What season is it better to fertilize tree seedlings

The specific application time of fertilizer should depend on the growth of trees and the season, and the production is generally divided into base fertilizer and top dressing.

(1) The application period of basal fertilizerBasal fertilizer is divided into autumn application and spring application. Autumn application is best applied before and after the autumn equinox, when the root system is at another peak of growth, and it is easy to heal after the root is injured, and new roots can be generated; Organic matter also takes longer to decay and decompose, which can provide nutrients for tree growth in the following year. Spring application of basal fertilizer, if the organic matter is not fully decomposed, the fertilizer effect is slow, early spring can not supply the root system to absorb, to the late growth of the fertilizer effect to play a role, often cause the secondary growth of new shoots, especially the growth and development of the tree is not conducive to the flower bud differentiation and fruit development.

(2) The application period of top dressingWhen trees need fertilizer urgently, fertilizer must be supplemented in time to meet the needs of tree growth and development. The specific topdressing time is related to the tree species, variety habits and climate, age, use, etc., and it is necessary to carry out topdressing strictly according to the characteristics of each growth period, such as the topdressing of flowering and fruiting trees, the flower bud differentiation period and the topdressing after flowering is more important. For most garden trees, topdressing during the peak growing season of the year is essential.

The number of topdressing, for the flowering trees, shade trees, street trees and key ornamental tree species within 2 to 3 years of initial planting, it is necessary to carry out topdressing 1 2 times a year during the growth period. As for the specific period, it must be reasonably arranged and flexibly grasped according to the situation. When the tree has symptoms of fertilizer deficiency, top dressing can be carried out at any time.

Arbor seedling fertilization is divided into basal fertilizer and top dressing, basal fertilizer is generally divided into autumn application and spring application, top dressing according to the situation of arbor seedlings in time top dressing, supplemental nutrition.

There are five periods of fertilization for fruit trees.

1. Autumn base fertilizer: This period is the third growth peak of fruit trees, which is generally carried out in October, with comprehensive nutrient requirements and can provide nutrients evenly and for a long time.

2. Germination fertilizer, pre-flowering fertilizer: 2-4 weeks before germination, this period is the first growth peak of the root system of fruit trees, the tree body mainly consumes stored nutrients, and the fast-acting nitrogen fertilizer is the main fertilizer, which can improve the fruit setting rate and the uniformity of the branches.

3. Fruit-preserving fertilizer, flower bud fertilizer: used when the new shoots stop growing, usually in early June, nitrogen, phosphorus, potassium, and micro-supplementation.

4. Fruit expansion fertilizer: the fruit expands rapidly, and the new shoot growth stops when it is used, this period is the second growth peak of the fruit tree, which is generally carried out in July; The purpose is to enrich the new shoots, promote fruit expansion, improve fruit quality, and promote the continuous differentiation of flower buds.

5. Post-harvest fertilizer, yang fertilizer: the fruit is used after harvesting, mainly nitrogen fertilizer, and phosphorus and potassium fertilizer.

There is a proverb in agriculture, "Autumn fertilizer is gold, winter fertilizer is copper, and spring fertilizer is rotten iron." "Autumn is the best time of year to apply fertilizer.

The fertilization period is also different for different trees. Generally, fertilizer is applied once every half month, and fertilizer needs to be applied during the peak growing season and the flowering and fruiting period. Try to avoid rainy days and dry soil fertilization.

1. In North China, a small amount of many times, as little as possible concentrated fertilization, in the growth period of 3-9 months each watering fertilization is better. If the province is labor-intensive, it will focus on fertilization in spring and summer, and pay attention to less fertilization or no fertilization in autumn. Excessive fertilization can easily lead to frost damage to plants.

2. Fertilization should be applied when the weather is sunny and the soil is dry. On rainy days, due to the slow absorption of water by tree roots, not only is it difficult to absorb nutrients, but also the fertilizer will be washed away by rain, resulting in waste.

Matters to be paid attention to in the fertilization of garden trees:

1. Because the roots of the tree are widely distributed, and the nutrients and water absorbed are all in the fibrous roots, therefore, fertilization should be around the roots, not close to the trunk.

2. Trees with strong root system and far-reaching distribution should be fertilized deeply and widely, such as Pinus tabuliformis, Ginkgo, A. chinensis, Acacia and other trees with shallow root system should be fertilized shallowly and the range should be small, such as tung tree, purple locust and flowering shrubs.

3. Organic fertilizer should be fully fermented and decomposed, raw manure should not be used, and the concentration should be diluted, and the fertilizer must be completely crushed into powder, and should not be applied in blocks.

