| Effect of partial root-zone irrigation on soil micro-organism and maize water utilize under combined application of organic and inorganic fertilizers |
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| DOI：10.7606/j.issn.1000-7601.2008.06.12 |
| Key Words: partial root-zone irrigation combined application of organic and inorganic fertilizer soil microorganism water use rate |
| Author Name | Affiliation | | YU Jiangmin | gricultural College Guangxi University, Nanning, Guangxi 530005, China | | LI Fusheng | Agricultural College Guangxi University, Nanning, Guangxi 530005, China；KeyL aboratory for Agricultural Soil and Water Engineering in Arid Area of Education,Yangling, Shaanxi 712100, China | | WEI Caihui | gricultural College Guangxi University, Nanning, Guangxi 530005, China | | LI Zhijun | Key Laboratory for Agricultural Soil and Water Engineering in Arid Area of Education,Yangling, Shaanxi 712100, China |
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| Abstract: |
| A pot experiment was carried out to study the effects of three kinds of water irrigation,i.e.conventional irrigation(CI),fixed partial root-zone irrigation(FPRI) and alternate partial root-zone irrigation(APRI) on the number of soil microorganism and maize water use under different combined application of organic and inorganic fertilizer.The results showed that the combined application of organic and inorganic fertilizer increased the number of soil microorganism which,however,did not keep on increasing with the increase of the use ratio of organic fertilizer.Under the same irrigation treatment,60% inorganic fertilizer combined with 40% organic manure treatment increased the number of soil bacteria,fungi and actinomycetes in jointing,booting and filling stage than other treatments.While under the same fertilization level treatment,the number of soil bacteria,fungi and actinomycetes in APRI and FPRI treatments were higher than CI treatment.Compared with CI treatment,FPRI and APRI treatments average saved irrigation water by 14.7% and 16.9%,and water use rate increased by 20.0% and 10.4%.Above results showed that partial root-zone irrigation(PRI) created a good soil biological environment,promoted the metabolism and reproduction of the microorganism,the number of soil microorganisms,and saved irrigation water use amount and raised water utilizing rate. |
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