Fertilizer Application

Ginger exhausts soils. The crop is mainly potassium (K) and nitrogen (N) exhausting; magnesium (Mg) and phosphorous (P) removal being intermediary (Nagarajan and Pillai, 1979; Lee et al., 1981). Results of analyses of vegetative plant parts give a similar trend. Plant parts development and yield response to timing of fertilizer application aimed at achieving fertilizer use efficiency is presented in Table 7.1. Levels of trace elements Mg/K maximum: arsenic 5, lead 10, copper 20, and zinc 50 are the prescribed levels fixed by processors in ginger of commerce (See also Roy et al., 1992). Therefore, application of minor elements is necessary for successful ginger technology. But the question is the rationale for fertilizer usage in ginger production if the economics of the process is carefully worked out. Fertilizer mix used varies from place to place, and is based on farmers' experience. The variable doses are of interest because of possible environmental pollution effects and to ascertain the marginal costs/merits of the fertilizer usage. These

Table 7.1 Fertilizer mix and use in various countries

Country

Fertilizer mix

Rate (kg/ha)

N composition

Source

Fiji

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