Cultivation techniques of Yellow Poplar

Buxus tree on the soil requirements are not strict, sandy soil, loam, brown soil can be planted, but the best is rich in organic matter loam. When preparing the land, the land type is required to be flat. Combined with deep ploughing, plus organic fertilizer, about 2000 kg per mu. When applying base fertilizer, it should be noted that organic fertilizer must be fully decomposed and deeply applied in planting holes. Planting time in Beijing area under the climatic conditions, planting seedlings in spring mainly, generally in early April "Qingming" two or three days before the appropriate. Boxwood open field planting general plant spacing: 0. 5×1. 5 or 0. 4×1. 2 meters, planting about 1000~1500 plants per mu.

As the age increases, seedlings can be raised from separate plants later. Buxus seedlings can be planted in holes or furrows. Before planting seedlings, according to the planned row spacing, line fixed points, dig holes according to points or ditch according to planting row spacing. The ditch depth should be greater than the seedling root depth, about 40 cm deep. Before planting, apply base fertilizer deeply, mix fully decomposed organic fertilizer with soil, and apply it to the bottom of the hole. When planting, the seedlings are removed from the nutrient bowl, arranged in the ditch according to the plant spacing, so that the roots contact the soil, and the soil is filled. When stepping on soil after covering, do not crush the soil ball, but step on the gap between the soil ball and the tree hole. Cover soil depth slightly deeper than the original soil print, so as to avoid soil sinking after irrigation and exposing roots, affecting survival.

watering

Watering is the main measure to ensure the survival of seedlings, especially in northern spring drought, less rain, evaporation, if insufficient water supply, will seriously affect the survival rate of seedlings. After planting seedlings, ridging can be done every 4 to 6 rows to facilitate irrigation. It is required to irrigate the first time within 24 hours after planting, irrigate the second time every 3 to 5 days, and irrigate the third time every 5 to 7 days. After irrigating the three times, it can be decided whether to irrigate according to the weather and seedling conditions.

Water can not be too large or too small, water is too large, the soil becomes soft, seedlings are easy to lodge; water is too small, affecting survival. Planting seedlings after irrigation or more rainfall, seedlings easy to lodging, tilt or exposed roots, such as this phenomenon, should immediately straighten, cultivate soil, tread solid, otherwise because seedlings are germinating growth, seedlings will bend within a few days. When supporting seedlings, you can dig up the soil near the seedling roots first, straighten the seedlings, find the direction between straight rows and plants, and then return the soil to be solid. After planting seedlings after three consecutive irrigation, seedbed soil subsidence and potholes, should be carried out in a timely manner leveling, filling. Can also be combined with intertillage will be flat ground, so that seedlings by the water consistent, to prevent uneven drought and flood. Buxus more like water, in watering should master the "wet rather than dry" principle.

In seedling stage, the root system is shallow and sensitive to moisture. Generally, it is necessary to keep the surface soil moist and irrigate it a few times. During the fast-growing period of seedlings, rapid growth, water demand, should be large water irrigation, so that there are wet and dry, full irrigation. But in the late growth period, in order to prevent excessive growth of seedlings and promote lignification, irrigation should be stopped. Generally, watering should be controlled at the end of summer. Irrigation time: the time of each watering, preferably in the morning and evening, not in the highest temperature at noon.

intertilled weeding

Intertillage weeding is a regular job in seedling management. Cultivation and weeding are two concepts, but they can be combined.

General intertillage weeding is best carried out after rain or irrigation. When the soil is wet, the grass is uprooted and the loosening effect is also good. Seedling newly planted soon, most of the soil surface exposed to the air, not only the soil is very dry, but also easy to grow weeds, during this period should be timely intertillage weeding, in order to promote seedling root development.

Generally, the seedlings should be slightly tilled near the roots, and the rows between plants can be deepened appropriately, usually 3 to 5 cm. Intertillage in rainy season promotes gas exchange and evaporation of gaseous water, which can prevent seedlings from waterlogging. In northern China, it is generally dry in spring and weeds have stopped growing in autumn. In these two periods, cultivation should be given priority, and weeding should be given priority in summer. Weeds fast-growing period is around the rainy season, this period should strengthen weeding, weeding should adhere to the principle of early, small, except. Perennial weeds must be dug up completely underground, otherwise, it will be more and more difficult to remove.

topdressing

Topdressing can timely supplement a large number of nutrients required by seedlings in the period of vigorous growth and development, promote the growth and development of seedlings, and improve their quality. Buxus trees need more phosphorus at seedling stage, more nitrogen at peak growth season, and more potassium at the end of autumn.

After seedling planting, foliar spray 0. 4% potassium dihydrogen phosphate solution should be carried out on cloudy days or when the air is humid in the morning and evening. Generally three to four times a month foliar spray potassium dihydrogen phosphate can be. Newly transplanted boxwood seedlings should be fertilized in the early stage, but it should be noted that the fertilizer concentration should not be too large, so as not to burn new roots. In the seedling fast-growing period, should increase the amount of fertilizer and increase the frequency of fertilization, not less than once a month, topdressing nitrogen fertilizer can be urea, dry and wet application of two methods.

Dry application can be spread and furrow application. The fertilizer is evenly spread on the soil between seedlings, and after application, it is shallowly hoed for 1~2 times and covered with soil. The furrow application is to ditch between seedlings, generally 15~ 20cm away from the root of seedlings, and then apply the fertilizer into the ditch, and then cover the soil. When furrow application, attention should be paid to the depth of furrow should be in the distribution layer of roots, so as to facilitate the absorption of fertilizer by seedlings. Wet application is to dissolve fertilizer in water, fully sprinkle on the seedbed or between rows, it is best to irrigate again after application to avoid burning damage. Nitrogen fertilizer should be applied in spring and summer, and the last nitrogen fertilizer application should not be later than "early autumn". To prevent excessive growth of seedlings, reduce the ability of Buxus seedlings to winter. From August to September, nitrogen fertilizer must be stopped, and phosphorus and potassium fertilizer should be the main fertilizers. Promote the lignification and root growth of Buxus seedlings, improve the cold resistance of seedlings.