First, trace element supplement for why?
　　Everyone knows the importance of NPK, can understanding of trace elements is not enough, in the past a lot of straw using organic fertilizers can be added some trace elements, which are the straw fertilizer usage is less and less, the fruit production is rising again, underground trace elements, lead to a lot of fruit physiological diseases, such as yellow leaves, lobular, knot fruit, chicken feet, etc.; Tree will cause disseminated disease, such as root rot, rot （epidemic, damping off, ring spot, etc. So experts remind more than 90% is a physiological disease caused by deficiency, lack of iron yellow pear, zinc deficiency lobules, calcium and zinc have chicken feet disease, lack of boron aplasia induced a knot in ones fruit fruit seeds, etc. It shows that trace elements and a large number of elements are equally important, individual, fruit trees and the human body, as if the lack of any one element, can lead to unhealthy physique, which affects the yield and quality of fruit trees. So adding trace element is very necessary.
　　Second, how to scientific using trace elements?
　　Most pear tree roots in the ground around 60 cm, so in the underground ditch or hole 15 centimeters, per 300 catties production in 2 jins, more than 500 catties production in 3 ~ 5 jins. After using water. There is no soil plowing, but after the fallen petal two over one thousand spraying, defect is valid for short. The advantage is quick effect, can be used multiple times.
　　Third, use what kind of trace elements?
　　Experts tell best chelating states or amino acid trace elements, their high stability, fast dissolve easily absorption utilization rate is high, it is not easy to produce the adr. In shijiazhuang city zhao country, some of the orchard with hebei ark company production of "silicon valley power" trace element fertilizer, the effect is very ideal, the tree body potential enhanced obviously, blade healthy shine and various physiological disease, infection diseases is reduced greatly. HaoGuoLv increased and quality, economic efficiency increases.