4. After fertilization, especially after chasing fertilizer, it is necessary to irrigate the fertilizer in time and appropriately, so that the fertilizer can penetrate into the soil.

5. Fertilization should be applied when the weather is sunny and the soil is dry. On rainy days, due to the slow absorption of water by tree roots, not only is it difficult to absorb nutrients, but also the fertilizer will be washed away by rain, resulting in waste.

6. Sandy land, slope land and rock are easy to cause nutrient loss, so fertilization should be deeper.

7. Nitrogen fertilizer has strong mobility in the soil, so shallow application penetrates into the root distribution layer, and is absorbed by trees The mobility of potassium fertilizer is poor, and the mobility of phosphate fertilizer is worse, so it should be applied deep to the place where the root system is distributed the most.

8. The basal fertilizer should be applied deeply because of the slow fertilizer effect, and the top dressing fertilizer effect is faster, so it should be applied shallowly for the trees to absorb in time.

9. Foliar fertilizer spraying enters the leaves through the stomata and cuticle, and then transports to various organs, generally the young leaves are older than the old leaves, and the back of the leaves absorbs water faster than the foliar surface, and the absorption rate is also high. Therefore, when actually spraying, the back of the leaf must be sprayed evenly and sprayed to make it conducive to the absorption of the trunk.

10. Foliar fertilizer spraying should strictly control the concentration, so as not to burn the leaves, and it is best to spray it on a cloudy day or before 10 a.m. and after 4 p.m., so as not to have high temperatures, and the solution will be concentrated quickly, which will affect the spraying fertilizer or cause pesticide damage.

11. Fertilization of urban landscaping, when choosing fertilizer types and fertilization methods, it should be taken into account that it does not affect the city's appearance and sanitation, and the odorous fertilizer should not be applied.

1.Potted plants generally have a greater demand for fertilizer in the peak growing season, and they should be fertilized and supplemented in time to ensure sufficient nutrient supply to grow more vigorously.

2.Most potted plants grow in spring, summer and autumn, especially in spring, when the temperature is right and the growth will be better, and this is the season of fertilization.

3.Once the temperature drops in winter, it is necessary to reduce the amount of fertilizer or stop fertilizer to avoid fertilizer damage.

Fertilization can be applied all year round. In order to better achieve the purpose of fertilization, Oasis puts forward the following suggestions:

1. Because the absorption of nutrients and water is all in the fibrous roots, fertilization should be around the roots, not close to the trunk.

2. For trees with strong roots and far-reaching distribution, fertilization should be deep and large; Trees with shallow root systems should be fertilized shallowly and the range should be small.

3. Nitrogen fertilizer is highly mobile in the soil, and shallow application can penetrate into the root layer and be absorbed by trees; The mobility of potassium fertilizer is poor, and the mobility of phosphate fertilizer is even worse, so it should be applied deeply to the most distributed root system.

4. The basal fertilizer effect is slower and should be applied deeply, and the top dressing fertilizer effect is faster, so it should be applied shallowly. However, it is recommended that after fertilization, it is necessary to irrigate the fertilizer in time to stimulate the fertilizer to penetrate into the soil.

First, look at the fertilization of the ground, pay attention to the different types and quantities of nutrients contained in different soil types, and apply different types of fertilizers.

If phosphorus deficiency is likely to occur on calcareous soil or strong acidic nursery soil, it is necessary to pay attention to increasing the application of phosphate fertilizer, especially increasing the amount of phosphate fertilizer. Generally, the soil is dominated by nitrogen fertilizer, and if the soil is full of nitrogen, the proportion of phosphorus and potassium fertilizer should be increased. Different soil textures, nutrient conditions and fertilizer retention capacity are also different, so the fertilization methods are also different.

The soil has good fertilizer retention ability, and the amount of top dressing can be more and less each time; For sandy soil nurseries with poor soil fertility, the number of top dressing should be more and the amount of each application should be less.

Second, look at the type of fertilizer, seedling topdressing, generally use fast-acting fertilizer.

Such as plant ash, ammonium sulfate, urea, ammonium chloride, potassium chloride, etc., these fertilizers must be completely crushed, and should not be applied in blocks. Organic fertilizers can also be applied, such as human and animal manure water, compost, etc., but they should be fully fermented and decomposed, and raw manure should not be used, and the concentration should be diluted. Nitrogen fertilizer is highly mobile in the soil, and can be shallowly applied to penetrate into the root distribution layer and be absorbed by seedlings. The mobility of potassium fertilizer is poor, and the mobility of phosphate fertilizer is even worse, so it should be applied deeply to the dense distribution of root system.

3. The growth of seedlings is generally divided into four stages: seedling stage, seedling stage, fast-growing stage and hardening stage.

