Abstract
Cowpea [Vigna unguiculata (L) Walp] have great social and economic importance for the Para State. It grows well in areas with low precipitation and two crop cycles can be obtained annually. This study aimed to assess the effect of the residual fertilization from a previous culture (Sorghum bicolor L. Moench) and crop systems on cowpea yield and macronutrient concentration on leaves of three cowpea cultivars (BRSMilênio, BRS-Urubuquara e BRS-Guariba). The study was conducted at the UFRA. The treatments were two crop systems (minimum tillage and conventional), four levels of potassium (50, 100, 200 e 300 kg de KCl ha-1 applied to a previous sorghum culture) and the three cowpea cultivars. Treatments were organized as a three (4 x 2 x 3) factor experiment on a randomized complete block design. The soil was a yellow latosol. In each experiment plot five plants were selected to determine shoot dry matter and foliar nutrient concentration. Grain yield was determined after harvesting all plants on the experiment plot. The residual KCl fertilization affected foliar nutrient content, but did not affect shoot dry mass or yield of grain. Yield was higher in the minimum tillage system. Highest yield (1590 kg ha-1) was recorded int the cv. 'Guariba' when 100 kg of KCl ha-1 had been used in the previous crop. The highest content of leaf N and K was found in cowpea under minimum tillage system. The amount of P and Mg were higher in the conventional system whereas the amount of Ca did not change.
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Claims 10
Claim · model-written summary
Residual KCl fertilization affected cowpea foliar nutrient content.
Not reportedTaxonComparator
Verbatim
e0“The residual KCl fertilization affected foliar nutrient content”
Claim · model-written summary
Residual KCl fertilization did not affect cowpea shoot dry mass.
Not reportedTaxonComparator
Verbatim
e0“residual KCl fertilization affected foliar nutrient content, but did not affect shoot dry mass or yield of grain”
Claim · model-written summary
Residual KCl fertilization did not affect cowpea grain yield.
Not reportedTaxonComparator
Verbatim
e0“residual KCl fertilization affected foliar nutrient content, but did not affect shoot dry mass or yield of grain”
Claim · model-written summary
Cowpea yield was higher under minimum tillage.
Not reportedTaxonComparator
Verbatim
e0“Yield was higher in the minimum tillage system”
Claim · model-written summary
Guariba had the highest yield, 1590 kg ha-1, after the previous crop received 100 kg of KCl ha-1.
Not reportedTaxon
Verbatim
e0“Highest yield (1590 kg ha-1) was recorded int the cv. 'Guariba' when 100 kg of KCl ha-1 had been used in the previous crop”
Claim · model-written summary
Minimum tillage had the highest cowpea leaf N content.
- Taxon
- cowpea
Vigna unguiculatae0 - Treatment
- minimum tillage systeme0
- Outcome
- leaf Ne0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“highest content of leaf N and K was found in cowpea under minimum tillage system”
Claim · model-written summary
Minimum tillage had the highest cowpea leaf K content.
- Taxon
- cowpeaVigna unguiculatae0
- Treatment
- minimum tillage systeme0
- Outcome
- Ke0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“highest content of leaf N and K was found in cowpea under minimum tillage system”
Claim · model-written summary
Conventional tillage had higher cowpea leaf P content.
Not reportedTaxonComparator
Verbatim
e0“The amount of P and Mg were higher in the conventional system”
Claim · model-written summary
Conventional tillage had higher cowpea leaf Mg content.
Not reportedTaxonComparator
Verbatim
e0“The amount of P and Mg were higher in the conventional system”
Claim · model-written summary
Cowpea leaf Ca amount did not change between tillage systems.
Not reportedTaxonTreatmentComparator
Verbatim
e0“amount of Ca did not change”
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