Touch Kitchen Faucets,Touch Kitchen Faucets Price,Touch Kitchen Faucets Product Yuyao Zelin Sanitary Ware Co., Ltd , https://www.zelinfaucets.com
According to the biological characteristics of garden trees and the requirements and conditions of cultivation, the characteristics of fertilization are as follows: First, garden trees are perennial plants, which grow in the same place for a long time, and should be based on organic fertilizers, and appropriate chemical application. Fertilizer, fertilization method is based on base fertilizer, base fertilizer and topdressing. Secondly, there are many kinds of garden trees, which have different effects, and the viewing, protection or economic effects are different. Therefore, it is reflected in the differences in the types, dosages and methods of fertilization. There is a lot of experience in this area, which requires systematic analysis and summary. It is known from the above that the environmental conditions of the garden trees are very different. There are barren hills, wasteland, plain loam, waterside low wetlands and surrounding buildings. This increases the difficulty of fertilization and should be cultivated according to cultivation. Environmental characteristics use different fertilization methods. At the same time, when fertilizing trees in the garden, attention must be paid to the beauty of the garden to avoid the occurrence of foul odors that hinder the activities of the visitors, and should be covered immediately after fertilization.
1. Master the characteristics of trees that need fertilizer during different phenological periods
The nutrients required for trees in different phenological periods are different. Under sufficient water conditions, the growth of new shoots depends largely on the supply of nitrogen, which requires a gradual increase in nitrogen from the early stage of growth to the peak of growth. With the end of the growth of new shoots, although the nitrogen requirement of plants is greatly reduced, protein synthesis is still in progress. The thick growth of the trunk continues until the fall. Moreover, plants are rapidly accumulating proteins and other nutrients that play an important role in the growth and flowering of the late spring shoots. Therefore, trees need nitrogen fertilizer throughout the growing season, but the demand varies.
In the slow growth period of new shoots, in addition to nitrogen and phosphorus, a certain amount of potash is also needed. In addition to the weak growth of the vegetative organs of the trees during this period, the accumulation of nutrients is mainly carried out in the plants. Accelerated aging of the leaves, in order to maintain the high photosynthetic capacity of these old leaves, and to stop the growth of plants and improve the cold resistance in a timely manner, in addition to the need for nitrogen and phosphorus, it is necessary to fully supply potassium fertilizer. In the case of ensuring the supply of nitrogen and potassium, the application of multiple phosphate fertilizers can promote the rapid propagation of buds into flower buds through various growth stages.
During flowering, fruit setting and fruit development, the needs of plants for various nutrients are particularly urgent, and the role of potash is more important. In the year of the results, potassium fertilizer enhanced plant growth and promoted flower bud differentiation.
Trees need more fertilizer in spring and early summer, but in this period, due to the weak ability of soil microbes, the nutrients available in the soil are in a relatively short period of time. One of the tasks of soil management and fertilization is to resolve the contradiction between the high nutrient requirements of trees during this period and the low nutrient content in the soil.
In the later stages of tree growth, the need for nitrogen and water is generally small, but at this time, the nitrogen and soil moisture supplied by the soil is high, so irrigation and fertilization should be controlled at this time.
According to the observation of p32 mark on apple, jujube, peach and other trees in Hebei Agricultural University, the nutrient first meets the most vigorous organ of life activity, that is, the nutrient has its distribution center. As the phenological period progresses, the distribution center also shifts. 'Golden crown' apple, in the germination stage, the p32 content in the buds, the most flowering period, the most fruit in the fruit setting period, the most in the flower bud differentiation period. According to the research of Shaanxi Fruit Research Institute, if the nutrient distribution center is centered on flowering and fruit setting, if the amount of topdressing exceeds the general production level, the fruit setting rate can be increased. If a small amount of fertilization is missed during this period, it can promote vegetative growth and often exacerbate physiology. Fruit drop.
