Source: Ravindran et al. (1994).

Source: Ravindran et al. (1994).

are known to vary with the soil type, cultural conditions, and climate (Ravindran et al., 1994).

Mohanty and Sarma (1979) reported that expected genetic advance and heritability estimates were high for the number of secondary rhizome and total root weight. Genetic coefficient of variation was high for weight of root tubers. Rhizome yield was positively and significantly correlated with number of pseudostems (tillers), leaves, secondary rhizome fingers, tertiary rhizome fingers, total rhizome, plant height, leaf breadth, girth of secondary rhizome fingers, and number and weight of adventitious roots. Studies indicated that straight selection was useful to improve almost all characters except the number of tertiary fingers and straw yield. Rattan et al. (1988) reported that plant height was positively and significantly correlated with number of leaves, leaf length, rhizome length, rhizome breadth, and yield per plot. The number of leaves per plant was positively and significantly related to rhizome length, breadth, and yield. The rhizome length was also related to rhizome breadth and yield. Positive correlation of rhizome weight with plant height, number of tillers, and leaf number was reported by Sreekumar et al. (1980). Mohanty et al. (1981) observed a significant varietal differences for all the characters except for the number of tillers per plant and number of leaves per plant. Pandey and Dobhal (1993) observed a wide range of variability for most of the characters studied by them. Rhizome yield per plant was positively associated with plant height, number of fingers per plant, weight of fingers, and primary rhizome.

At IISR, Sasikumar et al. (1992b) studied 100 accessions of ginger germplasm for variability, correlation, and path analysis. They found that rhizome yield was positively correlated with plant height, tiller and leaf number, and leaf length and width (Table 2.18). Plant height also had a significant and positive association with leaf and tiller number as well as length and width of leaf. The association of leaf number with tiller number, leaf length, and leaf width was also positive and significant. Tiller number had a significant negative association with dry recovery. Leaf width had a positive significant association with dry recovery.

Table 2.18 Character associations in ginger

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