SOIL PHYSICAL CONSTRAINTS AND THEIR EFFECT ON MORPHOLOGICAL CHARACTERS OF COCONUT (Cocos nucifera L. ) ROOTS

  • L P Vidhana Arachchi
  • Yaspa P A J
  • Mapa R B
  • Somapala H.
Keywords: Soil Physical Constraints, Morphological Characters of Coconut

Abstract

The objective of the study was to (1) evaluate land suitability for coconut (cocos nucifera L.) production in relation to soil physical properties, (2) identify the soil physical constraints and (3) study their effect on the morphological adaptation of coconut roots. Soil physical properties were found to be significantly related to coconut yield (R2=81.37; p<0.01). Multiple regression with cluster analysis of soil physical properties vs coconut yield enabled classification of soil series into three major groups namely (a) highly (b) moderately and (c) less productive series. It was observed that the high soil compaction which limited the available water and aeration capacity of soils resulted in retardation of the activity of coconut roots. Water stress due to soil compaction was found to induce production of more inactive roots by suberization and dehydration processes. Scanning electron microscopic image showed that soil compaction and water stress, reduced the cell volume per unit area of the absorption zone and the number of pores in respiratory organs of coconut roots resulting in retardation of water and nutrient absorption, and air exchange processes. This in turn malfunctions of absorption cells and respiratory organs of roots resulted in retardation of growth of coconut seedlings. The practical importance of these findings in formulation of land suitability maps for coconuts is discussed.

References

ALAN, T P B 1991 Growth and mechanical impedance. In plant and roots. (eds Voav Waisel, Amram Eshel and Uzi kafkafi) Publ. marce Dekker, INC. USA pp 393-414

BOONE, F R and VEEN, B W 1994 Mechanism of crop response to soil compaction. In soil compaction in crop production (Eds. Soane, B.D. and Ouwerker C. Van). Publ. Elsvier Science, New York. pp. 237-264.

CHILD, R. 1974. Coconut, Second Edition, Longman group Limited. pp 40-41

DANIELSON, R E and SUTHERLAND, P 1986. Porosity. In Methods and soil Analysis. Part 1, 2nd Ed. ASA Monograph 9. (Ed. A Klute). Am. Soc. Agron. Wisconsin, USA. Pp. 443-460

DAVIS, T A 1968 A study on the respiratory organs of Cocos nucifera Linn. Ceylon Cocos, Quart. 3. 116-136

DAVEY, B G. 1978 Soil structure as revealed by electron microscopy. In modification of soil structure ( W.W. Emerson, R.D. Bood and A R Dextar eds.), New York. John Wiley and Sons Publ. pp 97-102

DAVID, T C 1991 Root structure and sites of ion uptake. In Plant and Roots (Yoav Waisel, Amram Eshel and Uzi kafkafi eds.) New York. Marcel Dekker Publ. pp 417-425

FAO, 1977. Guideline for soil profile description, Food and Agriculture Organization of the United Nations, Rome.

GERARD, C J, SEXTON P and SHAW G 1982. Physical factors influencing soil strength and root growth. Agronomy Journal 74: 875-879.

JAYASEKARA, C 1990. Some notes on coconut root system. Coconut Bulletin Vol. 7 No. 1 / 2 5-7

KARNOVSKY, M J 1965. A formaldehyde-glutaraldehyde fixative of high osmolality for use in electon microscopy. J. Cell Biol. 27: 137-138

KLUTE, A 1986. Water retention: Laboratory methods. In Methods of soil Analysis Part 1. 2nd Ed. ASA Monograph 9. (Ed. A Klute) Am. Soc. Argon. Wisconsin, USA pp. 425-441.

KRISTINA, A V and JANNIE, B 1991. Tree root turnover and senescence. In Plant and Roots (Yoav Waisel, amram eshel and Uzi kafkafi eds.). pp. 287-306. New York. Marcel Dekker Publ.

PEIRIS, T S G and THATTIL, R O 1998. The study of climate effects on the nut yield of coconut using parsimonious models. Expl. Agric. 34: 189-206.

QUISENBERRY, V L SMITH, B R; PHILLIPS, R E; SCOTT H D and NOORTICLIFF S 1993. A soil classification system for describing water and chemical transport. Soil Sci. 156: 306-315

SAS/STAT 1987. Guide version 6 edition. U.K.

SIMMONS, F W; CASSEL, C K and DANIELS, R B 1989 Landscape and soil property effects on corn yield response to tillage. Soil Sci. Sco. Am. J 53: 534-539.

SOANE, B D and VAN OUWERKERK 1994. Soil compaction problems in World Agriculture. In Soil Compaction in crop production (Eds. Soane B D and Ouwerkerk C Van ) Publ. Elsvier Science, New York. pp. 237-264.

SOMASIRI, L L W; NADARAJAH, N; AMARASIRI, L and GUNATHILAKE, H A. 1994. Land suitability assessment of coconut survey area in the coconut triangle (eds. C R Panabokke and Mahindapala, R). Publ. The Coconut Research Institute, Sri Lanka.

SPUR, A R 1969. A low-viscosity epoxy resins embedding medium for electron microscopy. J. Ultrastructure. Res. 26: 31-34.

VIDHANA, ARACHCHI. L P. 1996. Characterization of physical properties of soils and studies on the development of coconut roots. The project report (12/175/149) submitted to the Council for Agricultural Research Policy (CARP), Sri Lanka.

VIDHANA, ARACHCHI L P; SOMAPALA, H; MAPA, R B and YAPA, P A J 1997 Study of the effective root zone of coconut in relation to soil compaction. Annual Sessions of the Sri Lanka Association for the Advancement of Sciences, Nov. 28, Kelaniya, Sri Lanka.

VIDHANA, ARACHCHI L P; (1998) Preliminary requirements to design a suitable drip irrigation system for coconut (Cocos nucifera L. ) in gravelly soils. Agricultural Water Management, 1390: 1-12

VIDHANA, ARACHCHI L P and M de S LIYANAGE (1998). Soil physical conditions and root growth in coconut plantations interplanted with nitrogen fixing trees in Sri Lanka. Agroforestry systems, 39: 305-318.

WILSON, A J and ROBARDS, A W. 1978. The ultrastructural development of mechanically impeded barley roots: effects on the endodermis and pericycle. Protoplasm II 61-72.
Published
2000-12-01
How to Cite
L P Vidhana Arachchi, Yaspa P A J, Mapa R B, & Somapala H. (2000). SOIL PHYSICAL CONSTRAINTS AND THEIR EFFECT ON MORPHOLOGICAL CHARACTERS OF COCONUT (Cocos nucifera L. ) ROOTS. CORD, 16(01), 34. https://doi.org/10.37833/cord.v16i01.337
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Articles