The fertilization period of trees varies with tree species. For example, citrus can absorb nitrogen almost all year round, but the absorption peak is in the mid-summer with higher temperature. Phosphorus is mainly absorbed in the high temperature season where shoots and roots grow vigorously, and the winter is significantly reduced. Potassium absorption is mainly between May and November. The chestnut tree began to absorb nitrogen from the germination. After the new shoot stopped growing, the fruit absorbed most during the hypertrophy period. Phosphorus absorbed more slowly after flowering until late September, and almost stopped absorption after November; potassium was very much before flowering. Less absorption, rapid increase after flowering (June), peak absorption during fruit hypertrophy, and sharp decrease after October. It can be seen that the period of application of the three elements also depends on the species. Understanding the need for various nutrient elements in different phenological periods is important for controlling tree growth and development and for developing effective fertilization methods.
2. Master the relationship between tree fertilizer and the external environment
Tree nutrient not only determines the biological characteristics of dry plants, but also the external environmental conditions (light, heat, gas, water, soil reaction, concentration of soil solution). The light is sufficient, the temperature is suitable, the photosynthesis is strong, and the roots absorb more fertilizer. If the photosynthesis is weakened, the synthetic matter from the leaf to the root system is reduced, and the tree absorbs nutrients from the soil at a slower rate. A similar phenomenon occurs when the soil is poorly ventilated or when the temperature is not suitable.
Soil moisture content is closely related to the effect of fertilizer efficiency, soil water deficit, and fertilization is harmful. Because the concentration of fertilizer is too high, trees can not be absorbed and used, but are poisoned. In the stagnant or rainy areas, the fertilizer is easily lost, reducing the fertilizer utilization rate. Therefore, fertilization should be based on local soil moisture changes or combined with irrigation and fertilization.
The pH of soil has a great influence on plant fertilizer absorption. Under the condition of acidic reaction, it is beneficial to the absorption of anions; while under the condition of alkaline reaction, it is beneficial to the absorption of cations. Under acidic conditions, it is beneficial to the absorption of nitrate nitrogen; while neutral or slightly alkaline reaction is beneficial to the absorption of ammonium nitrogen, which is beneficial to the absorption of NH4- at pH = 7; pH=5 ~6 hours, is conducive to the absorption of NO3.
In addition to its direct effect on fertilizer absorption, the acid-base reaction of soil can also affect the solubility of certain substances (such as increasing the solubility of calcium phosphate and magnesium phosphate under acidic conditions. Under alkaline conditions, reducing iron and boron and The solubility of compounds such as aluminum) also indirectly affects the absorption of nutrients by plants.
3. Master the nature of
The nature of the fertilizer is different, and the period of fertilization is also different. The quick-release and volatile quick-acting or fertilizers that are easily fixed by the soil after application, such as ammonium bicarbonate, super-calcium phosphate, etc., should be applied before the trees need fertilizer; For example, organic fertilizers can be absorbed and utilized by trees after they are decomposed and decomposed, so they should be applied in advance. The same fertilizer has different effects depending on the application period. For example, according to the report of the Department of Horticulture of Beijing Agricultural University in 1977, the same amount of ammonium sulfate applied in autumn has a higher percentage of flowering, higher dry diameter, and higher nitrogen content in one year. . Therefore, fertilizer should be applied at the highest economic efficiency. According to Shandong Laiyang Agricultural School Report (1972): In the early stage of nitrogen fertilizer, apples were well colored and bright, and waxy. The later the fertilization period, the poor coloration of the fruit, the less waxiness of the peel, and the opposite of the above results. Because the nitrogen fertilizer is applied later, it promotes vegetative growth and prevents nutrients from accumulating. It is appropriate when the application period of nitrogen fertilizer is appropriate, and the literature reports are also different, and there are contradictions. Therefore, it is decided that the application period of nitrogen fertilizer should be combined with the nutrient status of the tree, the characteristics of fertilizer absorption, soil fertility and climatic conditions to achieve better results.
Total 1 | <First <Prev 1 Next> Last> |
share to: