Key points of cultivation techniques of Spring Potato in Open Field

Potato nutrition rich, high yield, storage resistance, long listing cycle, can be used as vegetables can also be used as food, deeply loved by consumers. Potato spring open field cultivation is the most common way of cultivation, almost every farmer to plant. To seize the high quality and high yield of open field spring potato, we should first select improved varieties. Potato seeds must be selected from the north transferred "Dongnong 303""Kexin No. 4" and other original seeds, can not use self-retained seeds, not to mention planted for many years, varieties aging, species seriously degraded local species. "Dongnong 303" and "Kexin 4" showed high quality, high yield and early maturity after many years of planting. The yield per mu can reach 1500~2000 kg. The seed amount per mu is about 150 kg. The large potato can be cut and sown. Each seed potato weighs 20~25 g and has 2~3 bud eyes. Due to the complex source of potato seed potatoes, farmers should go to regular agricultural materials stores to buy.

Second, seed at the right time. Timely sowing is one of the key technical measures to obtain high quality and high yield of potato. According to the growth characteristics of potato and local climatic conditions, the best sowing time of potato in spring open field cultivation is between the beginning of spring and rain, that is, mid-February. With the elevation of latitude and altitude, the sowing date can be postponed appropriately. If sowing too early, it is easy to suffer from late frost and late spring cold in late March and early April after emergence, resulting in freezing of stems and leaves, resulting in yield reduction; sowing too late, although freezing injury can be avoided, but due to the shortened vegetative growth period, the temperature rises in the later stage of growth, which is unfavorable for tuber expansion, the purpose of high quality and high yield cannot be achieved.

Third, it is necessary to apply sufficient base fertilizer. Potatoes advocate one-time application of sufficient fertilizer. When ploughing, 50kg of 45% sulfur-containing ternary compound fertilizer should be applied to each mu, and chlorine-containing chemical fertilizer should not be applied to avoid affecting the quality. After ploughing, make a ridge and open a hole to sow seeds. The hole should be opened wider and deeper. First, 10 loads of concentrated human excrement are used to point the acupoints, then a handful of livestock manure is applied, covered with a layer of soil, and then seed potatoes are added to avoid direct contact between seed potatoes and fertilizer to affect seedling emergence. The amount of farm manure per mu is more than 1000 kg, and excess fertilizer can be applied to the soil after furrowing between rows, so that fertilizer can be continuously supplied without topdressing later. Sowing density is generally 5500~6000 cultivated per mu.

Fourth, chemical weeding. In order to prevent weeds damage, you can use 50% acetochlor 100 ml water to spray the whole field after sowing and soil restoration. Pay attention to the requirement that the soil is moist and the field surface is flat to improve the weeding effect.

Fifth, it is chemical regulation. Using paclobutrazol to control excessive growth and promote short growth, spraying 30ml of uniconazole evenly with 50kg of water from the beginning of flowering to the full flowering stage of potato can effectively prevent excessive growth, reduce disease and increase yield. Generally, it can increase production by more than 10%.

6. Prevention and treatment of diseases and insects. The main disease of potato during growth period is late blight. When another star disease plant is found, it should be removed in time, and then the whole field should be controlled by spraying 800 times of 25% Ruidumei. The main pests are 28 star ladybug and aphid. When it occurs, 80% dichlorvos 500 times and 10% imidacloprid 1500 times can be used to control it.