Abstract
Cassava (Manihot esculenta Crantz) is an easy to manage crop with good tolerance to drought and low-fertility soils. Although chemical fertilization is known to improve cassava yield, little is known about the potential of legume green manures to enhance soil chemical properties and consequently increase crop production. Here we analyze how different legume green manures affect cassava root growth and soil quality in an oxisol from northern Brazil. In this field study, we evaluated the effect of four green manure treatments (no fertilization, Crotalaria, jack bean, and cowpea) on soil exchangeable cation contents, pH H2O, pH KCl, ΔpH, exchangeable aluminum, sum of bases (SB), cation-exchange capacity (CEC), soil organic carbon (SOC), plant diameter, plant height, and root yield. Cowpea treatment was the most effective in increasing exchangeable cations, CEC, SB, and root yield, whereas jack bean treatment increased acid cations and SOC. A hierarchy of exchangeable cations was observed, Ca2+>Mg2+>K+, a result likely associated with nutrient absorption by cassava plants. Plant diameter had a positive linear correlation with root yield. Overall, our results indicate that green fertilization positively influences SOC, minimizing the depletion of exchangeable cations and thereby preventing yield losses. Cowpea treatment, however, acted more broadly on the variables studied
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 8
Claim · model-written summary
Cowpea green manure increased exchangeable cations, CEC and SB in the cassava field study.
- Taxon
- Cassava
Manihot esculentae0 - Treatment
- Cowpea treatmente1
- Outcome
- exchangeable cations, CEC, SBe1
- Direction
- increasinge1
- Setting
- oxisol from northern Brazile3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cassava (Manihot esculenta Crantz) is an easy to manage crop with good tolerance to drought and low-fertility soils”
e1“Cowpea treatment was the most effective in increasing exchangeable cations, CEC, SB, and root yield”
e3“Here we analyze how different legume green manures affect cassava root growth and soil quality in an oxisol from northern Brazil”
Claim · model-written summary
Cowpea green manure increased cassava root yield in the field study.
- Taxon
- CassavaManihot esculentae0
- Treatment
- Cowpea treatmente1
- Outcome
- root yielde1
- Direction
- increasinge1
- Setting
- oxisol from northern Brazile3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cassava (Manihot esculenta Crantz) is an easy to manage crop with good tolerance to drought and low-fertility soils”
e1“Cowpea treatment was the most effective in increasing exchangeable cations, CEC, SB, and root yield”
e3“Here we analyze how different legume green manures affect cassava root growth and soil quality in an oxisol from northern Brazil”
Claim · model-written summary
Jack bean green manure increased acid cations and soil organic carbon.
- Taxon
- CassavaManihot esculentae0
- Treatment
- jack bean treatmente2
- Outcome
- acid cations and SOCe2
- Direction
- increasede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cassava (Manihot esculenta Crantz) is an easy to manage crop with good tolerance to drought and low-fertility soils”
e2“jack bean treatment increased acid cations and SOC”
Claim · model-written summary
A hierarchy of exchangeable cations, Ca2+>Mg2+>K+, was observed in the cassava field soil.
- Taxon
- CassavaManihot esculentae0
- Outcome
- hierarchy of exchangeable cationse4
- Qualifier
- likely associated with nutrient absorption by cassava plantse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cassava (Manihot esculenta Crantz) is an easy to manage crop with good tolerance to drought and low-fertility soils”
e4“A hierarchy of exchangeable cations was observed, Ca2+>Mg2+>K+”
e5“a result likely associated with nutrient absorption by cassava plants”
Claim · model-written summary
Plant diameter had a positive linear correlation with cassava root yield.
- Taxon
- CassavaManihot esculentae0
- Treatment
- Plant diametere6
- Outcome
- root yielde6
- Direction
- positivee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cassava (Manihot esculenta Crantz) is an easy to manage crop with good tolerance to drought and low-fertility soils”
e6“Plant diameter had a positive linear correlation with root yield”
Claim · model-written summary
Green fertilization positively influenced soil organic carbon in the cassava field study.
- Taxon
- CassavaManihot esculentae0
- Treatment
- green fertilizatione7
- Outcome
- SOCe7
- Direction
- positively influencese7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cassava (Manihot esculenta Crantz) is an easy to manage crop with good tolerance to drought and low-fertility soils”
e7“green fertilization positively influences SOC, minimizing the depletion of exchangeable cations and thereby preventing yield losses”
Claim · model-written summary
Green fertilization minimized the depletion of exchangeable cations and was thought to prevent cassava yield losses.
- Taxon
- CassavaManihot esculentae0
- Treatment
- green fertilizatione7
- Outcome
- depletion of exchangeable cationse7
- Direction
- minimizinge7
- Qualifier
- thereby preventing yield lossese7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cassava (Manihot esculenta Crantz) is an easy to manage crop with good tolerance to drought and low-fertility soils”
e7“green fertilization positively influences SOC, minimizing the depletion of exchangeable cations and thereby preventing yield losses”
Claim · model-written summary
Cowpea treatment acted more broadly on the soil and plant variables studied than the other treatments.
- Taxon
- CassavaManihot esculentae0
- Treatment
- Cowpea treatmente1
- Outcome
- variables studiede1
- Direction
- acted more broadlye1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cassava (Manihot esculenta Crantz) is an easy to manage crop with good tolerance to drought and low-fertility soils”
e1“Cowpea treatment, however, acted more broadly on the variables studied”
The same questions in other papers
Vigna unguiculata · yield · Manihot esculenta (cassava)Positive and negative results
12 papers in the same direction as this paper · 6 in the opposite direction · 1 reporting no difference from an alternative
- negative
- negative
- no effect
16 papers more in this group
See all 20 papers →fertilization · molecular: metabolites · Manihot esculenta (cassava)Results differ
10 papers in the same direction as this paper · 6 in the opposite direction
- negative
- negative
- no effect
13 papers more in this group
See all 17 papers →fertilization · soil: chemistry · Manihot esculenta (cassava)Positive and negative results
5 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- positive
3 papers more in this group
See all 7 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.