"Flat stubble" is one of the important technical measures to cultivate high-quality Sophora japonica.

First, what is "flat stubble"

The so-called "leveling stubble" refers to that after transplanting Sophora japonica (including trees and shrubs) for 2 to 3 years, all the branches on it are cut off from the root neck, so that it can send out a straight and thick trunk again, and finally the height of its branch points is determined according to the needs of customers.

Second, the mechanism of "flat stubble"

After transplanting, Sophora japonica absorbs a lot of water and nutrients from the soil and transports them to branches and leaves. Its leaves make nutrients through photosynthesis, and in addition to their own consumption, they transport redundant nutrients to the roots and accumulate them. In winter, the nutrients accumulated in roots reach the maximum. Furthermore, the growing points of most plants have the biological characteristics of "apical dominance". After the stimulation of "flat stubble", the first adventitious bud at the upper end of the root neck grows linearly and reaches the highest point under the supply of a large amount of nutrients accumulated in the root. Therefore, within 2 to 3 years after transplanting Sophora japonica, the more nutrients accumulated in the roots, the faster and higher the trunk grows after "leveling stubble". Because it is "accumulated for several years and grows suddenly at a time", the trunk not only grows tall, but also is straight, which exceeds the height and straightness of Sophora japonica cultivated by conventional methods at the same time.

Third, the advantages of "flat stubble"

After "leveling stubble", the Sophora japonica is not only straight, but also strong. Roots and tillers rarely sprout in the rhizosphere and compete with them for nutrients. Due to vigorous growth and less pests and diseases, the quality of Sophora japonica has been greatly improved.

Fourth, the season of "flat stubble"

Practice shows that "stubble leveling" must be carried out during the dormant period of Sophora japonica, that is, after defoliation and before germination in the second year. Premature, once the upper adventitious buds germinate, they are vulnerable to freezing injury in winter; Too late, because nutrients have been transported upwards, the growth potential will be greatly weakened. Therefore, the "stubble leveling" work is best carried out in the current year 1 February or the following year1month.

V. How to "level stubble"

"Flat stubble" should be carried out with hand scissors or special olecranon scissors with good bite. Cut the root neck of Sophora japonica 2-3 cm from the ground, and the cut should be smooth to avoid tearing the phloem. It is also necessary to cut off the root tillers attached to the rhizosphere by hand to concentrate nutrients.

Six, "flat stubble" after the management

After "leveling stubble" of Sophora japonica, a large amount of fully decomposed cake fertilizer or human excrement and urine should be applied immediately, and part of chemical compound fertilizer can also be mixed. Then water it once. After watering, cover the stubbled Sophora japonica with straw to reduce water evaporation and play a cold-proof role. After that, water is poured once every half month, which not only ensures the water demand of the stubble seedlings, but also enables the fertilizer to be "dissolved" and absorbed by the roots.