Characterization and preliminary evaluation of factors for early growth in sugarcane (Saccharun1 officinarum)
2003
Aboagye, L.M., Plant Genetic Resources Centre, CSlR, P. 0. Box 7, Bunso, Ghana | Terauchi, T., Japan International Research Centre for Agricultural Sciences, Okinawa Sub-tropical Station, 1091-1 Maezato, Kawaraburu, lshigaki, Okinawa, 907 Japan | Matsuoka, T., Japan International Research Centre for Agricultural Sciences, Okinawa Sub-tropical Station, 1091-1 Maezato, Kawaraburu, lshigaki, Okinawa, 907 Japan
Sugarcane has a very slow growth during the early part of Its life. An experiment was conducted under field conditions to identify, characterize. and evaluate traits that could improve its productivity during this phase. Two sugarcane cultivars, Ni9 and NiFJ, were used. They werc planted at an average of 4.16 plants m" normal density (HD) and 6.25 plants m high density (HD). The cultivars were sprayed with GA, to modify the canopy structure. and the growth characteristics were analyzed. For dry matter production and leaf characteristics, ditTerences between the treated and control plants were significant in most of the traits studied at I month aner the treatment. In the later stages. the differences between the treatment and the control were not significant, but the difterences between Ni9 and NiF3ND and between NiF3ND and NiF3HD were significant. Within the canopy structure. leaf area concentration and leaf area index (LAI) were greater in the control of the cultivars, resulting in reduced light penetration. In the treatments with a rclatively lower LAI and even distribution of leaf area, Iight penetration was greater. Ideal traits proposed for higher productivity in the early growth phase in sugarcane include moderately tall plant. long and large leaf. even distribution of leaf area in the canopy, maximum but not excessive number of tillers, and greater dry matter allocation for leaf development.
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