AJPS  Vol.4 No.12 A , December 2013
Distribution and Quantity of Root Systems of Field-Grown Erianthus and Napier Grass
Abstract: Cellulosic bioethanol produced from non-edible plants reduces potential food-fuel competition and, as such, is receiving increasing attention. In the raw material production of cellulosic bioethanol, the aboveground biomass of plants is entirely harvested; consequently, the plant roots represent the major source of organic matter incorporated into the soil. We selected Erianthus and Napier grass as the raw materials for cultivation in Asia. However, information about whether these 2 species provide sufficient root volume to sustain soil fertility is limited. Therefore, we examined the spatial distribution of the roots of these 2 plants, and quantified root mass and length. Erianthus and Napier grass were either grown in fields or greenhouses in Tokyo (Japan) and Lampung (Indonesia), and then their roots were exposed from adjacent soil profiles. Both species developed large, deep roots, penetrating 2.0-2.6 m deep into the soil. Root depth indexes showed that the roots of both species penetrated much deeper into the soil compared to monocot crop species, being more comparable to dicot species. Erianthus developed a root mass and length of 384-850 g·m-2 and 28.8-35.8 km·m-2, while the values for Napier grass were 183-448 g·m-2 and 15.6-43.6 km·m-2, respectively. These values exceeded the maximum values previously recorded for common crop species. Our study confirmed that Erianthus and Napier grass develop deep root systems, with substantially large biomass; hence, we suggest that both plants supply root biomass in large quantities, representing possible major sources of soil organic matter.
Cite this paper: N. Sekiya, F. Shiotsu, J. Abe and S. Morita, "Distribution and Quantity of Root Systems of Field-Grown Erianthus and Napier Grass," American Journal of Plant Sciences, Vol. 4 No. 12, 2013, pp. 16-22. doi: 10.4236/ajps.2013.412A1003.

[1]   T. Hattori and S. Morita, “Energy Crops for Sustainable Bioethanol Production; Which, Where and How?” Plant Production Science, Vol. 13, No. 3, 2010, pp. 221-234.

[2]   R. M. Cruse, M. J. Cruse and D. C. Reicosky, “Soil Quality Impacts of Residue Removal for Biofuel Feedstock,” In: R. Lal and B. A. Stewart, Eds., Soil Quality and Biofuel Production, CRC Press, New York, 2010, pp. 45-62.

[3]   T. Hattori, F. Shiotsu, T. Doi and S. Morita, “Suppression of Tillering in Erianthus ravennae (L.) Beauv. Due to Drought Stress at Establishment,” Plant Production Science, Vol. 13, No. 3, 2010, pp. 252-255.

[4]   K. Ra, F. Shiotsu, J. Abe and S. Morita, “Biomass Yield and Nitrogen Use Efficiency of Cellulosic Energy Crops for Ethanol Production,” Biomass and Bioenergy, Vol. 37, 2012, pp. 330-334.

[5]   Y. Kuzyakov and G. Domanski, “Carbon Input by Plants Into the Soil. Review,” Journal of Plant Nutrition and Soil Science, Vol. 163, No. 4, 2000, pp. 421-431.<421::AID-JPLN421>3.0.CO;2-R

[6]   J. Farrar, M. Hawes, D. Jones and S. Lindow, “How Roots Control the Flux of Carbon to the Rhizosphere,” Ecology, Vol. 84, No. 4, 2003, pp. 827-837.[0827:HRCTFO]2.0.CO;2

[7]   B. Steingrobe, H. Schmid and N. Claassen, “Root Production and Root Mortality of Winter Barley and Its Implication with Regard to Phosphorus Acquisition,” Plant and Soil, Vol. 237, No. 2, 2001, pp. 239-248.

[8]   B. Steingrobe, H. Schmid, R. Guster and N. Claassen, “Root Production and Root Mortality of Winter Wheat Grown on Sandy and Loamy Soils in Different Farming Systems,” Biology and Fertility of Soils, Vol. 33, No. 4, 2001, pp. 331-339.

[9]   N. Sekiya, T. Hattori, F. Shiotsu, J. Abe and S. Morita, “Identifying Potential Field Sites for Production of Cellulosic Energy Plants,” (Unpublished).

[10]   A. Oyanagi, T. Nakamoto and M. Wada, “Relationship between Root Growth Angle of Seedlings and Vertical Distribution of Roots in the Field in Wheat Cultivars,” Japanese Journal of Crop Science, Vol. 62, No. 4, 1993, pp. 565-570.

[11]   P. Jackson and R. J. Henry, “Erianthus,” In: C. Kole, Ed., Wild Crop Relatives: Genomic and Breeding Resources, Springer, Berlin, 2011, pp. 97-107.

[12]   S. C. Tiwari, “Variations in Net Primary Production of Garhwal Himalayan Grasslands,” Tropical Ecology, Vol. 27, No. 2, 1986, pp. 166-173.

[13]   G. Farrell, S. A. Simons and R. J. Hillocks, “Pests, Disease and Weeds of Napier Grass, Pennisetum purpureum: A Review,” International Journal of Pest Management, Vol. 48, No. 1, 2002, pp. 39-48.

[14]   S. D. Angima, D. E. Stott, M. K. O’Neill, C. K. Ong and G. A. Weesies, “Use of Calliandra-Napier Grass Hedges to Control Erosion in Central Kenya,” Agriculture, Ecosystems & Environments, Vol. 91, No. 1-3, 2002, pp. 15-23.

