Effects of arbuscular mycorrhizal fungal species (Glomus aggregatum and Acaulospora spinosa), nitrogen and phosphorus fertilizers on maize growth, root colonization and spore production
2004
Pitakdantham, R.(Kasetsart University. Bangkhen Campus, Bangkok (Thailand). Faculty of Agriculture. Department of Soil Science) | Suwanarit, A.(Kasetsart University. Bangkhen Campus, Bangkok (Thailand). Faculty of Agriculture. Department of Soil Science) E-mail:[email protected] | Suwanarit, P.(Kasetsart University. Bangkhen Campus, Bangkok (Thailand). Faculty of Science. Department of Microbiology) | Leyval, C.(Universite Henri Poincare, Nancy I (France). Laboratoire des Interactions Microorganismes-Mineraux-Matiere Organique dans les Sols) | Sarobol, E.(Kasetsart University. Bangkhen Campus, Bangkok (Thailand). Faculty of Agriculture. Department of Agronomy) | Nopamornbodi, O.(Department of Agriculture, Bangkok (Thailand)) | Hoefner, W.(Justus-Liebig University, Giessen (Germany). Previously Institute of Plant Nutrition)
Pot experiment was carried out with sterilized Pak Chong soil series (Rhodic Kandiustox, very fine, kaolinitic, isohyperthermic) to examine effects of nitrogen (N) and phosphorus (P) fertilizers on the efficacy of two arbuscular mycorrhizal fungi (AMF) in promoting maize (Zea mays L. cv. Suwan 2) growth and on the colonization and spore production of the fungi. The fungi studied were Acaulospora spinosa and Glomus aggregatum. G. aggregatum was more effective than A. spinosa in enhancing growth and development of maize. The growth promotion effect decreased with increased rates of P fertilizer. Different AMF species required different N:P ratios to attain their maximum root colonization and spore production. For each AMF species, different N:P ratios were required to attain its maximum root colonization and to atain its maximum spore production. To produce maximum root colonization, A. spinosa required lower N:P ratio than G. aggregatum but to produce maximum spore production it required higher N:P ratio than G. aggregatum. G. aggregatum showed high positive correlation between root colonization and spore production whereas A. spinosa did not show such relationship. No significant relationship was observed between degree of root colonization and maize dry matter yield and between maize dry matter yield and spore intensity in the soil.
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