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This is because the peak period of high growth and rapid growth of full-term growth seedlings and the peak period of rapid growth of roots are staggered. In the early stage of seedling stage, root growth is faster than height growth. In order to improve the high growth of seedlings, topdressing should be carried out early for spring growing trees. If the topdressing period is delayed to may or even after June, the high growth has ended, and topdressing has no effect on the high growth.

The requirements of root growth on environmental conditions, in addition to temperature, 2 gallon pots soil moisture and nutrients, some tree seedlings also require ventilation conditions. In order to prevent secondary growth, irrigation and nitrogen application should be stopped in time after the fast-growing period. The root system can absorb more water and various nutrients, and the aboveground part can produce a lot of carbohydrates. The length of fast-growing period and the time of coming have a direct impact on the growth of seedlings.

The same tree species or varieties have different environmental conditions. In addition, the duration will change due to different conditions such as the morning and evening of sowing date, whether to promote germination or not, the thickness of soil cover, and soil moisture and temperature. The initial growth period of full-term growth seedlings lasted from 1 month to 2 months. Due to the sensitivity to fertilizer and water at the initial stage of growth, the ammonia nitrogen in the soil in early spring in North China is often insufficient, so nitrogen fertilizer should be applied early.

Its duration is 1.5-2.5 months for northern species and about 3-4 months for southern species. In the fast-growing stage, there are two growth peaks, and a few have three growth peaks. The survival period is from the insertion of damaged panicles into the soil to the rooting of the lower part of the cuttings, the stable insertion of deciduous trees, the upper end of leaves, the independent nutrition of newborn seedlings, and the adventitious roots of evergreen trees.

The hardening period of seedlings in China starts from the time when the height growth of seedlings decreases significantly (in spring, the growth type seedlings start after the peak of rapid growth in diameter) to the end of both seedling diameter and root growth. The 3 gallon pots shall be moistened with sand for about 10 cm, and then covered with soil to make the item shaped like a ridge for drainage. The thickness of upper soil cover shall be based on the principle of controlling the temperature required for germination.

The growth of cutting bacteria in the fast-growing period showed the characteristics of two growth types in the same year. For example, for full-term growth trees, the fast-growing period in the north is from June to August (a few to September), and from the south to around September to October. Whether the sowing time is appropriate or not has a significant impact on seedling quality and qualified seedling yield. In short, on the premise that the seedlings will not suffer from low temperature damage after being unearthed, it is better to be early.

In the year of transplantation, it showed the growth characteristics of two growth types. The survival period of transplanted seedlings starts from the time of transplantation to the time when the aboveground part of the seedlings begins to grow and the underground root system recovers its absorption function. Forced dormant seeds, such as Pinus, Yunyi, Abies and larch, also significantly improved the field solid germination rate and seedling growth after low-temperature stratification.

The temperature of variable temperature stratification is high temperature (15 ℃ ~ 25 ℃) and then low temperature (0 ℃ ~ 5 ℃). Generally, the high temperature time is short and the low temperature time is long. However, the high and low temperature periods of some tree species are almost the same, such as Fraxinus mandshurica, which is three months. In order to drain the 7 gallon pots, a drainage ditch with a width of 20 cm and a depth of 20 cm shall be dug at the bottom of the ditch along the length of the ditch. The bottom of the ditch shall be placed with river pebbles or light wood, with a thickness of about 10-20 cm, and wooden boards or forest oranges shall be placed on it for drainage.

The principle of low temperature stratification is that the reason for the good effect of low temperature stratification is the influence of comprehensive factors. In particular, it has a significant effect on the seeds that form physiological dormancy due to the presence of germination inhibitors. The roots are the least, the roots are underdeveloped, and the top buds of coniferous seedlings are weak; Seedlings are prone to diseases and insect pests, seedlings are seriously differentiated, and the number of qualified seedlings is small: seedlings have weak stress resistance and low afforestation survival rate.

To prevent frostbite, we also need to keep the shed film clean, increase the transparency of the film, increase the light and improve the temperature in the shed. The watering shall be thorough, but there shall be no ponding. Generally, newly bought plants are not watered immediately. If it needs to change pots, it needs to be watered once with dry new soil. Generally, plants just bought home should not be watered immediately. They need to be watered after they adapt to the environment.

How to raise light in winter? Primroses like the sun, but they are afraid of being directly exposed to the strong sun, and the light in winter is very mild. Therefore, we need to let primroses receive more light in winter without worrying about being sunburned by the sun. In this way, primroses can better accumulate nutrients, lay a good foundation for flowering, and maintain temperature at the same time(5 gallon pot). More water can be poured in the spring and summer growing season to wet the soil. Control water at high temperature.

