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Detailed Explanation of the Winter Trunk-Cutting Planting Method for Black Locust

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Planting black locust by trunk cutting in late autumn and early winter has several major advantages: First, it avoids the spring tree-planting peak and the busy farming season, making full use of the winter slack period, so that planting time and quality are fully guaranteed. Second, according to the physiological characteristics of black locust, the average daily temperature required for root growth is relatively low; after leaf fall in autumn the above-ground part stops growing while the underground part continues to grow for a period, and when the leaves fall the mobile nutrients in the branches and leaves return to the trunk and roots, at which time the roots are rich in stored nutrients, which precisely gives the root system a stage for growth. Third, the plots where black locust is planted are generally

Planting black locust by trunk cutting in late autumn and early winter has several major advantages: First, it avoids the spring tree-planting peak and the busy farming season, making full use of the winter slack period, so that planting time and quality are fully guaranteed. Second, according to the physiological characteristics of black locust, the average daily temperature required for root growth is relatively low; after leaf fall in autumn the above-ground part stops growing while the underground part continues to grow for a period, and when the leaves fall the mobile nutrients in the branches and leaves return to the trunk and roots, at which time the roots are rich in stored nutrients, which precisely gives the root system a stage for growth. Third, the plots where black locust is planted are generally relatively dry; late autumn and early winter come right after the rainy season, and the soil moisture is better than in spring, so planting at this time is more conducive to root growth, thereby increasing the planting survival rate. For newly planted black locust seedlings, before the severe winter arrives, the root system has already recovered and grown for a period; the following spring the seedling-recovery period is short, and once the temperature is suitable the roots grow immediately, then sprout from the root crown to form new branches.

I. Planting time: plant as soon as possible after all the leaves have fallen, in November each year.

II. Seedling size specifications: for afforestation on barren hills, generally choose seedlings with a ground diameter above 0.7 cm; for greening around the four sides, large seedlings with a ground diameter above 2 cm may be chosen. A complete root system must be retained, with root length not less than 25 cm and root spread not less than 20 cm.

III. Planting technique: autumn and winter planting generally adopts the method of digging and planting at the same time. When digging the hole, place the topsoil from the upper layer and the raw soil from the lower layer separately. Before planting, trim the roots well and cut off rotten and split roots. The planting depth should be the same as or slightly deeper than the seedling's original burial depth. When backfilling soil, first backfill the topsoil, then the raw soil, following the rule of "three burials, two treadings, one lifting of the seedling." Trunk cutting can be done immediately or 10 days after planting (this allows part of the sap in the seedling trunk to return to the roots, which benefits root growth), with the cutting height 2-3 cm above the ground. After trunk cutting, build up a mound of soil to cover it well.

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