Detailed Explanation of Litsea cubeba Cultivation Techniques and Key Points of Planting Management

I. Propagation Methods

1. Seed propagation

(1) Collecting seeds Litsea cubeba is propagated by seed. When selecting seeds, choose mother trees that are healthy and in their full fruiting period, and collect the seeds when most of the fruits have turned black. A plastic sheet can be spread on the ground to collect them. First pile the seeds for 4 to 5 days, and after the fruit skins rot, peel and wash the fruits, or put the fruits into a bamboo basket, first place them in water, remove the impurities and shriveled seeds floating on the water surface, then rub them repeatedly to separate the fruit skins from the seeds, wash them with water, and remove the fruit skins to obtain the seeds.

(2) Sowing After cleaning, select good seeds, dry them in the shade, and then sow them. If short-term storage is needed due to autumn drought, wet sand storage can be used. The seed germination rate declines as the storage period lengthens. If sowing is postponed to the second year, the germination rate drops noticeably and germination is also uneven. Therefore, sowing should be done from late August to the end of September. For sowing and raising seedlings, choose sandy loam with good drainage and irrigation conditions, plow deeply, harrow and break up the soil, level it, and make raised beds 1 m wide and 20 cm high, open horizontal furrows, apply base fertilizer, with a furrow spacing of 30 to 40 cm and a depth of 5 to 6 cm. Evenly sow the sand-stored seeds in the furrows at a sowing rate of 20 to 25 kg per mu, cover with 2 to 3 cm of soil, and cover with grass, removing it promptly when most seedlings emerge. Half a month after the seedlings emerge, apply 1 application of dilute human and livestock manure water, first thin and then concentrated, with a total of 2 to 3 topdressings, and irrigate promptly, shallowly cultivate, weed, and thin the seedlings. After 1 to 2 years of cultivation, when the seedlings are 60 to 70 cm tall, they can be lifted from the nursery for field planting.

2. Cutting propagation One-year-old branches can be used for cutting propagation.

II. Site Selection and Land Preparation

For selecting forest land, choose sunny slopes, higher altitudes, thick soil layers, good drainage, and loose-structured yellow-red soil or mountain brown earth, with a pH of 4.5 to 6. For low hills and gentle slopes, a tractor can be used for full reclamation and land preparation or strip reclamation, with deep plowing of 30 to 40 cm. For mountain land with a relatively steep slope, contour-line cross-slope land preparation can be adopted, with deep plowing of 25 to 30 cm.

III. Establishing an Economic Forest

1. Field planting The best transplanting time is after leaf fall in early spring or late autumn. Water thoroughly 1 to 2 days before digging up the seedlings. After lifting the seedlings, prune broken and residual roots, and keep soil around the roots or coat the roots with mud slurry. According to a row spacing of 3 m x 2 m, dig large holes with a diameter of 50 cm and a depth of 40 cm. Litsea cubeba is dioecious, and the part used is the fruit. To ensure an appropriate ratio of pollinator trees to fruiting trees per unit area, in eastern Sichuan it is common to plant 3 trees per hole arranged in a “pin” shape, so that after entering the flowering period female and male plants can be appropriately selected. Do not plant the seedlings too deeply; set them at 3 to 4 cm above the root collar, cover with soil and firm it, and water thoroughly to settle the roots.

2. Seed sowing Direct seeding for forest establishment is possible. It is best to sow as soon as the seeds are collected, for no more than 5 days at most. The holes should be 30 cm wide and 15 cm deep, with 6 to 8 seeds sown per hole and covered with 2 cm of soil. The seedlings emerge the following spring. Half a month after emergence, weed and loosen the soil, and in July to August carry out another round of soil loosening and weeding.