Before the 1970s, pear, manure, poultry manure, straw, weeds, and deciduous trees were used as fertilizers. Rich in organic matter content, the balance of nitrogen, phosphorus and potassium, and the comprehensiveness of the elements in the middle and trace elements make the pear orchard soil loose and has good ventilation. It also creates good environmental conditions for the survival and reproduction of beneficial bacteria, and the pear tree grows robustly, with high quality and high yield. Maintained a variety of high-quality flavor. In particular, Laiyang Pear, which is famous both at home and abroad, has a rich aroma, thin and thin skin, succulent and juicy, and has a great deal of food.

From the beginning of the 1980s to the present, 30 years ago, the pear area took the mistake of becoming an evolutionary fertilizer leader. “The chemical fertilizers are applied to the province; the chemical fertilizers are not dirty; the chemical fertilizers are not dirty; the nitrogen fertilizer is not used to grow pears.” Has become a habit of people. Many fruit farmers prefer urea, ammonium bicarbonate and other nitrogen fertilizers. Soil organic matter is severely depleted, and elements in the medium and trace elements are depleted. Soil compaction and poor ventilation occur. The original loose sandy sand orchard, the surface soil into a hard crisp stone structure, beneficial bacteria lost the living environment, harmful bacteria multiply, affect the growth of roots and branches and cause serious diseases, fruit quality decline. Investigations in the Laiyang pear area revealed that the original long shoots were short and thick (8 to 10 mm in diameter), and the short fruit bunches were full, with the result of short flower buds as the main flower buds. After the application of chemical fertilizers, the short fruit branches are rare, the branches are thin (4 to 5 mm in diameter) long, and the results of the flower buds of the slender shoots are the main results. Pear, gold pear and other varieties of iron head disease is increasingly serious, Laiyang pear, Fengshui pear and other varieties, although there is no iron disease symptoms, but thick skin, thick flesh, pear large nuclear.

Pear fruit iron head disease and thick skin rough meat disease are mainly long-term partial application of chemical fertilizers, causing severe boron deficiency caused. In the pear fruit, boron is responsible for promoting the transport of sugar, and the serious lack of boron sugar stops the transportation. The pear fruit quickly expands and lacks sugar, and cell necrosis is corked. Pear, gold pear and other varieties of iron head disease. When the iron head disease is serious, cell necrosis around Papaya flower buds shows dry rot symptoms; Laiyang Pear, Fengshui pear and other varieties have symptoms of thick skin, thick flesh, and large fruit nucleus.

To eradicate pear iron head disease and completely solve the symptoms of thick pear, thick flesh, and large fruit nucleus, to restore the pear's original excellent quality, it is necessary to change the fertilization consciousness and get out of the error of fertilizer masters. Establish a fertilization concept of fertilizing fertility, increasing soil organic matter, adjusting the balance of nitrogen, phosphorus, and potassium, and comprehensively targeting micro and trace elements. The first is the use of manure, livestock, poultry manure, straw, weeds, and deciduous farm manure. The second is the application of high-quality commercial organic fertilizers, such as 666.7m2 12% dandelion brand bio-organic fertilizer 400 ~ 500kg, the first year of great success, the second year can eradicate the iron head disease, restore pear quality. Licheng District, Jinxiuchuan Town, Licheng District, produces 200,000 kg of barley annually. At the beginning of the 21st century, long-term fertilisers accounted for more than 50% of iron head diseases, and accounted for more than 90% of the most severe cases. Since 2003, continuous application of dandelion brand bio-organic fertilizer has eradicated iron head disease 2 years later. The third is combined with autumn farmhouse manure or commodity organic fertilizer, for boron deficiency serious and sandy soil pear, 666.7m2 application of borax 3 ~ 4kg; general pear garden application 2 ~ 3kg. The fourth is to start from the pear tree germination, spraying as many sprays as possible with high calcium and boron liquid fertilizer (dandelion No. 1) or 0.3% to 0.5% borax, to improve the fruit quality of loquat and iron head disease prevention effect is significant.

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