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RICE ROOT GROWTH IN RELATION TO SIZE, QUANTITY, AND RIGIDITY OF PORES

S. KAR and B. P. GHILDYAL
Plant and Soil
Vol. 43, No. 3 (DECEMBER 1975), pp. 627-637
Published by: Springer
Stable URL: http://www.jstor.org/stable/42946977
Page Count: 11
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RICE ROOT GROWTH IN RELATION TO SIZE, QUANTITY, AND RIGIDITY OF PORES
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Abstract

Experiments were conducted to study the influence of porosity, pore size and pore rigidity of sands, developed in tubes and culture vessels, on rice root growth. The root growth parameters included: number of penetrating roots, length, length of radicle above sand surface, depth of penetration, diameter near the tip and base, volume and fresh weight. The relationships between porosity, pore size of sand and root growth parameters were found to be nonlinear. A porosity of 51.6% was most favourable to rice root growth and penetration. The root tips could expand an average macropore size of 75 µ for their penetration. In fine sand (150-50 µ), though the pore size was very narrow, roots were able to penetrate because of low rigidity of pores. The increasing pore rigidity of sand abridged root penetration. The critical rigidity in terms of penetration pressure was measured to be 435 kg cm⁻² with coarse sand (400-320 µ). The rigidity of pore structure depended largely on particle size and porosity of sands. The penetration pressure was reduced with decrease in particle size of sand.

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