Pear tree scientific fertilization are important measures to improve the quality of produced goods. Pear tree fertilizer timely, imbalance can affect normal GuaGuo pear tree and growth; Enter the results of large amount of flower bud, fruit rate is high, a large number of results that small fruit quality is poor, adjust the volume of the flushing by hydrophobic flower thinning, in order to achieve efficient high quality and high yield.
　　The four key period of pear fertilization
　　Flowering topdressing boron boric fertilizer is pear flower needs more trace elements, general appropriate after the beginning of flowering and Xie Hua foliar each spray a concentration of 0.2% ~ 0.3% boric acid solution, or 0.3% ~ 0.5% borax solution, can promote the absorption of sugar, pollen activation metabolic process, can stimulate the pollen germination, fertilization embryo development achievement, improve the fruit of vitamin C content. Boron deficiency, 667 square meters with borax and boric acid from 200 ~ 200 grams and farmyard manure mix until open ditch buried, can prevent pulp cork and improve fruit quality.
　　Young fruit period topdressing nitrogenous fertilizer after pear trees Xie Hua commonly, young fruit began to grow, should combine weeding scarification, nitrogen 0.3 ~ 0.5 kg per tree furrowing, potash, 0.2 ~ 0.3 kg, buried p 0.3 ~ 0.5 kg. The fertilization mainly contributed to root and shoot growth, expansion of leaf area, and makes the young fruit volume increases quickly.
　　Topdressing fruit period to promote long fat in late June and mid-july, must be increasing fertilizer application. Application of a piece of human excrement, 3050 kg, 0.2 ~ 0.3 kg urea mix furrowing pouring, and then turns the soil in a timely manner. At the same time every 15 ~ 20 days sprayed a 0.2% ~ 0.3% potassium dihydrogen phosphate, 3 times in a row, can reduce the plant diseases and insect pests occurrence, also can promote the fruit growing, good growth.
　　Strong fruit period after grow fat is a substantial accumulation of nutrient fruit 8 ~ 9 month period, the fertilization mainly cooperate with NPK fertilizer, promote the fruit growth, improve the yield and quality. General every tree should be buried n （0.3 ~ 0.3 kg, p 0.2 ~ 0.3 kg, potash, 0.3 ~ 0.4 kg, can promote the metabolism of carbohydrate, increase the fruit sugar and sweetness.
　　Pear thin flower thinning key principles
　　According to the amount of flowers, such as weather, blooming trees, fruit forces determine how much of the steam leave flowering fruit and young fruit cell depend mainly on the nutrition of tree storage decision, dropped the redundant and thin as soon as possible, reduce unnecessary consumption; Only by focus on nutrient should stay on the fruit of can become a fruit. Hydrophobic so early is better than late hydrophobic, thin bud is better than hydrophobic flowers, thin flower is better than fruit thinning. But it depends on the quantity, weather, blooming trees, fruit forces, etc., and then make a decision is a thin grey thin flower thinning, or all three.
　　According to branches hydrophobic leave if dominated average individual load, certain specific scanty each tree （branch）， but also varies between tree （branch）， stay strong, the weak for less. Tree full of flowers and the annual tree flower bud （60%）， more early to hydrophobic hydrophobic. Weak branches sequence can be full branches full sequence hydrophobic besides, leave a blank in the audience as a result, just stay strong branches fruit weight, no fruit. Large and medium-sized fruit varieties, each 15 ~ 20 cm left a fruit. Spend about 25% of the amount of off-year trees, appropriate thin for less, less or no blank. Zhuang zhuang branches for branch pressure potential fruit in a fruit. Weak （branch） not branch fruit tree. Memorizing a weak back stay strong fruit group, fruit set a little left.
　　According to vice tip to determine the hydrophobic leave tip and strong that can grow into big fruit, fruit can leave when enough QuanShuHua double; The doctrine of the mean vice tip and strong left fruit weight; No vice tip weak units in the case of no fruit also enough quantity, can not stay.
　　According to the sequence of a certain hydrophobic stay in a certain inflorescence, pear flower to open, in turn inward, to open the first young fruit large, generally easy to grow into big fruit, fruit shape correct. So should be left side lace fruit, thin to the rest of the flowers or fruit.
　　According to young fruit growing thin peduncle to stay long, thick, elongated and young fruit calyx closed end and prominent prone bred big fruit, reason should leave. Calyx open drain to the shape of small and fruit. The principle of fruit thinning is to leave a better. To drain to the first fruit of diseases and pests, slanting fruit, small fruit, fruit, leaf rust, if excessive when further to keep better, adjust the distribution of all over the tree. For fruit thinning can be divided into two times of safety between fruit DingGuo after first.