Nutrient consumption of asparagus mother branch key points of asparagus management during summer harvest shutdown period

Asparagus was formed from the mother stem and consumed a lot of nutrients after more than 3 months of harvest in spring. at this time, the assimilation intensity of the branches and leaves of the mother stem was very low, but the respiration of asparagus was very exuberant because of high temperature. It is necessary to stop harvesting and strengthen management, with emphasis on water and fertilizer management, so that plants can be recuperated and grow back quickly, so as to lay a foundation for the high yield of asparagus in autumn.

Asparagus management

1. Clear the garden. After stopping the harvest of asparagus, ploughing and weeding in time, 150-200 kg lime powder was applied to disinfect the asparagus garden and its surroundings. At this time, all the tender stems of asparagus should be preserved and allowed to grow and form branches and leaves. When the new mother stem is formed, the mother stem left in spring is gradually cut off according to the degree of senescence, and then moved out of the field and burned.

2. Fertilizer and water management. The summer harvest of asparagus in the southern coastal area is only about 40 days, and the autumn harvest of asparagus is carried out before and after "White Dew". Therefore, in order to quickly restore the growth of asparagus after spring harvest, we should immediately open ditches and apply rejuvenation fertilizer because of the short period. In addition to applying sufficient organic fertilizer according to the requirements of winter, it is also necessary to increase the application of available fertilizer to promote the growth of tender stems. 1500-2000 kg of rotten soil fertilizer, 15 kg of urea, 25 kg of superphosphate and 10 kg of potassium chloride were applied per mu of asparagus. In case of drought, increase the number of watering, about 10-15 days, combined with fertilization, watering once, so it coincides with the rainy season, timely drainage after heavy rain.

3. Choose the mother stem. The mother stem should be reserved 15 days before asparagus harvest, and the asparagus plant with a diameter of 1-5cm, robust and disease-free should be selected as the mother stem. The selected mother stem should be fully separated and reasonably distributed. In the first year, 2-3 plants were left in each clump, and 3-4 plants were left in each clump in the aged bamboo shoot garden, and the rest were cut off to reduce nutrient consumption. After the mother stem is selected, reinforce the strut to prevent lodging. When the young stem of asparagus grows to 70-80cm, the young heart of 3-4cm at the top of the young stem should be removed in time to prevent it from being too high. After removing the heart, spray in time.

4. Pest control. Asparagus orchards with stem blight and other diseases in spring can be prevented by using fungicides with internal absorption or infiltration, such as bacillus, metalaxyl and zinc to irrigate asparagus. During the period from the unearthing of the tender stem of asparagus to the formation of the new mother stem, spraying prevention should be strengthened. During the elongation of the tender stem, the medicament can be applied to the stem. After the branching occurs, it should be sprayed once every 5-7 days until the stem and leaf tissue is aged. At the same time, combined with extra-root topdressing. In addition, it is the peak period of Spodoptera litura at this time, so it is necessary to spray in time to control and kill its larvae.