Seed price and planting method of konjac

Konjac, also known as Amorphophallus, Amorphophallus, etc., is a perennial herb of the Araceae family. It has been cultivated in China for more than 2000 years. In ancient China, it has been called "gut sand". Now it is widely cultivated in Yunnan, Guizhou, Sichuan, southern Shaanxi and western Hubei. Let's take a look at the seed price and planting method of konjac.

How much is the konjac seed per jin?

The price of konjac seed is about 40.6 yuan per jin, but it varies according to the quality, variety, origin and market of the seed. In fact, the "seed" of konjac is not a botanical seed, and its formation process is very special. The konjac "seed" bred by sexual reproduction is a typical asexual organ-small bulb in morphology. The price of the first generation and the second generation of seeds is different, the price is also different in different places, and the price fluctuates greatly.

Planting conditions of Amorphophallus

1. Soil: konjac requires that the soil layer is deep, loose and fertile, rich in organic matter and humus, the most suitable PH (pH) is 6.5-7.5, generally can grow in PH5.5~6.5 or PH7.5~8.

2. Humidity: konjac requires sandy loam with good soil drainage, low groundwater level, soil water content of 50-65%, air relative humidity of 55-70%, and annual rainfall of 1000-1500 mm.

3. Temperature: during the growth period of konjac, the suitable temperature is 1525 ℃, the growth is restrained over 35 ℃, the seedling is naturally fallen below 12 ℃, the dormant period can endure-5 ℃, and the underground tuber below-8 ℃ suffers frost injury.

4. Light: konjac is a shade-tolerant crop, which is most afraid of direct light, which requires weak sunshine intensity and short hours. The optimum light intensity for aboveground development is 1 × 3 of sunlight, and dark light is needed for root development.

How to plant konjac seeds?

1. Soil preparation and fertilization: after selecting the planting land, Konjac ploughed the land once in autumn and winter, combined with farm manure according to the actual situation, selected sunny weather and soil preparation before sowing, and planted with deep ditch and high border, the width of the box was 1 meter, and the height of the border was 15-25 cm.

2. Seed selection: konjac seed selection bud nest is small and shallow, the corm is full, the terminal bud is strong, there is a circle of broken or shedding fibrous root in the upper part of the tuber, the lower part and bottom surface are smooth, no root, no wrinkle, no scar, no injury, and the weight is 300g.

3. Seed disinfection: before sowing, konjac seeds should be soaked with 10 million units of agricultural streptomycin soluble powder mixed with 20 kg of water (1000PPM) for 1 hour and then dried for 1 or 2 days, so as to reduce the occurrence of diseases.

4. Planting time: konjac seeds are generally sown when the soil temperature of 10 cm is more than 12 ℃. According to the local climate, it is usually appropriate from early March to late April, no later than the first ten days of the month, and can also be planted before winter.

5. Sowing method: when planting konjac, two adjacent rows should be staggered, the seed taro is placed in the ditch at an angle of 45 degrees, the top bud on the slope is upward, the seed taro is rhizome, the top bud is placed continuously in one direction, and then cover the soil, fertilize the soil, and cover the soil again.

Planting management of konjac

1. Cover management: after sowing, konjac should make great efforts to collect all kinds of crop mulch, such as straw, pod shell, withered leaf, etc., so as to reach the standard of "grass is not a mound and the land is not exposed to white". Generally, about 2000 jin of mulch is needed per mu, and attention should be paid to removing the unrotten mulch after September.

2. Weed removal: the root system of Amorphophallus konjac is distributed shallowly. In order to prevent ploughing and weeding from scratching the young roots and underground stems and affecting the normal growth of the plant, weeds can be pulled out by hand, but only squatting in the furrow and pulling weeds, do not step on the ridge surface, to prevent crushing the underground rhizome.

3. Clear ditches and cultivate soil: konjac is not only afraid of drought but also unsuitable for impregnation, so the planted fields should go to the fields for inspection in the rainy season, especially after the rainstorm, to dredge ditches and drain water to ensure a smooth waterway. Combined with clearing the ditch, the fine soil in the ditch is cultivated to the ridge surface.

4. Scientific topdressing: Konjac topdressing mainly applies rotten manure water when emerging and spreading leaves, and dry pig manure residue can also be applied between plants through Rain Water into the soil for konjac root absorption and utilization, in order to avoid root burning, it is best to choose clear manure topdressing fertilizer, if the base fertilizer is insufficient, compound fertilizer can be applied.

Disease and pest control of konjac

1. Soft rot

[symptoms] affect petioles, bulbs and leaves, blackening and softening the tissue, emitting a foul smell, and even pieces of fruit rotting and lodging.

[prevention and control] strengthen the management of cultivation, regularly deep ploughing, drainage and ventilation, careful selection of seeds without decay and wound, and soaking them with appropriate proportion of agricultural streptomycin solution before sowing.

2. White silk disease

[symptoms] affect the base of the petiole, resulting in damage to the petiole or corm.

[prevention and control] to strengthen management and eliminate stagnant water in time, instead of continuous cropping and intercropping with peanuts, Solanaceae and soybeans, appropriate proportion of Bordeaux solution can be used to spray and disinfect the surrounding areas where the petiole is in contact with the soil surface during the period from konjac head change to corm expansion.

3. Leaf blight

[symptoms] damage leaves, bacteria infection ability is very strong, resulting in pieces of konjac wilt and death.

[control] the prevention and control measures of leaf blight are basically the same as those of soft rot.

4. Insect pests

[symptoms] the main pests affecting the growth of konjac are sweet potato armyworm, konjac nematode, bean slug moth and so on.

[control] weeds and dead leaves were removed during winter and spring, konjac and corn were intercropped in the field, insecticides could also be used to remove insect pests, and attention should be paid to the selection of mature farm manure when using farm manure.