Abstract
The cowpea is an important food crop in the North and Northeast regions of Brazil, where the beans are consumed either green or ripe. Yet, considering its socio-economic importance and its tropical origin, cowpea yields are low in those regions, due to inadequate cultivation practices and incorrect soil management. Therefore, the objective of this study was to study the development of cowpea crop inoculated and fertilized with two different nitrogen (N) sources. The experiment was conducted in the municipality of Rorainópolis (RR). The experimental design was randomized blocks with four treatments and five replications. The plant material was 'BRS Guariba' cowpea cultivar, and the treatments were: (i) control (no nitrogen fertilization), (ii) seeds inoculated with Bradyrhizobium elkanii, (iii) urea as N source (60 kg N ha-1), and (iv) ammonium sulphate as N source (60 kg N ha-1). The following crop traits were evaluated: foliar macronutrients (N, P, K, Ca, Mg and S), green and dry weight of shoots, dry beans per plant, pod yield and bean yield. Urea and ammonium sulphate promoted high accumulation of nutrients in leaves. Ammonium sulphate also stood out regarding productivity traits, thus proving to be a viable N source for cowpea in the Amazon region. The nodulation with Bradyrhizobium elkanii wasn't efficient to replace the fertilization with nitrogen fertilizers for cowpea BRS Guariba.
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Claims 4
Claim · model-written summary
Urea promoted high nutrient accumulation in cowpea leaves.
- Taxon
- cowpea
Vigna unguiculatat0 - Treatment
- Ureae0
- Outcome
- accumulation of nutrients in leavese0
- Direction
- highe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Urea and ammonium sulphate promoted high accumulation of nutrients in leaves.”
t0“cowpea”
Claim · model-written summary
Ammonium sulphate promoted high nutrient accumulation in cowpea leaves.
- Taxon
- cowpeaVigna unguiculatat0
- Treatment
- ammonium sulphatee0
- Outcome
- accumulation of nutrients in leavese0
- Direction
- highe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Urea and ammonium sulphate promoted high accumulation of nutrients in leaves.”
t0“cowpea”
Claim · model-written summary
Ammonium sulphate stood out for productivity traits.
- Taxon
- cowpeaVigna unguiculatat0
- Treatment
- Ammonium sulphatee0
- Outcome
- productivity traitse0
- Direction
- stood oute0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ammonium sulphate also stood out regarding productivity traits”
t0“cowpea”
Claim · model-written summary
Bradyrhizobium elkanii nodulation was inefficient at replacing nitrogen fertilizer for BRS Guariba cowpea.
- Taxon
- cowpeaVigna unguiculatae0
- Material
- BRS Guaribae0
- Treatment
- nodulation with Bradyrhizobium elkaniie0
- Interactor
- Bradyrhizobium elkaniiBradyrhizobium elkaniie0symbiont
- Outcome
- nodulation with Bradyrhizobium elkanii wasn't efficiente0
- Direction
- wasn't efficiente0
- Comparator
- fertilization with nitrogen fertilizerse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The nodulation with Bradyrhizobium elkanii wasn't efficient to replace the fertilization with nitrogen fertilizers for cowpea BRS Guariba.”
The same questions in other papers
ammonium sulfate · nutrient: content · Vigna unguiculata (cowpea)Results agree
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- positive
- positive
- positive
ammonium sulfate · yield · Vigna unguiculata (cowpea)Results agree
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nitrogen · nutrient: content · Vigna unguiculata (cowpea)Positive and negative results
9 papers in the same direction as this paper · 1 in the opposite direction
- negative
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7 papers more in this group
See all 11 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.