Seedlings in the seedling stage cannot produce nutrients by themselves, and their nutrients are mainly stored in seeds'Nutrient; The seedling stage refers to the appearance of true leaves in the aboveground part of the seedling and the lateral roots in the underground part, until the growth of the seedling increases significantly, and it is sensitive to nitrogen and phosphorus. The fast-growing period is that the aboveground and underground parts of seedlings grow at the same time, and the demand for nutrients is large, so the amount and frequency of nitrogen fertilizer should be increased, and phosphorus and potassium fertilizers should be applied proportionally. In order to promote the hardening of seedlings and improve their resistance in the later stage of growth, nitrogen fertilizer should be stopped in a timely manner, and fertilizer should be stopped in order to improve the resistance of seedlings in the hardening stage.

Generally, annual seedlings need more nitrogen and phosphorus fertilizer in the early stage of growth to promote the growth and development of young roots, and a large amount of nitrogen, phosphorus, potassium and other elements are required in the fast-growing stage. For large-sized seedlings that have become seedlings, the root system is strong, the distribution is far, the fertilization should be deep, and the range should be large, such as Pinus tabuliformis, Ginkgo, Acacia, A. stinkensis, etc., and the fertilization of large seedlings with shallow root system should be shallow and the range should be small, such as tung tree, purple locust and flowering shrubs.

Fourth, depending on the weather, fertilization determines the number of fertilization and the amount of fertilization according to the weather conditions.

The temperature is low, the seedling absorption is less, the temperature is high, the root system grows vigorously, and the fertilizer absorption is more. It is best to choose when the weather is clear and the soil is dry. On rainy days, due to the slow absorption of water by tree roots, not only is it difficult to absorb nutrients, but also fertilizer is easily washed away by rain, resulting in waste.

In times of drought, it is best to use wet application, that is, the fertilizer is turned into liquid fertilizer with water and evenly applied to the nursery ground; Dry application can be used for moderate rainfall, that is, the fertilizer is applied in a furrow, and the depth of furrow application should be in the distribution layer of the root system, so as to facilitate the absorption of fertilizer by seedlings.

1. Types of fertilization.

Autumn fertilization should be mainly organic fertilizer, and combined with fast-acting fertilizer nitrogen, phosphorus, potassium and other combined application. Before application, in the organic matter base fertilizer, superphosphate and other phosphate fertilizers are added to the compost together; When applied, a certain amount of available nitrogen fertilizer is combined with the application of a certain amount of available nitrogen fertilizer, such as urea, ammonium carbonate, ammonium sulfate, etc.

2. Fertilization time.

The fertilization time varies depending on the species and variety. Fruit trees are suitable around the autumn equinox (late September, after fruit picking of mid-to-late maturing varieties). The fertilization time of pine and cypress starts in October and ends before the soil freezes, but the earlier the fertilization period, the better the effect.

3. Fertilization method.

The specific fertilization method and amount should be determined according to the condition of the tree body and the soil fertility status.

1) Fertilization of furrows.

Fertilization is done in ditching between rows, plants or interlaced rows, and can also be combined with deep turning.

2) Fertilization throughout the garden.

This method is often used when the roots of adult trees or dense plantations have been spread throughout the garden, and the fertilizer is evenly spread in the garden and then turned into the soil.

Garden seedlings are generally irrigated and fertilized in the spring of the month.

This month, the temperature drops, and in late October, the trees begin to lose their leaves, and the flowers and trees enter a dormant period.

1. Prepare for planting trees in autumn, and start planting as soon as the cold-tolerant trees fall in the second half of the year.

2. Green space maintenance: remove dead trees in time and water them in time. Green space and lawn should do a good job of picking grass and cutting edges. Grass and flowers that grow poorly should be fertilized.

Basal fertilizer can be applied in March and winter.

Nitrogen fertilizer can be applied during the rainy season.

Fertilization must consider the soil, because: first, only when the soil is insufficient for a certain nutrient**, fertilization is needed, and it is not necessary to apply all the essential elements into the soil, because most of the nutrients are **, otherwise, the soil (or atmosphere) can already be filled to cause waste, and even cause crop poisoning. This is sometimes overlooked.

Second, after the fertilizer is applied to the soil, there will be a series of changes, which will affect the effect of the fertilizer to varying degrees. If nitrate nitrogen fertilizer is applied in paddy fields, it will inevitably reduce fertilizer efficiency.

Apply basal fertilizer in March and winter (it is best to apply before freezing in winter), usually apply thin fertilizer frequently depending on the situation, and apply nitrogen fertilizer is best applied before rain or covered with soil film.

Spring and autumn temperatures are more suitable.