- Author: LIU Songzhong, WU Yang, LIU Jun, TIAN Haiqing
- Keywords: Pear; Root-zone; Organic manure; Growth; Physiological characteristics;
- DOI: 10.13925/j.cnki.gsxb.20150005
- Received date:
- Accepted date:
- Online date:
PDF （） Abstract（）
Abstract: 【Objective】The objective of this study is to explore the method of fertilization and quantity for organic manure in pear orchard.【Methods】Two-year-old pear trees potted in sandy and loam soil were used as materials to investigate the changes of growth and physiological characteristics including growth and type of new shoots,leaf water potential,net photosynthetic rate(Pn),transpiration rate(Tr) and stomatal conductance(Gs) after the fertilization of 10%,20% and 30% organic manure only in 2/4 root-zone.【Results】The results indicated that the growth of new shoots as well as the number of long,medium and short shoots and the type of new shoots increased significantly when 2/4 root-zone was improved by organic manure. The shoot growth rate and total number of shoots increased first and then decreased with the increase of organic manure in sandy soil. However,those declined gradually in loam soil. The treatment of 20% and 10% organic manure obtained the largest growth rate in sandy and loam soil,respectively. Leaf physiological characteristics such as water potential,Pn,Tr and Gs were also regulated by organic manure. The leaf physiological characteristics did not changed much with 2/4 root-zone improved by 10% organic manure. However,the higher levels of organic manure application,such as 30% organic manure insandy soil or 20%,30% in loam soil in hibited physiological characteristics to some degree.【Conclusion】Considering the growth and leaf physiological characteristics,20% organic manure in sandy soil and 10%in loam soil are the optimal treatments.