Planting techniques of Greening seedlings

Green seedlings play an important role in landscaping, and once they are planted, they can improve the urban environment. What are the planting techniques of green seedlings?

1. Land selection and preparation

Green seedlings are suitable for planting in slightly acidic soil with deep, loose, moist and fertile soil and good drainage. At the same time, the conditions of drainage and irrigation should be good, the road is smooth, and tractors or trucks are feasible to facilitate the transportation of seedlings and materials. After selecting the land, it is appropriate to dig the soil deeply and apply 500jin cake fertilizer or 6000-7000 jin fence fertilizer plus 50 jin phosphate fertilizer per mu. Then dig a seedling bed width 110cm, footpath wide 30cm, deep 25cm, and dig a good perimeter groove and waist groove (wide 50cm, deep 50cm) to communicate with the drainage channel.

2. Seedling raising and planting

(1) the time of seedling emergence: from October to the end of March of the following year.

(2) Transportation: seedlings with soil balls can be placed on two floors when the soil balls are less than 30 centimeters. When the soil balls are big, the soil should be stabilized, and one tree should be arranged tightly. Transporting shrub seedlings and seedlings with soil balls below 1.5 meters in height can be loaded upright, but people or heavy objects shall not be placed on the soil balls.

(3) planting density: the plant spacing of the first planting row is generally 70cm*80cm (1100 plants / mu), in the shape of plum blossom or triangle. The row spacing of the second planting is generally 70cm*40cm, and the middle one is enlarged to 1.5 or 3 times the area in the second year.

(4) planting: generally planting bare root seedlings, when the tree species with adventitious roots are easy to grow in the root diameter, or when the planting site is a well-drained sandy loam, they can be planted deeper appropriately, and the rhizome (original soil mark) is 5-10 cm below the ground. Seedlings, shrubs or planting sites with soil balls should not be planted deeply in clayey soil with poor drainage, and the root diameter is slightly 2-3 cm below the ground or flat on the ground. For evergreen conifers and succulent root plants, the depth of the soil ball should not exceed 3. 5% of the thickness of the soil ball. When planted in areas with heavy stickiness and poor drainage, the top of the soil ball should be at least outside the topsoil layer, and the bare soil ball should be filled into soil bag after planting.

3. Field management

(1) Management before survival after planting: after the seedlings are planted, a soil enclosure with a height of 15-20 cm should be built around the tree hole, the inner diameter of the cofferdam and the diameter of the tree hole should be large, the cofferdam should be solid, and the bottom of the cofferdam should be flat, which should be used to block water when watering. It is a critical period from seedling planting to survival (after 2 weeks). We should pay attention to water management, pour enough fixed root water when planting, water again four days later, and then water every ten days, the so-called "three water" (except rainy days), clear ditches and drain stains on rainy days, and pay attention to cultivating soil, strengthening and compacting.

(2) Water and fertilizer management: it is necessary to keep the field soil moist after planting to facilitate the survival and growth of seedlings. Generally fine 10-15 days after the need to resist drought, can be flooded (can not spread over the surface of the seedling bed), watering and so on. Pay attention to clear ditches and discharge stains on cloudy and rainy days. Irrigation water should be clean and avoid polluting water sources. Fertilization can be started after the seedlings have been planted and have begun to grow. In the general growing period (April to August), fertilizer can be applied every 10-15 days, 5kg urea per mu, compound fertilizer 5kg per mu after autumn in the middle of August, and 50kg phosphate fertilizer per mu in mid-late September. After the beginning of winter, the application of farm manure (column fertilizer) of 3000 jin / mu between rows is very beneficial to the growth of seedlings in the coming year. Foliar fertilizer can be sprayed many times during growth (special foliar fertilizer, 0.2-0.3% potassium dihydrogen phosphate, urea all have good effect). Fertilizing should be sprinkled into the topsoil between rows (injury prevention seedlings), then loosen the soil and weed.

(3) Disease and pest control: more observation and control of diseases and insect pests. In order to control the ground tiger from April to June, we can spray acephate in the evening and kill 1000 times of the enemy. In September, we should pay attention to the control of mole cricket, grub and other underground pests. Poison bait and black light can be used to trap and kill. Pay attention to the prevention and control of foliar diseases and pests during the peak growth period. The wet soil in the field is easy to produce root rot and stem rot, so it is necessary to reduce the humidity, sun the field, and spray fungicide (didicarb).

(4) loosening soil and weeding: weeding should be "early, small, except". Weeds and barren seedlings should be strictly controlled in the first year, and combined with loose soil to improve soil structure, weeding and promote seedling growth. Generally, the soil should be loosened 1-2 times a month, with a depth of 3-5cm. For example, covering the seedbed with straw, straw or thatch is very beneficial to control weeds and keep the soil moist and loose.