Japanese sweet potato cultivation techniques

Japanese sweet potato cultivation techniques
Biological characteristics: quality yam varieties, high yield; relative to fat, less branching and purple. Ability to develop strong growth, growing period 105-120 days. Productivity 9-15 tonnes / ha. Tubers oblong shape, bark and roots smooth purple, dark yellow intestine. Dry matter content of 27-33%. Matching eat fresh, processing and export.

Breeding:

Propagation (usually by wire or bulb). Wiring must ensure healthy breed, not yet rooted insects and flowers; Wire buds. Age wire from 45-75 days old; Only use paragraph 1 and 2 from the top rope to breed, like wire length 25-30 cm.

Season:

East yam service: 25/8 to 10/9 planted; Spring Summer yam service: planting from mid February to early March.

Prepare the soil:

Arable land must be careful plowing, porous and clean grass; Wide plowed up from 1.2 to 1.5 m, high 35-40 cm.

East to west is the most appropriate (including groove).

Planting techniques:

Note planting when the soil is moist, cool weather; Planting density: 38000-40000 pineapple / ha; distance oscillator 5-6 Wire / m length bed; Single row planting, burying wires along similar between beds and tandem (this string section parallel to the beds), tops on the bed surface 5- 10 cm (2 burn), buried about 5 cm depth.

Fertilisers:

(For 1 ha: 10 to 15 tonnes of manure + 60 N + 30 P2O5 + K2O 90).

Fertilizer Technique:

- Basal: 100% + 100% manure phosphate fertilizer + 30% + 20% potash.

- Four times 1 (after planting 20-25 days): 50% nitrogen + 30% potash.

- Four times 2 (after planting 40-45 days): 20% nitrogen + 50% potash.

Care:

- 1st (after planting 20-25 days): soil, clean grass dressing combine 1, cultivate lightly.

- Stage 2 (after planting 40-45 days): soil, clean grass dressing combination was 2, cultivate lightly.

- Always keep the soil moist, appropriate humidity around 65-80%, If the yam having drought furrow irrigation is required (for the folding water ½ - 2/3 beds).

- Press the tip: after planting conducted approximately 25-30 days to enhance the growth and development of early stage leaves, enhanced accumulation of organic matter.

- Lift the wire to sever the roots to concentrate nutrients in tubers. Lift the cord should be conducted regularly, lift finished to put the old place did not turn cord, to avoid causing damage to the leaves.

- Regularly visit our timely detect pests to timely prevention measures.

Potato pests:

Adults are beetles, to close by red ants, 5-7 mm long, long head, reddish-brown sheen. Adults activities night and early morning, lay eggs in small holes in the wire and crawls under the soil crevices to lay eggs on potatoes.

Young Sung slightly longer, curved, milky white, legless abdomen chest and legs. Sung opaque in wire and tubers, especially those coming out of the ground tubers. Poor growth is perforated wire, place the victim becomes deformed, swell and crack. Turbid tubers rot, bitter inedible, bitter taste is caused by toxins produced potato to resist the damaging of devotees.

Prevention:

- After a few sweet potato crop rotations up with rice, vegetables and other colors.

- After harvesting potatoes wire the entire collection, especially the potato was taken out of the field devoted to curb destruction of bile at the start of next season worshipers.

- If there is water soaking conditions for a few days destroy fields cult, pupae in the soil.

- Soak cuttings before planting in Oncol 20EC infusion (30 ml / 10 liters of water) or Oncol 25WP (25 g / 10 liters of water) for 30 minutes, then drain and place the plant cuttings.

- At this stage of forming tubers, nuts sprinkled Lorsban 15G medicine (6-8 kg / ha) in combination with high potato Hillers, original cover. Watering after medication and regular watering sprinkle damp enough for potatoes. Notice of Non quarantine period is 21 days Lorsban 15G.

Harvesting:

When sweet potatoes stop growing manifestations (the original owner yellowing leaves, bark and roots dig inspection found a smooth, less plastic), to conduct the harvest. Harvest on a dry day, not hurt scrapes and peeling bark affect the design and reduce the value of the product.