Respone And Interaction For Water And Fertilizer Coupling Of Pear Orchard

Water and fertilizer play an important role in the process of growth and developmentof fruit trees. Reasonable water and fertilizer management practices have importantimplications to guide the production practice of fruit trees.The dynamic changes of soilphysicochemical properties, the plant nutrient contents, and pear fruit quality wereanalyzed with the application of water and fertilizer coupling on5-year-old ’ Huangguan ’pear trees. The objective is to discussion the pattern of fertilizer and water. Results wereshowed as the follows:1.The content of total N and total P of CK in0-20cm,20-50cm and50-80cm soil layerwas gradually decreasing trend. The total N content in different periods of other treatmentswas first increased and then decreased, the content of total P is ascending, descending andascending trend. The coupling of water and fertilizer application of half amount offertilizer increased the content of total N and total P in0-20cm,20-50cm and50-80cm soillayer significantly, and also significantly increased the total N content in50-80cm soillayer of next year. The treatment that water and feitilizer coupling of total amount offertilizer improved the content of total N in soil layer of0-20cm,20-50cm in the next yearsignificantly.2.The hydrolysable N content of different treatments in the mature stage were up in0-20cm,20-50cm and50-80cm soil layer, the coupling of water and fertilizer applicationof half amount of fertilizer increased apparently. The available P content of mature periodcompared with bud break,the total amount of fertilizer without water increased theavailable P of0-20cm soil layer significantly, and the coupling of water and fertilizerapplication of half amount of fertilizer improved obviously in20-50cm and50-80cm soillayer.The hydrolysable N content of the total amount of fertilizer without water alsoincreased more than other treatments in the nexr year. In addition, the available P contentof different treatments were significantly reduced in the next year.3.By comparison of bud break and mature period, the treatment that water andfeitilizer coupling decreased total K content, while increased available K contentsignificantly, which indicating enhanced the transformation ability of total K to available K.The following years, Total K and available K content of different treatments in0-20cm,20-50cm and50-80cm soil layer were increased significantly, the coupling of water and fertilizer significantly higher than others.4.The coupling of water and fertilizer could significantly improve soil pH values,urease and phosphatase activities in different growth periods.5.Water and fertilizer coupling of the full amount of fertilizer treatment can obviouslyimprove the trunk girth length of ’ Huangguan ’ pear, increasing the number of long branch,medium branch and flower bud, significantly higher than other treatments.6.The coupling of water and fertilizer application of half amount of fertilizer increasedN, K, Fe element content in leaves;The treatment that water and feitilizer coupling of totalamount of fertilizer improved the content of B、Mn element in leaves.7. Treamtment effect of coupling of water and fertilizer on soluble sugar and titratableacid increased by25.5%and164%respectively, was significantly higher than othertreatments, but the Single fruit weight, Fruit form index, Soluble solid and Vc contentshowed no significant difference comparing with the CK.