Responses of Nitrogen and Related Enzyme Activities toFertilization in Rhizosphere of WheatEnglish Full Text

YUAN LING;HUANG JIANGUO and YU SHANGQI(College of Natural Resources and Environment, Southwest Agricultural University, Chongqing 630716(China))(Equipment Division, Southwest Agricultural University, Chongqing 630716 (China))

Abstract: In the present experiment, wheat seedlings （Trticucum aestivum L.） were grown on a purple soil withvarious fertilizer treatments in order to investigate the responses of nitrogen and related eusyme activitiesin the rhizosphere. The results revealed the increments of both organic matter and total N in the soil withthe proximity to the growing roots, especially in the treatment of supplying pig manure in combination withchemical fertilizer, suggesting that they could come from root and microorganism exudation which could beintensified by inorganic-organic fertilization, being of benefit to improving the physical and biological envi-ronment in the rhizosphere of wheat. Much more inorganic N was observed in the fertilized soils surroundingwheat roots than in the CK treatment, indicating the improvement of crop N supply in the rhisosphere ofwheat by fertilization.The activities of invertase, urease and protease in the root zone were greatly enhanced as compared tothose in the other parts of soils except that the urease activities were similar in the rhizo8phere and nonrhi-zosphere of the CK and pig manure treatments, indicating that invertase and protease could be produced bygrowing roots and rhizosphere microorganisms, in contrast to urease which could be stimulated by urea. Also,significant increment of these three enzyme activities in the rhizosphere of wheat by fertilizatioll, especially byapplication of chemical fertilizer combined with pig manurel suggested that fertilization not only acceleratedthe renewal of organic matter but also enhanced bioavailability of organic N in that soil zone. This couldbe the reason why the total amount of inorganic N available for plants was increased more obviously in therhizosphere of wheat of the fertilization treatments than in that of the CK treatment.

Keywords：

nitrogen; rhizosphere; soil enzyme; wheat;

Series：
(D) Agriculture
Subject：
Crop
Classification Code：
S512.106

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Responses of Nitrogen and Related Enzyme Activities toFertilization in Rhizosphere of WheatEnglish Full Text

YUAN LING;HUANG JIANGUO and YU SHANGQI(College of Natural Resources and Environment, Southwest Agricultural University, Chongqing 630716(China))(Equipment Division, Southwest Agricultural University, Chongqing 630716 (China))

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