[Effects of root-knot nematodes on cucumber leaf N and P contents, soil pH, and soil enzyme activities].
A pot experiment was conducted to study the effects of inoculation with root-knot nematodes on the cucumber leaf N and P contents, and the rhizospheric and non-rhizospheric soil pH and enzyme activities. The rhizospheric soil pH didn't have a significant decrease until the inoculation rate reached 6000 eggs per plant. With the increase of inoculation rate, the leaf N and P contents, rhizospheric soil peroxidase activity, and rhizospheric and non-rhizospheric soil polyphenol oxidase activity all decreased gradually, rhizospheric soil catalase activity was in adverse, non-rhizospheric soil pH decreased after an initial increase, and non-rhizospheric soil catalase activity had no regular change. After inoculation, rhizospheric soil urease activity decreased significantly, but rhizospheric and non-rhizospheric soil phosphatase activity and non-rhizospheric soil peroxidase activity only had a significant decrease under high inoculation rate. In most cases, there existed significant correlations between rhizospheric soil pH, enzyme activities, and leaf N and P contents; and in some cases, there existed significant correlations between non-rhizospheric soil pH, enzyme activities, and leaf N and P contents.
College of Life Sciences, Nankai University, Tianjin 300071, China. xuhua04@mail.nankai.edu.cn
Hua
H
Xu
Wei-Bin
WB
Ruan
Yu-Bao
YB
Gao
Xiao-Yan
XY
Song
Yu-Kun
YK
Wei
D000818:Animals; D018553:Cucumis sativus / Q000254:growth & development / Q000378:metabolism / Q000469:parasitology*; D006863:Hydrogen-Ion Concentration; D009348:Nematoda / Q000502:physiology*; D009584:Nitrogen / Q000378:metabolism*; D010758:Phosphorus / Q000378:metabolism*; D018515:Plant Leaves / Q000378:metabolism; D018517:Plant Roots / Q000469:parasitology; D012987:Soil / Q000032:analysis*; D014510:Urease / Q000032:analysis
D012987:Soil; D010758:Phosphorus; D014510:Urease; D009584:Nitrogen