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Fertilization of adult hazelnut trees should be based on analysis of leaves and soil of hazelnut trees. Rational fertilization is one of the important measures to promote growth and development and hazel early high yield, while increasing soil fertility, increase soil organic matter content, promote tree growth and health state, promote differentiation, reduce flower, fruit drop, increase production, to prevent the size of the year . Nitrogen fertilizer is applied every year from March to April , and the strip is applied 30-60 cm below the branches . According to the pH of the soil , an acidic or alkaline form of nitrogen fertilizer is selected. During the whole growth and development of eucalyptus, ammonia, phosphorus and potassium are the main nutrient elements, and the farmyard manure and fertilizer should be reasonably matched. In autumn, fertilization is mainly based on the application of farmyard manure, and in the growing season , the fertilizer is the multi-component fertilizer ( nitrogen, phosphorus and potassium ) . The autumn farmer's fertilizer is carried out from September to October . The amount of fertilization is determined according to the age of the tree. Generally, one fertilization is 20 to 25 kg. As a result, the tree should increase the amount of fertilization. Use a multi-component compound fertilizer. Phosphate fertilizer can be applied at any time of the year, preferably under the drip line of the tree. Potassium fertilizer can be applied together with nitrogen fertilizer. The application is effective for 2 years. Other important nutrients iron and boron, if necessary, administered once thousandth of boric acid or borax in an amount of 120 g per hazel. Potassium sulfate is superior to potassium chloride. In phosphorus-deficient soils, application once is usually effective for 2-3 years. Fertilization time: 1 month 4 inferior, inferior to the second end of June, the amount of fertilizer to be combined with water: saplings (less than 4 years old), applied strain of 150 to 400 g, age greatly increased fertilization. The fertilization method mainly uses annular fertilization. Applying chemical fertilizers in a ring, there is a certain distance from the trunk, evenly spread, 5 to 10 cm deep , and then covered with soil. When the content of N in the leaves of the scorpion is less than 1.5% , the amount of N is 500g per tree ; when the content of P is less than 0.14 , the amount of phosphorus is 500g per tree , and the content of K is less than 0.5 , sulfuric acid Potassium is used in an amount of 1000 grams per tree . When the content of N in the leaves of the gardenia is 1.5-2% , the amount of N is 4500 grams per tree ; when the content of P is 0.14-0.16% , the amount of P is 300 grams per tree , and the content of K is 0.5- At 0.8% , the amount of K is 750 grams per tree .
1 . Scorpion tree fertilization autumn application base fertilizer
  It refers to collecting the fruit fall from the front (September to October) organic fertilizer into the soil freezing application. The base fertilizer is mainly based on manure, compost, green manure, human feces and urine, and is a basic fertilizer for supplying various nutrients to the tree for a long time. At the same time, it is necessary to add an appropriate amount of nitrogen, phosphorus and potassium compound fertilizer. Adding organic fertilizer can increase soil porosity, loosen soil, accelerate soil fertility, improve soil water, fertilizer, gas and heat, and is beneficial to microbial activities. Especially in the early autumn, the base fertilizer is applied, and the decomposition time of organic matter is longer. It is not only highly mineralized, but can be used for root absorption and utilization in spring. It can also promote flower bud differentiation, improve flower bud quality and enhance wintering of trees. moisture retention, increase in temperature, the rhizosphere to prevent frostbite. If the fall is too late to apply the base fertilizer, the spring can be applied to the spring before the germination. But in the spring base manure fertilizer to play slow, and often can not meet the growing needs hazel early spring, late shoot growth and lead again, affecting flower bud and fruit development.
2 . Hazelnut fertilization
   Topdressing can not only make the tree strong in the past, but also obtain high-yield, high-quality fruits, and lay a good foundation for the growth results of the coming year. It is an indispensable fertilization link for the increase of eucalyptus. Hazel general fertilizer twice: the first time in late May to early June. At this time, it is the fruit ovary expansion period and the new shoot growth period; the second time is from early July to mid- July . Due in early June to mid-July early as nuts and flower buds began to differentiate the rapid development period, during which fertilizer to enrich vital to the growth and development of fruit, flower bud, branch. In addition, according to the needs of tree growth and development, foliar spray fertilizer can also be used.
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