Source: Xizhen (1998a) FW: Fresh weight
Source: Xizhen (1998a) FW: Fresh weight by 23.9 percent and 12.1 percent if 30 kg/ha ZnSO4 or 15 kg borax are used, respectively; and that yield is increased by 38.9 percent if both of them are used together. The tendency and profile of absorption of Zn and B by ginger is similar to that of N, P, and K (Xiaoyun et al., 1993, 1994).
Ginger needs a warm climate and cannot withstand cold, and hence its planting should be adjusted to avoid the winter cold. The following conditions should be considered before the planting time is confirmed:
1. Soil temperature should be above 15°C;
2. Ginger growth period takes more than 135 to 150 days from sprouting to the first frost; the effective accumulated temperature in the growing period should amount to 1,200 to 1,300°C;
3. Adjust the rhizome-forming stage to coincide with the months that have suitable temperatures that favor rhizome expansion.
In warmer areas ginger can be planted from January to April. In the Valley of the Yangtze River, it should be planted from the last 10 days of April to the first 10 days of May. In the Hubei area, it is usually planted in the first 10 days of May. In the northeastern and northwestern areas and other high and frigid zones, ginger cannot be planted in the field condition because of the prevailing cold weather.
Planting time is crucial in ensuring high yield. Too early planting while the soil temperature is still low will affect germination. If planted too late, the growing period will be shorter and the rhizome yield will be affected. Studies have shown that delay in planting results in a lower yield of ginger (Table 6.7).
Cultivating strong buds is the chief technique of successful ginger production (Zhao et al., 1992). Because young buds are the foundation of the seedlings, only strong buds can grow into strong seedlings, and strong seedlings provide a good foundation for vigorous plants and for rhizome formation. Therefore, seeds should be treated as necessary to cultivate strong buds before planting.
Strong buds are usually shorter and thicker, their tops are obtuse and rounded, whereas weak buds are smaller, with pointed tips or somewhat curved (Figure 6.7). The following factors determine whether buds are strong or not.
Nutritional Condition of Seed: In general, if the rhizome is fat, has a bright color, and is provided abundant nutrition, the buds would be fat and strong. If the rhizome balls (fingers) are thin and small, the nutritional condition is poor, and the buds will usually be weak. So we should choose fat rhizomes as seed in order to cultivate strong buds.
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