The role of nitrogen forms on solubilisation and utilisation of rock phosphate by tomato plants

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dc.contributor.authorOnyango, Gweyi
dc.contributor.authorNeumann, G.
dc.contributor.authorRomheld, V.
dc.date.accessioned2014-10-16T08:44:30Z
dc.date.available2014-10-16T08:44:30Z
dc.date.issued2005
dc.description.abstractThe role of nitrogen forms on solubilisation and utilisation of rock phosphate was investigated on tomato (Lycopersicon esculentum) crops grown in minirhizotrons to assess root-induced chemical changes in the rhizosphere. Two tomato cultivars Cal-J and Moneymaker were supplied with rock phosphate as P source, ammonium (plus DIDIN-nitrification inhibitor) and nitrate as Nforms.NH4+ treatment significantly reduced rhizosphere pH while nitrate led to alkanization. Shoot P content increased with declining rhizosphere pH due to rock phosphate solubilisation. P nutrition was sufficient for NH4-N (intense rhizosphere acidification) but critical under NO3- supply. Shoot Ca contents were in the deficiency range under NH4+ supply, despite increased Ca availability due to rock phosphate solubilisation. Also Mg2+ and K+ uptake declined with decreasing rhizosphere pH. These findings suggest NH4 + and H+ competition with cation uptake, limiting shoot growth. Acid soils low in Ca and Mg, NH4 + in combination with NO3- may improve rock phosphate utilisationen_US
dc.identifier.citationAfrican Crop Science Conference Proceedings, Vol. 7. pp. 1029-1032 2005en_US
dc.identifier.issn1023-070X
dc.identifier.issnuri:http://www.acss.ws/Upload/XML/Research/651.pdf
dc.identifier.urihttp://ir-library.ku.ac.ke/handle/123456789/11470
dc.language.isoenen_US
dc.publisherAfrican Crop Science Societyen_US
dc.subjectAmmoniumen_US
dc.subjectnitrateen_US
dc.subjectrock phosphateen_US
dc.subjecttomato cultivarsen_US
dc.titleThe role of nitrogen forms on solubilisation and utilisation of rock phosphate by tomato plantsen_US
dc.typeArticleen_US
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