Pre-plant preparation
(b) land selection and consolidation: the choice of estuarine, well-drained sandy or bordered soil, ph values 5. 5-7. 0 are desirable and associated (with an interval of 2-3 years). 30-40 cm deep tillage, 2000-3000 kg + 3-dollar compound fertilizer (15-15) 50 kg per acre, flat as high as 20-30 cm high, 1. 2-1. 5 m wide, 30 cm drainage ditch。
Potato selection and treatment: no disease, no damage, 50-100g single weight, full seed. One or two days before seeding, 50% polybacterium immersed with 500 times the fluid 15 minutes of disinfection, drying and awaiting broadcast。
Seeding techniques
Time: the daily temperature is stable to sow at 15°c or more (south 3-4, north 4-5)。
Method: 25-30 cm range, 50-60 cm range, cave depth 8-10 cm depth, seeding of tarp up, 5-6 cm top, covering membrane humid warming。
Ii. Plumbing period (from 3 to 4 saplings, approximately 30 to 40 days)
Temperature management
Temperature is maintained at 18 - 25°c and membrane cover is required to vent the membrane to avoid high temperature burning seedlings; soil moisture is maintained at 60 - 70% and water is slightly watered during drying and protected from water。
2. Field management
Saplings and replanting: post-sapling screening, timely removal of weak, ill seedlings and replanting of strong seedlings where seedlings are lacking。
Weeding in china: 1 - 2 times during the nursery period, break the sheeting, combine weeding and avoid the roots。
Fertilizers: 10-15 cm per acre of urea 10-15 kg + 1000 kg of decomposed and rare faeces, promoting the growth of the leaves。
High and long-term (four real leaves to tubers starting to expand, approximately 50-60 days)
Watering: this phase requires heavy water, soil moisture (70-80 per cent humidity), water at high temperatures at evenings, and the timely discharge of the rainy season against the roots。
Fat hunt: 2 points to fat chase:
1st (5-6 leaf): 3-dollar compound fertilizer (10-10-20) 20-30kg + potassium sulphate 10kg per acre, promoting tuber multiplication。
Second (7-8 leaf): 50-100 kg + 3d complex (15-5-20) 30 kg per acre of corroded corrosive corrosive fat, which expands the stock of nutrients for the tubers。
Plantation management
(b) peasant: in the medium-growth period (6-7 leafs) two to three periods, 5 to 8 cm each, to prevent the lumbers from becoming green and to promote the growth of non-stable roots。
Extracting side buds: timely elimination of lumbering and reduction of nutrient consumption。
Water fertilisation regulation
Water control: gradual reduction of water irrigation in the later stages of expansion, cessation of water irrigation 10-15 days before harvest, increase of starch content and ease of storage。
Fertilizer pursuit: 0. 2% potassium dihydrophosphate sprayed on the leaf + 0. 5% urea solution 2-3 times to promote tubing。
2. Pest management
Main diseases: epidemic disease (72% frosting manganese zinc 600 times fluid), soft decomposition (72% agricultural sulphate cythin 400 times fluid)。
Main pests: slashed night moths, aphids (10% chlorocypermethrin 1500 times the fluid), ground pests (tiggers, tigers, 50% thionate emulsion 1000 times the root)。
The timing of harvesting
When 80% of the leaves are planted, when the yellows and the soil around the troughs, most of the south is in september-october, and the north needs to collect them before the frost falls, so as not to freeze them。
Harvest and storage
Pick the sun to dig, keep the soil around the tuber, avoid damage to the skin, cut off the leaf and dry it for 1-2 days。
Stored in ventilated drying, temperature 10-15°c, humidity 80-85%, stacked or loaded in baskets, with paddy mats at the bottom resistant to aroma。
