Reporter: It is now the peak season for the growth of fruit trees. What is the effect of fruit tree spray fertilizer?
Experts: The effect of fruit spray fertilizer is better, which is mainly related to the nutritional characteristics of fruit trees. Fruit trees are perennial plants, and their colonization is strong. In addition to the tall trees, they consume large amounts of nutrients in the soil in order to obtain good growth and satisfactory yield. Most of the orchards are located on sandy beaches, sloping fields and fertile soil. In the management of orchards, the N, P, and K nutrients required for fruit trees are the “three elements of fertilizers†and can be supplied through the roots and fertilized from the soil. The tall tree of the fruit tree, under the condition of colonization for many years, can't get the corresponding return and supplement for the medium-sized elements and trace elements consumed. In addition to the rapid expansion of the orchard area in recent years, the application of organic fertilizers has not kept pace, which has intensified the deficiency of trace elements. In particular, the introduction and promotion of various high-yield tree species and exotic tree species have high demand for trace elements. These changes have all aggravated the increase and urgency of the demand for trace elements in fruit tree production.
Reporter: In the current production of fruit trees, what are the performances of the missing trace elements?
Experts: In the production of apples, pears, and peaches in northern orchards, there are common yellow leaf diseases caused by iron deficiency, lobular diseases caused by zinc deficiency, and rotten heart disease caused by lack of boron. In the southern orchards, the symptoms of deficiency of magnesium and boron deficiency in citrus trees are also common. In recent years, various physiological diseases caused by calcium deficiency in fruit trees such as apple, litchi and longan have also been found in the orchards in the south and the north.
Reporter: Foliar spraying fertilizer is an effective method for correcting trace element deficiency in fruit trees?
Experts: Fruit trees, like other plants, have a low demand for trace elements. If the method of applying the soil is used, the amount of application is small, and the application is not uniform. The large amount of application is not only costly but also has a fixed effect on the soil and cannot be effectively used by fruit trees. Absorption and utilization, resulting in low utilization of trace elements fertilizer.
The nutritive characteristics of trace elements are different from those of a large number of elements. Because the shape of fruit trees is tall, the transport process of trace elements from roots to leaves is long, and the redistribution of leaves to fruits is also difficult. Therefore, trace elements are only supplied from roots, yet Satisfy a large number of fruit tree outcomes. The application of trace elements to the fruit tree leaves can be targeted, fast supply, can directly, effectively and quickly solve the problem of trace element deficiency.
Reporter: What are the technical points for fruit tree spray fertilizer?
Experts: 1. Appropriate concentration, too low to achieve the effect, too high will produce phytotoxicity, the most appropriate concentration varies depending on the type of crop.
2. Spraying times. Fruit trees usually have to be sprayed 2-3 times. In case of special problems such as disasters, the number of sprays must be increased.
3. Spray site. Leaves, stems, flowers, fruits can be sprayed, but spray, buds when the attention concentration should not be too high. Spray the leaves and spray both sides. Since there are more stomata on the back, spray both sides.
4. The spraying time of the day should be avoided at noon, before 10 o'clock in the morning and 4 o'clock in the afternoon.
Experts suggest that foliar spray fertilizer is an effective method for supplying micronutrients in fruit trees.
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