During the development of the annual cycle of fruit trees, as the tree grows, the absorption of nutrients (especially nitrogen, phosphorus, and potassium) increases accordingly. The fruit trees with general results are topdressed with nitrogen fertilizer before budding every year. With appropriate amounts of phosphorus and potassium fertilizers, the top dressing time should be sooner rather than later. This topdressing is very important for both flowering and weak trees. As the age of the tree grows and the amount of results increase, the number of top dressings should be appropriately increased. To promote fruit enlargement and flower bud differentiation, but also to overcome the size of the annual results also have a certain effect.
First, the type of top dressing
Most people think that spring is the peak period of vegetative growth, which requires more nitrogen fertilizer, so purely topdressing urea is not advisable. Nitrogen is conducive to the growth of foliage, phosphorus is conducive to the development of roots and branches thick, potassium is conducive to the efficient deployment of nutrients. If the topdressing nitrogen fertilizer is applied, the branches and leaves grow fast, but the root development is poor and the new shoots are delicate and can not be quickly ligninized, which is not conducive to the formation of sufficient amount of functional leaves, and is not conducive to early and early stop of spring shoots.
Spring fruit trees require more nitrogen, but they do not need only nitrogen fertilizer. Recommended for everyone high-nitrogen water-soluble fertilizer, which is high nitrogen in order to promote the growth of spring shoots, although the content of phosphorus and potassium is lower, but can meet the coordination between the elements, so that fruit trees get a more comprehensive nutrition.
Second, the amount of fertilizer to determine
In the fertilizer management of fruit trees, we must not engage in autumn basal fertilization and rely solely on top-dressing, that is, the so-called “recovery of the bottomâ€, nor can we make full use of base fertilizers in the autumn when base fertilizers are applied, and no longer apply top dressing, that is, the so-called "A shelling." The correct approach should be based on fertilizer, top dressing supplement.
The amount of topdressing before sprouting depends on three factors: the amount of fertilizer applied in the fall, the tree vigor, and the number of flower buds.
The base fertilizer is insufficient, the tree vigor is weak, and the flower buds are numerous. The amount of top dressing before budding is as large as possible; the bottom is full, the tree vigor is strong, the amount of flowers is moderate, and the top dressing may be less before germination. For individual years of seriousness, this year is the orchard in the first year. It should also be top-dressed and must not be chased. Although no obvious problems can be seen without top-dressing, it will affect the stability of tree-trends.
Because the water-soluble fertilizer is a multi-element compound fertilizer that can be completely dissolved in water, its main features are low dosage, low use cost, rapid crop absorption, high utilization of nutrient components, and convenient use, and is very suitable for top dressing in orchard spring.
Spring fertilization, try to avoid the use of furrows and other root-causing soil fertilization methods, because the spring nutrients began to be transported upwards, cut roots will result in reduced absorption, affecting growth, and after rooting, the roots will not only heal the wound to consume nutrients; but also easy to cause root Corrosive bacteria infestation.
Third, according to the growth habits of fruit trees reasonable fertilizer
Roots of fruit trees grow three times a year, that is, spring summer and autumn. Although the root growth time in spring and summer is relatively short, timely fertilization is very important. The effect of fertilization in spring is to protect the flowers and fruits, summer fertilization is to ensure flower bud differentiation and fruit enlargement, and in the autumn it is to promote the differentiation of flower buds and to increase the storage nutrition of the tree, which will lay the foundation for the spring flowering results in the coming spring. Therefore, fertilization is divided into three periods: spring (March), summer (June), and autumn (September). The new shoot grows twice a year, that is, the spring shoot growth period and the autumn shoot growth period (actually summer shoots).
The first time in the new growth stage was synchronized with flowering and fruiting for the first time in the two growth stages, and the second time was in sync with fruit enlargement and was in a nutritional competition stage. Therefore, to protect the fruit and fruit, it is necessary to control the growth of spring shoots. To promote fruit enlargement, it is necessary to control the amount of autumn shoot growth. The nutrient status of fruit trees varies from year to year, showing spring nutrients from more to less, summer in a low nutrient period, and autumn nutrients begin to accumulate, and winter nutrients are at a relatively high level.
1, spring
The spring is the use of organs for the storage of nutrients: This period includes sprouting, leaf development, flowering, and the rapid growth of new shoots, from sprouting to spring shoots. During this period, the energy of all life activities of the fruit trees and the construction of new organs are mainly dependent on the storage of nutrition in the previous year. It can be seen that the amount of stored nutrients is not only related to the early spring sprouting, leaf development, flowering, pollination, fruit setting and shoot growth, but also affects the growth and development of fruit trees and the accumulation of assimilation products in the later period. If there is too much flowering, the growth of new shoots and roots will be inhibited, and fruit size and flower bud formation cannot be guaranteed. The increase of fruit cells is closely related to the size of the posterior leaf area of ​​the spring leaf. Fruit trees with high storage and nutrition levels are large and thick, with early and neat flowering. They also have strong resistance to the bad environment. They show large leaves, strong branches, high fruit setting, and rapid growth.
After the flowering period of fruit trees, the growth of young shoots, young fruit development, and physiological differentiation of flower buds increased the demand for nutrients. The consumption of roots and stem storage nutrients was gradually reduced due to spring growth, and the leaves only grew to mature leaf area. The photosynthetic products produced at about 70% can be shipped out, so there is a critical nutrient or conversion period. Fierce competition in nutrients often causes the 9-13th leaves of apple and pear shoots to become smaller, fruit drops worse, and flower buds differentiate poorly. In the previous year, when there was sufficient nutrition for storage, the proper amount of flowers in the year would be conducive to the conversion of nutrients in this period, so that the photosynthetic products produced by the vegetative organs in the later stages of the tree could be supplied in time for production.
2, summer
The top dressing of fruit trees in summer is an important fertilization period for fruit trees in the year. The role of topdressing in the summer is to promote flower bud differentiation and reduce the size of the year; the second is to enlarge the fruit and increase the yield; the third is to promote the color and surface light and improve the appearance quality of the fruit; the fourth is to improve the fruit's intrinsic quality.
Practice has proven over the years that manure in the summer is more suitable for fertilizers with high potassium, low nitrogen and phosphorus. This is beneficial for promoting flower bud differentiation, enlargement of fruit, promotion of coloration, and improvement of fruit surface light. Combining the fertilizer habits of fruit growers, it will be carried out immediately after the top dressing in summer and the sooner the better.
3, autumn
The significance of fruit trees in autumn fertilization The greatest feature of fruit trees is the presence of storage nutrients that serve as a link between the two. In the spring of the next year, when the sap flows, it will firstly mobilize reserve nutrients, supply budding, leaf spreading, branching, flowering, and fruitless storage. This will inevitably lead to contradiction between nutrient growth and reproductive growth. Received leaves from the fruit. After the fruit trees have completed their cycle growth, all organs no longer increase in size. There is only one peak of growth in the root system. The absorbed nutrients are greater than the consumption.
The assimilation products in the leaves except for a small part of the fruit, the vast majority from the 1-1.5 months before the deciduous began gradually returning to the phloem, pith and root of the branches back to storage until the end of the fallen leaves. Excessive growth stage results or early defoliation caused by pests and diseases will result in greater nutrient consumption, less accumulation, and insufficient tree storage nutrients. During this period, storage of nutrients will lead to wintering of fruit trees and sprouting, flowering, leaf spreading, and larking in the following spring. Fruit and other processes have a significant impact on the successful completion of the process. It can be seen that fully improving the storage of nutrients in the tree is an important guarantee for fruit production, quality, and stable production. Before harvesting the fruit, the whole tree was sprayed with 0.5% urea plus 0.5% potassium dihydrogen phosphate. Interval of 10 days or so, even spray 3-4 times, can increase the tree storage nutrition, is conducive to flowering results in the coming year.
SHANGHAI ROCATTI BIOTECHNOLOGY Co., Ltd is a leading exporter and supplier of medical equipment in China. We are not only manufacturer of medical equipment but also we are professional on providing one-stop solution of hospital project, clinic project, Education University, laboratory, government tender as well as distributors. With more than 10 years of experience, our products have been exported to more than 100 countries and have obtained good reputations because of our competitive price, high quality products and excellent service.
Hospital Bed,Hospital Bed Automatic,Abs Hospital Bed,Manual Hospital Bed With Wheels
Shanghai Rocatti Biotechnology Co.,Ltd , https://www.ljdmedicals.com