Abstract
Abstract Although common bean (Phaseolus vulgaris L.) has a good potential for N2 fixation, poor nodulation following inoculation, principally under field conditions, has led to increased nitrogen (N) fertilizer use in this crop. In the face of the negative environmental effects of N fertilizer, alternative methods have been studied to minimize the amount to be applied. In this sense, foliar application of molybdenum (Mo) has been cited as a promising method. Several papers show that high bean yields (1,500–2,500 kg ha‐1), may be obtained in the southeasten region of Brazil, when there is an application of N as side dressing or Mo spray 25 days after plant emergence. A field experiment was carried out to verify the effect of Mo foliar application on nitrogenase and nitrate reductase activities and on bean yield. Treatments included Rhizobium inoculation (with and without), foliar application of Mo (0 and 40 g ha‐1), N at planting (0 and 20 kg ha‐1) and N applied as side dressing (0 and 30 kg ha‐1). Molybdenum and N as side dressing were used 25 days after plant emergence. Molybdenum increased greatly the nitrogenase activity and extended the period of high nitrate reductase activity, with a consequent increase in total shoot N. Increase of nitrogenase activity did not depend on inoculation, showing that soil native rhizobia may increase in effectiveness when appropriately handled. Bean yield did not differ significantly when fertilized with either Mo or N as side dressing.
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Claims 6
Claim · model-written summary
Foliar molybdenum greatly increased nitrogenase activity.
- Taxon
- common beans
Phaseolus vulgarist0 - Treatment
- foliar application of Moe1
- Outcome
- nitrogenase activitye0
- Direction
- increasede0
- Comparator
- 0e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Molybdenum increased greatly the nitrogenase activity”
e1“foliar application of Mo (0 and 40 g ha‐1)”
t0“common beans”
Claim · model-written summary
Foliar molybdenum extended the period of high nitrate reductase activity.
- Taxon
- common beansPhaseolus vulgarist0
- Treatment
- foliar application of Moe1
- Outcome
- period of high nitrate reductase activitye0
- Direction
- extendede0
- Comparator
- 0e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Molybdenum increased greatly the nitrogenase activity and extended the period of high nitrate reductase activity”
e1“foliar application of Mo (0 and 40 g ha‐1)”
t0“common beans”
Claim · model-written summary
Foliar molybdenum increased total shoot nitrogen.
- Taxon
- common beansPhaseolus vulgarist0
- Treatment
- foliar application of Moe2
- Outcome
- total shoot Ne0
- Direction
- increasee0
- Comparator
- 0e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“with a consequent increase in total shoot N”
e1“Molybdenum increased greatly the nitrogenase activity”
e2“foliar application of Mo (0 and 40 g ha‐1)”
t0“common beans”
Claim · model-written summary
The molybdenum associated rise in nitrogenase activity did not depend on inoculation.
- Taxon
- common beansPhaseolus vulgarist0
- Outcome
- nitrogenase activitye0
RhizobiumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increase of nitrogenase activity did not depend on inoculation”
e1“Rhizobium inoculation (with and without)”
t0“common beans”
Claim · model-written summary
The authors inferred that native soil rhizobia may gain effectiveness with appropriate management.
- Taxon
- common beansPhaseolus vulgarist0
- Interactor
- rhizobiae0symbiont
- Outcome
- soil native rhizobia may increase in effectivenesse0
- Direction
- increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soil native rhizobia may increase in effectiveness when appropriately handled”
t0“common beans”
Claim · model-written summary
Bean yield did not differ significantly between molybdenum and nitrogen side dressing.
- Taxon
- common beanPhaseolus vulgarise1
- Treatment
- Moe0
- Outcome
- Bean yielde0
- Direction
- did not differe0
- Comparator
- N as side dressinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Bean yield did not differ significantly when fertilized with either Mo or N as side dressing”
e1“common bean (Phaseolus vulgaris L.)”
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