01 14 MOI IQQ1

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