Abstract
African Crop Science Journal, 1997, Vol. 5. No. 1, pp. 87-92. SHORT COMMUNICATION Influence of molybdenum and cobalt fertilisation on symbiotic nitrogen fixation indicators in an oxisol in Uganda J.S. Tenywa Code Number: CS97011 Sizes of Files: Text: 16.2K Graphics: Tables (gif) - 17K ABSTRACT Molybdenum (Mo) and cobalt (Co) are important micro-elements involved in biological N2-fixation. Uganda has embarked on a campaign to increase the productivity of legume crops through utilisation of rhizobial inoculants, unfortunately, non-responsiveness is frequently encountered. Among the suspected causes are inadequacies of Mo and Co supply in the soil. A glasshouse study was, therefore, conducted with an Oxisol to examine this relationship. Treatments included provision of lime at 0 and 1.0 t ha^-1, Mo at 0, 390 and 780 g ha^-1 and Co at 0, 454 and 907 g ha^-1. Soybean (Glycine max Merrill) cultivar NAM.1 was the test crop. Cobalt application at a rate of 454 g ha^-1 resulted in the greatest nodulation and number of effective nodules per plant, as well as total N accumulation in the shoots. Liming depressed soil solution acidity by 0.2 pH units. A combination of lime (1 t CaCO3 ha^-1) and Co (454 g ha^-1) increased nodulation and the number of effective nodules per plant, but masked cobalt's positive effect on total N accumulation in shoots. Liming alone did not affect the biological N fixation indicators considered in this study. Key Words: Biological nitrogen fixation, inoculation, liming, soybean RESUME Le molybdene (Mo) et le Cobalt (Co) sont des micro-elements importants pour la fixation d'azote biologique. L'Ouganda mene une campagne pour elever la productivite des legumes en utilisant des inoculations Rhizobiales, mais souvent sans succes. Parmi les raisons possible, on a de quantites insuffisantes de Mo et Co dans le sol. Pour examiner cette relation, une etude a ete conduite dans la serre avec un Oxisol. On utilisait des concentrations sub-normales de la chaux, Mo et Co. Le soya (Glycine max Maerril), cultivar NAM.1 etait teste. L'application de 454 g/ha de Co resultait en une nodulation elevee et une augmentation du nombre de nodules effectives par plante, mais aussi dans l'accumulation d'azote totale. L'application de la chaux diminuait l'acidite du sol avec 0.2 unites de pH. Une combinaison de chaux (1 t CaCO3 /ha) et Co (454g/ha) augmente la nodulation et le nombre de nodules effectives par plante, mais masquait l'effet positive de l'accumulation de l'azote totale dans les pousses. L'application uniquement de la chaux n'influencait pas les indicateurs de fixation biologique N dans cette etude. Mots Cles: la fixation d'azote biologique, inoculation, chauler, le soya Copyright 1997 The African Crop Science Society
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Claims 6
Claim · model-written summary
Cobalt at 454 g ha^-1 gave the greatest nodulation and number of effective nodules per plant in soybean.
- Taxon
- Glycine max
Glycine maxe1 - Treatment
- Cobalt application at a rate of 454 g ha^-1e3
- Outcome
- nodulation and number of effective nodules per plante3
- Direction
- greateste3
- Setting
- glasshousee2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Soybean (Glycine max Merrill) cultivar NAM.1 was the test crop”
e2“A glasshouse study was, therefore, conducted with an Oxisol to examine this relationship”
e3“Cobalt application at a rate of 454 g ha^-1 resulted in the greatest nodulation and number of effective nodules per plant, as well as total N accumulation in the shoots”
Claim · model-written summary
Cobalt at 454 g ha^-1 gave the greatest total N accumulation in soybean shoots.
- Taxon
- Glycine maxGlycine maxe1
- Treatment
- Cobalt application at a rate of 454 g ha^-1e3
- Outcome
- total N accumulation in the shootse3
- Direction
- greateste3
- Setting
- glasshousee2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Soybean (Glycine max Merrill) cultivar NAM.1 was the test crop”
e2“A glasshouse study was, therefore, conducted with an Oxisol to examine this relationship”
e3“Cobalt application at a rate of 454 g ha^-1 resulted in the greatest nodulation and number of effective nodules per plant, as well as total N accumulation in the shoots”
Claim · model-written summary
A combination of lime and Co increased nodulation and the number of effective nodules per plant in soybean.
- Taxon
- Glycine maxGlycine maxe1
- Treatment
- A combination of lime (1 t CaCO3 ha^-1) and Co (454 g ha^-1)e4
- Outcome
- nodulation and the number of effective nodules per plante4
- Direction
- increasede4
- Setting
- glasshousee2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Soybean (Glycine max Merrill) cultivar NAM.1 was the test crop”
e2“A glasshouse study was, therefore, conducted with an Oxisol to examine this relationship”
e4“A combination of lime (1 t CaCO3 ha^-1) and Co (454 g ha^-1) increased nodulation and the number of effective nodules per plant, but masked cobalt's positive effect on total N accumulation in shoots”
Claim · model-written summary
The lime and Co combination masked the positive effect of cobalt on total N accumulation in soybean shoots.
- Taxon
- Glycine maxGlycine maxe1
- Treatment
- A combination of lime (1 t CaCO3 ha^-1) and Co (454 g ha^-1)e4
- Outcome
- total N accumulation in shootse4
- Direction
- maskede4
- Setting
- glasshousee2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Soybean (Glycine max Merrill) cultivar NAM.1 was the test crop”
e2“A glasshouse study was, therefore, conducted with an Oxisol to examine this relationship”
e4“A combination of lime (1 t CaCO3 ha^-1) and Co (454 g ha^-1) increased nodulation and the number of effective nodules per plant, but masked cobalt's positive effect on total N accumulation in shoots”
Claim · model-written summary
Liming depressed soil solution acidity by 0.2 pH units.
Not reportedTaxonComparator
Verbatim
e5“Liming depressed soil solution acidity by 0.2 pH units”
Claim · model-written summary
Liming alone did not affect the biological N fixation indicators in soybean.
- Taxon
- Glycine maxGlycine maxe1
- Treatment
- Liming alonee6
- Outcome
- biological N fixation indicatorse6
- Direction
- did not affecte6
- Setting
- glasshousee2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Soybean (Glycine max Merrill) cultivar NAM.1 was the test crop”
e2“A glasshouse study was, therefore, conducted with an Oxisol to examine this relationship”
e6“Liming alone did not affect the biological N fixation indicators considered in this study”
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