Around the pear tree fertilization

Amount of phosphorus and potassium are also applying P and K requirements were larger pear nutrients , each producing 100 kg fruit absorbs about 0.1 to 0.25 kg of phosphorus pentoxide , 0.4 to 0.6 kg of potassium hydroxide . Pear on the results of tests done showed that P and K fertilizer nitrogen is higher than the single rate of 50% to 85%. P and K application can not only improve the pear production , but also to promote root growth , increased leaf photosynthetic products to the stems, roots, fruits and other parts of Collaborative Transportation , while phosphate has a very significant role in inducing root , will moderate phosphate deep application can promote deep roots to the soil stretching, can significantly improve the drought resistance of fruit trees , to reduce the incidence of disease .

Pear in the soil with phosphorus and potassium content is high , increasing phosphorus, potassium , often without fertilizer , only pay attention to nitrogen and phosphorus, potash fertilizer application in order to achieve better results.

Rational application of boron, zinc , iron and other trace elements boron fertilizer can significantly reduce the occurrence of pear fruit shrink disease , improve fruit set and reduce pulp cork zone formation. Boron and boron to potential mild pear , flowering can spraying a concentration of 0.3 % ~ 0.4% borax solution . Serious soil boron with germinating fruit per plant soil application before 100 to 250 grams of borax , valid for up to 3 to 5 years and, once again in full bloom spraying concentration of 0.3% to 0.4 % borax solution , the effect better .

Applying zinc fertilizer on correcting pear leaf spot and leaf disease effect is very significant , generally diseased branches recovery rate of 90 % or more, can improve the rate of pear fruit , pome fruit production increased , and can increase the nitrogen and phosphorus in the leaves the levels of calcium . Spraying more effective method is to use 0.2% zinc sulfate and 0.3% to 0.5 % urea mixture promptly after the onset of fruit tree sprayer spraying , but also in the spring 3 weeks after spraying falling pear , or a 6 % before germination 8% aqueous solution of zinc sulphate spraying can play a preventive role. Soil application of zinc sulphate less effective application of Zn chelate and attitude is better, but the cost is high, generally more cost-effective primary prevention is still spraying . A large number of organic fertilizer to some extent, reduce zinc deficiency may play a role .

For the pear yellow chlorosis to treatment , the most commonly used method is better are: soil application , the use of "local rich iron law ," the upcoming ferrous sulfate and cake ( cake, peanut cake , cottonseed cake ) and ammonium sulfate at a weight ratio of 1:4:1 , basal concentration in fruit bud before applying the thin roots more layers , according to the fruit size and the degree of yellowing , fruit per plant control the amount of application 3 ~ 10 kg . Foliar spraying directly the effect of ferrous sulfate is generally poor , the application of fulvic acid iron sprayed with a mixture of urea treatment etiolated better, but of short duration ; also be applied by 0.3% ferrous sulfate , urea 0.5 % in fruit growing season garden hand sprayers spraying once a week . For local conditions , can also use a strong trunk injection machine xylem ferrous sulfate injection , although the effect is better, fertilizer and rarely , typically only about 1% of soil application , but the method is only suitable for adult fruit , injection dose range is narrow, easily administered improperly influence the normal growth of pear trees .