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《亚洲农业研究(英文版)》 2012-04
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Effect of Long-term Drip Fertigation on Root Growth of Lychee and Soil pH

DENG Lan-sheng*,TU Pan-feng,ZHANG Cheng-lin,LI Zhong-hua College of Natural Resource and Environment,South China Agricultural University,Guangzhou 510642,China  
Through field experiment,we explore the impact of long-term drip fertigation on growth and distribution of lychee root and changes of soil pH in different layers of soil in lychee garden.The results show that drip fertigation can significantly promote the growth of lychee roots,and increase the contact area of root and soil;if it experiences six years of drip fertigation successively,the dry weight of root,root length and surface area of root in soil in drip fertigation area,will be 2.29 times,2.17 times and 2.25 times that in non-drip fertigation area,respectively.The lychee root is mainly distributed in 0-40 cm layer of soil,but there is conspicuous difference between drip fertigation area and non-drip fertigation area in terms of root distribution in 0-20 cm and 20-40 cm layer of soil.Drip fertigation is more favorable for the root to go deep inside the soil.Under long-term drip fertigation,the soil acidification in lychee garden is prominent,and in comparison with non-drip fertigation area,there is the greatest decline in soil pH in 10-20 cm layer of soil in drip fertigation area,reaching 1.47 units.
【Fund】: Supported by Ministry of Education Project of Integrating Production Teaching and Research in Guangdong Province(2009B09030332);; Science and Technology Plan Project in Guangdong Province (2010A020506022);; Special Public Welfare Industry(Agriculture) Scientific Research Foundation of Ministry of Agriculture(201103003)
【CateGory Index】: S667.1
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