Abstract
Vegetable production in conservation tillage has increased in Brazil, with positive effects on the soil quality. Since management systems alter the quantity and quality of organic matter, this study evaluated the influence of different management systems and cover crops on the organic matter dynamics of a dystrophic Red Latosol under vegetables. The treatments consisted of the combination of three soil tillage systems: no-tillage (NT), reduced tillage (RT) and conventional tillage (CT) and of two cover crops: maize monoculture and maize-mucuna intercrop. Vegetables were grown in the winter and the cover crops in the summer for straw production. The experiment was arranged in a randomized block design with four replications. Soil samples were collected between the crop rows in three layers (0.0-0.05, 0.05-0.10, and 0.10-0.30 m) twice: in October, before planting cover crops for straw, and in July, during vegetable cultivation. The total organic carbon (TOC), microbial biomass carbon (MBC), oxidizable fractions, and the carbon fractions fulvic acid (C FA), humic acid (C HA) and humin (C HUM) were determined. The main changes in these properties occurred in the upper layers (0.0-0.05 and 0.05-0.10 m) where, in general, TOC levels were highest in NT with maize straw. The MBC levels were lowest in CT systems, indicating sensitivity to soil disturbance. Under mucuna, the levels of C HA were lower in RT than NT systems, while the C FA levels were lower in RT than CT. For vegetable production, the C HUM values were lowest in the 0.05-0.10 m layer under CT. With regard to the oxidizable fractions, the tillage systems differed only in the most labile C fractions, with higher levels in NT than CT in the 0.0-0.05 m layer in both summer and winter, with no differences between these systems in the other layers. The cabbage yield was not influenced by the soil management system, but benefited from the mulch production of the preceding maize-mucuna intercrop as cover plant.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by. 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
Total organic carbon in the upper soil layers was highest under no-tillage with maize straw.
- Taxon
- vegetablest0
- Treatment
- NT with maize strawe1
- Outcome
- TOC levelse1
- Direction
- higheste1
- Qualifier
- upper layers (0.0-0.05 and 0.05-0.10 m)e1
Not reportedComparator
Verbatim
t0“Effect of management systems and cover crops on organic matter dynamics of soil under vegetables”
e1“The main changes in these properties occurred in the upper layers (0.0-0.05 and 0.05-0.10 m) where, in general, TOC levels were highest in NT with maize straw”
Claim · model-written summary
Microbial biomass carbon was lowest under conventional tillage.
- Taxon
- vegetablest0
- Treatment
- CT systemse1
- Outcome
- MBC levelse1
- Direction
- loweste1
- Qualifier
- indicating sensitivity to soil disturbancee1
Not reportedComparator
Verbatim
t0“Effect of management systems and cover crops on organic matter dynamics of soil under vegetables”
e1“The MBC levels were lowest in CT systems, indicating sensitivity to soil disturbance”
Claim · model-written summary
Under mucuna, the C HA level was lower under reduced tillage than under no-tillage.
Verbatim
t0“Effect of management systems and cover crops on organic matter dynamics of soil under vegetables”
e1“Under mucuna, the levels of C HA were lower in RT than NT systems, while the C FA levels were lower in RT than CT”
Claim · model-written summary
Under mucuna, the C FA level was lower under reduced tillage than under conventional tillage.
Verbatim
t0“Effect of management systems and cover crops on organic matter dynamics of soil under vegetables”
e1“Under mucuna, the levels of C HA were lower in RT than NT systems, while the C FA levels were lower in RT than CT”
Claim · model-written summary
C HUM values were lowest in the 0.05-0.10 m layer under conventional tillage in vegetable production.
Not reportedComparator
Verbatim
t0“Effect of management systems and cover crops on organic matter dynamics of soil under vegetables”
e1“For vegetable production, the C HUM values were lowest in the 0.05-0.10 m layer under CT”
Claim · model-written summary
The most labile carbon fractions were higher under no-tillage than under conventional tillage in the 0.0-0.05 m layer in both summer and winter.
Verbatim
t0“Effect of management systems and cover crops on organic matter dynamics of soil under vegetables”
e1“the tillage systems differed only in the most labile C fractions, with higher levels in NT than CT in the 0.0-0.05 m layer in both summer and winter”
Claim · model-written summary
Cabbage yield was not influenced by the soil management system.
- Taxon
- cabbage
Brassica oleracea var. capitatae1 - Treatment
- soil management systeme1
- Outcome
- cabbage yielde1
- Direction
- not influencede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Effect of management systems and cover crops on organic matter dynamics of soil under vegetables”
e1“The cabbage yield was not influenced by the soil management system”
Claim · model-written summary
Cabbage yield benefited from the mulch of the preceding maize-mucuna intercrop used as cover plant.
- Taxon
- cabbageBrassica oleracea var. capitatae1
- Treatment
- mulch production of the preceding maize-mucuna intercrope2
- Outcome
- cabbage yielde1
- Direction
- benefitede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Effect of management systems and cover crops on organic matter dynamics of soil under vegetables”
e1“The cabbage yield was not influenced by the soil management system”
e2“but benefited from the mulch production of the preceding maize-mucuna intercrop as cover plant”
The same questions in other papers
mulching · yield · Brassica oleracea (wild cabbage)Results differ
48 papers in the same direction as this paper · 10 in the opposite direction · 2 reporting no difference from an alternative
- negative
- no effect
- no effect
57 papers more in this group
See all 61 papers →cultivation system · yield · Brassica oleracea (wild cabbage)Positive and negative results
5 papers in the same direction as this paper · 8 in the opposite direction
- positive
- positive
- positive
10 papers more in this group
See all 14 papers →intercropping · yield · Brassica oleracea (wild cabbage)Positive and negative results
34 papers in the same direction as this paper · 5 in the opposite direction · 3 reporting no difference from an alternative
- negative
- no effect
- no effect
39 papers more in this group
See all 43 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.