First, pay attention to seasonal nitrogen is an important nutrient component of chestnut growth and results, from the early spring, the absorption of nitrogen in chestnut tree body has been increasing. Therefore, in the early spring chestnut trees before 2-3 months should be promptly added nitrogen fertilizer. Second, pay attention to the types of nitrogen fertilizers are many types, according to the nitrogen fertilizer in the nitrogen form can be divided into: ammonium nitrogen fertilizer, nitrate nitrogen fertilizer and amide nitrogen fertilizer. Ammonium nitrogen fertilizer has ammonia, ammonium bicarbonate, ammonium chloride and other. Nitrogen fertilizers include sodium nitrate, calcium nitrate, ammonium nitrate, etc. Amide nitrogen includes urea and lime nitrogen. Third, pay attention to ways to put the fertilizer applied in the deeper than the concentration of the root layer, farther, in order to facilitate the development of the roots in depth, the formation of a strong absorption network. Mountain gardens chestnut often surface runoff, nutrients easily lost, deep fertilization some. Nitrogen is easily soluble in water and has a large range of movement in soils. The following two methods of fertilization can be used: (1) Ring fertilization is performed on the outer edge of the castanea canopy projection and the 30 cm depth of the annular groove is deepened. Into the ditch, and then cover the soil. The coverage should be a concave bucket to facilitate the impoundment. To avoid the roots when digging trenches. (2) Digging pits Fertilize and dig several pits below the outer edge of the crown, 30-60 cm in diameter and 30 cm in depth. Apply the fertilizer to the pit and then cover it with soil.
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