Greenhouse vegetables should pay attention to ventilation and seedling refining. They should be uncovered late and covered early. They should be ventilated for a period of time around noon to discharge ammonia and other harmful gases out of the greenhouse in time. When it is cloudy and rainy, cloudy and sunny, or sunny after snowfall, the plastic film should not be removed all at once, but part of it should be removed, so that the plants can slowly adapt to the environment, which is conducive to the healthy growth of vegetables. Reduce water volume after cooling in autumn and stop water in winter.

In daily maintenance, the most water is poured in summer, and it should be poured every 3-4 days. It's cold in winter. You can water it once a month. Water it every ten days in spring and autumn. Don't be too dry or too wet. Watering once a week in the peak growth season can shorten the time and water more frequently for open-air breeding. Proper water control is required in summer and winter, and there shall be no ponding in the basin soil. It is usually watered once every two or three days.

Spray water frequently to maintain humidity during high temperature in summer, control water during pregnancy and bud, and it is best to put it in a cool and ventilated place. When watering, pour it on the soil from the side, not on the plant(1 gallon pot). The water evaporates quickly in summer, so it is necessary to increase the number of times and spray water frequently. Water should be controlled in winter. It is best to keep the soil slightly dry to avoid ponding. Note that the water temperature should be close to the room temperature to avoid damaging the root system.

When watering, just slowly penetrate from the edge of the flowerpot until there is water flowing out from the bottom. Once every two or three days in spring and slow growth in summer. Reduce the frequency once every three or five days. The temperature is suitable in autumn. It's best to water it every day. In winter, it is mainly to control the temperature. If the soil turns white, just water it again. Pay attention to pouring thoroughly every time, and do not accumulate water. Water should be poured from the edge of the soil to allow the water to penetrate slowly.

If it is just planted in a basin, a small amount of water is OK, and the soil is slightly wet. If you just bought it home, you can't adapt to the new environment, and you can't supply a lot of water. If the soil isn't dry, you won't water it. Usually, water it once a week, on the soil, not directly from the plant. Especially in the spring growing season, water it every other day, and pay attention to watering it thoroughly every time. Infiltrate water from the edge of the flowerpot at the bottom of the plant until the bottom flows.

If the pot is new, it should be watered as soon as possible, so that it can adapt to the new environment faster. Among them, the water consumed in spring and summer is much, so it should be watered frequently(15 gallon nursery pots wholesale). The growth is slow in autumn and winter, so we should control the water. Be careful not to accumulate water, and the water temperature should be close to the room temperature. When watering, pour it from the bottom of the plant to let the water completely penetrate into it. If it's spring, once a half month. It grows vigorously in summer and consumes more water once every ten days.

Water should be controlled in autumn and winter. If the soil is not dry, it should not be watered and kept dry. If it is just planted in a pot, it should be watered thoroughly to fix the root and promote faster adaptation. Don't rush to water those just bought home. Just water them when the soil is dry. During the management period, pay attention to the amount of watering. Several times can be watered thoroughly. Pay attention not to ponding, and more ventilation is required after watering. If the potted plant has just been put into the pot, it can be watered thoroughly.

Don't rush to water the small plants just bought home, otherwise they can't adapt to the new environment and will affect the recovery. The specific frequency depends on the season. In spring and autumn, it should be poured in the morning. It is OK to use the dip basin method or slowly penetrate from the base. It should be poured thoroughly. It should be poured in the evening in summer and at noon in winter. The water temperature should be close to the soil temperature to avoid water injury. The normal frequency is once every 3-7 days. Control water in winter.

If the soil is white and dry, it should be watered through as soon as possible. When watering, permeate water from the bottom of the plant, and pay attention not to have ponding. If the soil is slightly wet, do not water it to avoid ponding and rotten roots. If you just bought a small plant and the soil is wet, just ventilate more, and then manage it normally after it recovers its growth(plastic garden pots). Pay attention to pouring on the soil when pouring, and the bottom of the flowerpot should exude water.

If it is managed by land planting, it is necessary to replenish water frequently in spring, summer and autumn to make the soil moist, but do not accumulate water, so as to absorb enough water and promote growth. Reduce the number of times in winter. Just leave the soil dry. Generally, the growth season in spring and autumn is once every 7-10 days. The high temperature in summer is good, and the water should be controlled when it is low in winter. If it is not dry, it will not be watered. When pouring, just pour it slowly from the edge of the flowerpot, not on the plant. Also note that the water temperature should be close to the room temperature.