Weedicides For Ginger

35,269.5

Source: Xianchang et al. (1996) Cultivation and Weeding

Source: Xianchang et al. (1996) Cultivation and Weeding

The rhizome of ginger grows underground; it requires loose soil with good aeration. Therefore, weeding and intercultivation are essential. Ginger plants grow slowly in the seedling stage, and this stage is in the rainy season and, hence, weeds grow vigorously. If timely weeding is not done, yield reduction results. So clean cultivation is important in good management to ensure strong plants and good yield. Now weedicides, such as nitrofen, chlomethoxyfen, and others are often used in the ginger field.

Irrigation

The roots of ginger are short and plump and require ample soil moisture for growth and hence often need irrigation. But ginger seedlings cannot endure waterlogging. So irrigation should be regulated to the water requirement characteristic of the crop so as to ensure vigorous and healthy growth.

The soil temperature is lower in the germinating stage. In order to increase it and ensure that seedlings emerge favorably, the field is usually irrigated before planting, and this irrigation will do until seedlings appear, except when the soil is too dry. If the soil water content is low, the first irrigation should be given when 70 percent of the seedlings come out, usually in 25 to 30 days after planting, and the second should be two to three days afterward. Then the land is cultivated so as to hold soil moisture.

In the seedling stage the plants are small, grow slowly, and need less water. In the north of China, the seedling stage is in the drought season—at the end of spring or in the beginning of summer—so irrigation has to be given to keep the relative moisture content of the soil at about 70 percent. In the south of China, the temperature is lower and it rains more during the seedling stage, so deep drains should be provided. The air temperature increases in the later period, and depending upon the soil moisture, irrigation should be planned. During the vigorous growing stage it is turning cool in the north of China, when autumn begins, so ginger plants enter into the stage of vigorous growth; more and more tillers and leaves are produced, and rhizomes begin to expand. At this stage, plants need more water. In order to meet this water requirement during the vigorous growth, irrigation once every four to six days is essential so as to keep the relative humidity of soil at 70 to 80 percent.

Fertilizer Application

The period of ginger growth and development is long and hence this crop needs more fertilizer. So besides the base fertilizer, the crop needs additional applications in the course of growth and development. The requirements are different at different stages, and the absorption speed also is different. So a proper quantity of fertilizer should be given in every stage based on the crop requirements (Xizhen, 1997a, b).

The fertilizer requirement is very little in the germinating stage as the plants mainly grow using stored nutrition. In the seedling stage, again the plants need little fertilizer, the roots are not developed yet, and their capacity of absorption is still weak. So little fertilizer is required to promote seedling growth. In general, additional fertilizers are not required until plants reach about 30 cm in height and have one to two tillers. About 300 kg/ha salvolatile or phosphatic ammonium should be added at this time.

When the autumn begins, the growth becomes faster and the plant enters the vigorous growing stage. Then the plants need more fertilizer. Additional fertilizer should be supplied at the rate of 1,125 kg bean cake or 750 kg soybean and 750 to 1,125 kg compound fertilizer per hectare. The method is as follows: after the mulching straws are removed, a channel is dug, which is about 15 cm deep at the north side of every trench (transmeridional trench) or east side (south—north trench), fertilizer is spread in the ditch and covered with soil and irrigated. Toward the middle of September, rhizome development becomes active. To ensure sufficient nutrition for rhizome development, the third additional fertilizer should be supplied—450 to 750 kg/ha compound fertilizer is usually used at this time. The effect of fertilizer doses on growth and yield is given in Table 6.18.

For good rhizome development, earthing up is essential. This operation is carried out at about the beginning of autumn by taking soil from the ridges and applying it to the base of plants, turning the former trenches into ridges. After that, earth up for a second and a third time combining with irrigation, widen and thicken the ridges gradually, and create a moist, loose, fertile soil condition for rhizome growth and full expansion. In the south, the earthing up operation usually starts from the summer solstice.

Table 6.18 Effect of fertilizers on growth and yield of ginger (1996)

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  • janis frazier
    How to controle weedisides in ginger crop?
    8 months ago

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