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was better under shade than in an open situation, the crop was considered to be shade loving and suitable as an intercrop in coconut gardens (see Figure 5.6). The uptake studies showed that the fertilizer requirement for intercropped ginger in low shade levels will be 10 to 50 percent higher than that of a pure crop.

Ancy et al. (1993) studied Rio de Janeiro plants, grown under 0, 25, 50, or 75 percent shade (provided by dry coconut fronds) and supplied with fertilizers at 75, 100, 125, or 150 percent of the recommended rate of 75, 50, and 50 kg of N, P2O5, and K2O/ha. The volatile oil content was highest (2.19 percent on a dry weight basis) under 25 percent shade, and the NVEE content was significantly higher under 25 or 50 percent shade than under 0 or 75 percent shade. The rhizome fiber content was not affected by shade and fertilizer treatments.

Nath (1993) at Assam, India evaluated the effect of shade (provided by a pigeon pea crop) and rhizome treatment (1 percent formaldehyde) on rhizome rot caused by Pythium myriotylum using the cv. Tura. The highest yield was recorded in rhizome-treated plants grown in the shade for 150 days. The increased yield was mainly due to reduction of disease, as disease incidence was 45.8 and 41.3 percent respectively, in the control and rhizome-treated plants grown without shade and 19.4 percent in rhizome-treated plants grown in the shade. It is suggested that the temperature around the crop may have been reduced by shading and this could have ultimately suppressed the growth of fungus. Wilson and Ovid (1993) studied the effect of shade on growth and yield of ginger and observed that the average yield of ginger was highest (68.4 t/ha) under okra shade.

Ancy et al. (1998) noted that nutrient uptake increased with increasing fertilizer rate under all shade intensities but the response in terms of rhizome yield per unit increase in fertilizer rate was highest under 25 percent shade followed by 50, 0, and 75 percent shade. Dry rhizome yield was highest (3,415.25 kg/ha) under 25 percent shade with nitrogen, phosphorus, and potassium (NPK) at 150 percent of the recommended rate.

Table 5.4 Effect of shade on volatile oil content of ginger (v/w%)

Period (DAP)

Table 5.4 Effect of shade on volatile oil content of ginger (v/w%)

Period (DAP)

Shade (%)

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