Since ginger is cultivated with high doses of organic manure and green leaf mulch, an additional supply of secondary and micronutrients is not usually required. However, Roy et al. (1992), West Bengal, India, had observed that in local cultivars of ginger, the highest yield of 48.8 t/ha was obtained with a combination of 0.3 percent zinc, 0.2 percent iron, and 0.2 percent boron. Wang et al. (1993) reported that zinc affects protein synthesis and RNA metabolism leading to amino acid accumulation under zinc deficiency. Srinivasan et al. (2003) carried out a study on zinc nutrition of ginger. They found that zinc deficiency exists in 49 percent of soil samples analyzed from various ginger-growing regions of India. Their study indicated that zinc application at 5 kg/ha increased the rhizome yield significantly. The culture model they developed indicated that 6 kg/ha zinc is the best for maximizing the yield.
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