[15]   J. K. Mutegi, D. N. Mugendi, L. V. Verchot and J. M. Kung’u, “Combining Napier Grass with Leguminous Shrubs in Contour Hedgerows Controls Soil Erosion without Competing with Crops,” Agroforestry Systems, Vol. 74, No. 1, 2008, pp. 37-49.

[16]   A. B. Orodho, “The Role and Importance of Napier Grass in the Smallholder Dairy Industry in Kenya,” 2006.

[17]   C. Ma, R. Naidu, F. Liu, C. Lin and H. Ming, “Influence of Hybrid Giant Napier Grass on Salt and Nutrient Distribution with Depth in a Saline Soil,” Biodegradation, Vol. 23, No. 6, 2012, pp. 907-916.

[18]   J. E. Knoll, W. F. Anderson, T. C. Strickland, R. K. Hubbard and R. Malik, “Low-Input Production of Biomass from Perennial Grasses in the Coastal Plain of Georgia, USA,” Bioenergy Research, Vol. 5, No. 1, 2012, pp. 206-214.

[19]   A. Oyanagi, “Gravitropic Response Growth Angle and Vertical Distribution of Roots of Wheat (Triticum aestivum L.),” Plant and Soil, Vol. 165, No. 2, 1994, pp. 323-326.

[20]   S.-H. Cheng, L.-Y. Cao, J.-Y. Zhuang, W.-M. Wu, S.-H. Yang and X.-D. Zhan, “A Breeding Strategy for Hybrid Rice in China,” In: F. Xie andB. Hardy, Eds., Accelerating Hybrid Rice Development, IRRI, Manila, 2009, pp. 25-34.

[21]   Y. Izumi, K. Uchida and M. Iijima, “Crop Production in Successive Wheat-Soybean Rotation with No Tillage Practice in Relation to the Root System Development,” Plant Production Science, Vol. 7, No. 3, 2004, pp. 329-336.

[22]   Y. Fukuzawa, Y. Komiya, M. Ueno and Y. Kawamitsu, “Relationship between the Development of the Root System and Initial Growth of Sugarcane (in Japanese with English Abstract),” Japanese Journal of Crop Science, Vol. 78, No. 3, 2009, pp. 356-362.

[23]   A. Oyanagi, T. Nakamoto and M. Wada, “How Deep Should We Measure Root Length to Find a Varietal Difference of Root Distribution in Wheat?” In: J. E. Box, Ed., Root Demographics and Their Efficiencies in Sustainable Agriculture, Grasslands and Forest Ecosystems, Kluwer Academic Publisher, Dordrecht, 1998, pp. 789-793.

[24]   P. J. Gregory, M. McGowan, P. V. Biscoe and B. Hunter, “Water Relations of Winter Wheat: 1. Growth of the Root System,” The Journal of Agricultural Science, Vol. 91, No. 1, 1978, pp. 91-102.

[25]   F. Wiesler and W. J. Horst, “Root Growth and Nitrate Utilization of Maize Cultivation under Field Conditions,” Plant and Soil, Vol. 163, No. 2, 1994, pp. 267-277.

[26]   R. J. K. Myers, “The Root System of a Grain Sorghum Crop,” Field Crops Research, Vol. 3, 1980, pp. 53-64.

[27]   M. Kondo, M. V. R. Murty and D. V. Aragones, “Characteristics of Root Growth and Water Uptake from sOil in Upland Rice and Maize under Water Stress,” Soil Science and Plant Nutrition, Vol. 46, No. 3, 2000, pp. 721-732.

[28]   B. Ball-Coelho, E. V. S. V. Sampaio, H. Tiessen and J. W. B. Stewart, “Root Dynamics in Plant and Ratoon Crops of Sugar Cane,” Plant and Soil, Vol. 142, No. 2, 1992, pp. 297-305.

[29]   P. B. Laclau and J. P. Laclau, “Growth of the Whole Root System for a Plant Crop of Sugarcane under Rainfed and Irrigated Environment in Brazil,” Field Crops Research, Vol. 114, No. 3, 2009, 351-360.

[30]   P. B. Barraclough, “Root Growth, Macro-Nutrient Uptake Dynamics and Soil Fertility Requirements of a HighYielding Winter Oilseed Rape Crop,” Plant and Soil, Vol. 119, No. 1, 1989, pp. 59-70.

[31]   M. V. K. Sivakumar, H. M. Taylor and R. H. Shaw, “Top and Root Relations of Field-Grown Soybean,” Agronomy Journal, Vol. 69, No. 3, 1977, pp. 470-473.

[32]   B. Klepper, H. M. Taylor, M. G. Huck and E. L. Fiscus, “Water Relations and Growth of Cotton in Drying Soil,” Agronomy Journal, Vol. 65, No. 2, 1973, pp. 307-310.

[33]   P. J. Gregory, “Plant Roots: Their Growth, Activity, and Interaction with Soils,” Blackwell, Oxford, 2006.

[34]   R. Lemus and R. Lal, “Bioenergy Crops and Carbon Sequestration,” Critical Reviews in Plant Science, Vol. 24, No. 1, 2005, pp. 1-21.

[35]   Z. Ma, C. W. Wood and D. I. Bransby, “Impacts of Soil Management on Root Characteristics of Switchgrass,” Biomass and Bioenergy, Vol. 18, No. 2, 2000, pp. 105-112.

[36]   Z. Ma, C. W. Wood and D. I. Bransby, “Soil Management Impact on Soil Carbon Sequestration by Switchgrass,” Biomass and Bioenergy, Vol. 18, No. 1, 2000, pp. 469-477.