Field management experience of sweet potato planted in June

Since the first ten days of June, the planting of summer sweet potato in Huaibei of our province has gradually ended and entered the period of field management, so the field management of sweet potato should be strengthened. Check seedlings and replenish seedlings within a week after planting sweet potatoes to ensure the whole seedling. When replenishing seedlings, strong seedlings should be selected and watered thoroughly, and eccentric fertilizer should be applied after survival to promote the seedlings to catch up with the big ones.

Ploughing and weeding in ploughing can break the soil surface crust, loosen the soil, enhance the soil permeability, and promote the rooting of potato seedlings. Cut off the soil capillaries after ploughing, so that the water in the lower layer of the soil is not easy to rise to the soil surface along the capillaries and reduce the evaporation of water. Therefore, mid-tillage can not only resist drought and preserve soil moisture, but also remove weeds. Intertillage is generally carried out for 2 or 3 times, the first time after returning seedlings, the second time at the branching stage, and the third time before the ridge closure. To hoe thoroughly, hoe evenly, do not miss the hoe, do not hurt the potato seedlings. At the same time, the third intertillage should be combined with gully soil cultivation to restore the ridge shape. Ditch soil cultivation should be careful not to damage potato seedlings and not to cover too much soil on the ridge surface, so as not to increase the soil thickness of sweet potato roots, which is disadvantageous to the growth of roots and the expansion of roots.

Topdressing should be carried out because of the seedlings and the ground.

The main results are as follows: (1) the rosette stage of fat sweet potato refers to the period when the main stem of sweet potato grows to about 35 cm and the basal leaf axil has branched. In this period, according to the application of base fertilizer and seedling condition, universal or partial application of available nitrogen fertilizer. Universal application is to use 4-5 kilograms of urea per mu and apply it in the middle of two trees. Partial application means less application of strong seedlings and more application of weak seedlings.

(2) foliar fertilizer spraying is generally used in the late growth stage of sweet potato, that is, 40-50 days before harvest. ① potassium dihydrogen phosphate solution is sprayed with 15000g potassium dihydrogen phosphate per mu and 75kg 100kg water per mu. ② sweet potato expander is sprayed with 10 grams of sweet potato expander and 75 kilograms of water per mu. The solution of ③ superphosphate is 2kg / mu of calcium superphosphate, 75kg / mu of water, stirred and dissolved, filtered and sprayed with a sprayer, and the effect is better after 4: 00 p. M. in sunny days.

Drought resistance and drainage for long-term drought should be irrigated in time, especially in the peak period of root expansion. When irrigating, the water depth should be up to the ridge height 1, 3, 1, 1, 2, and can also be irrigated through the ridge. the soil should be loosened in time with irrigation. Sweet potato is not resistant to waterlogging, so it should be drained in time according to the condition of stagnant water in the field.

Lift the vine gently from the ground, break the adventitious root and place it in the same place. It does not have to be carried out under normal conditions. However, when the potato vines are silted in the soil after rain, the vines can be ventilated, dissipate moisture and facilitate drainage. For the fields with much fertilizer and water and overgrowth, the vine can cut off the adventitious roots, reduce the ability to absorb fertilizer and water, and restrain the overgrowth. If there is a trend of overgrowth, measures such as coring, lifting vines, cutting off old leaves and so on will have a certain inhibitory effect. People in many areas have the habit of turning vines in the later stage of sweet potato growth. After a large number of experiments, it is proved that the more times of vine turning, the greater the reduction of yield. therefore, except for the early field management measures such as fertilization, ploughing, soil cultivation, ditch drainage and so on, generally do not turn the vine.