Abstract
ABSTRACT Sudan grass (Sorghum sudanense (Piper) Stapf.) shows potential as a cover crop under the no-tillage system in soybean growing under the conditions of the Brazilian Cerrado region, due to high biomass production under water deficit. The large amount of biomass produced can improve soil microbiological activity, but may also negatively affect subsequent soybean yield due to nutrient competition, particularly if termination of the cover crop is delayed. To improves the use of Sudan grass as a cover crop, this study aimed to evaluate the most suitable time for terminating Sudan grass to balance the maintenance of soil biological quality and increased soybean yield. Experiment was conducted in a randomized block design, with four replications, evaluating six cutting times for Sudan grass: 150, 120, 90, 60, 30, and 7 days before soybean sowing (DBSS). Early cutting of Sudan grass did not negatively affect soil biological properties; cutting at 150 DBSS led to a significant (p≤0.05) increase in microbial biomass carbon (111 mg kg -1 ) and the microbial quotient (41 mg kg -1 ). In addition, early cutting at 150 DBSS increased the concentration of S-SO 4 2- in the soil (13 mg dm -3 ). Early cutting at 150, 98, and 67 DBSS led to increases in soybean foliar concentrations of Cu (12 mg kg -1 ), P (4.11 g kg -1 ), and K (24 g kg -1 ), respectively. However, these increases in soybean foliar concentrations did not result in higher grain yield, 1000-seed weight, or grain protein content. Therefore, Sudan grass can be incorporated as a cover crop in a no-tillage system in the soybean off-season in the northeastern Cerrado region of Brazil. It is possible to cut the Sudan grass up to 7 days before sowing soybean without harmful effects on soybean yield. However, early cutting of Sudan grass is recommended to increase the efficiency of carbon incorporation into the microbial biomass.
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Claims 9
Claim · model-written summary
Cutting Sudan grass at 150 days before soybean sowing increased soil microbial biomass carbon to 111 mg kg -1.
- Taxon
- soybean
Glycine maxt0 - Treatment
- cutting at 150 DBSSe0
- Outcome
- microbial biomass carbone0
- Direction
- increasee0
- Value
- 111 mg kg -1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cutting at 150 DBSS led to a significant (p≤0.05) increase in microbial biomass carbon (111 mg kg -1 )”
t0“soybean”
Claim · model-written summary
Cutting at 150 days before sowing increased the soil microbial quotient to 41 mg kg -1.
- Taxon
- soybeanGlycine maxt0
- Treatment
- cutting at 150 DBSSe0
- Outcome
- microbial quotiente0
- Direction
- increasee0
- Value
- 41 mg kg -1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cutting at 150 DBSS led to a significant (p≤0.05) increase in microbial biomass carbon (111 mg kg -1 ) and the microbial quotient (41 mg kg -1 )”
t0“soybean”
Claim · model-written summary
Cutting at 150 days before sowing increased soil sulfate concentration to 13 mg dm -3.
- Taxon
- soybeanGlycine maxt0
- Treatment
- early cutting at 150 DBSSe0
- Outcome
- concentration of S-SO 4 2- in the soile0
- Direction
- increasede0
- Value
- 13 mg dm -3e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“early cutting at 150 DBSS increased the concentration of S-SO 4 2- in the soil (13 mg dm -3 )”
t0“soybean”
Claim · model-written summary
Early cutting at 150 days before sowing increased soybean foliar Cu to 12 mg kg -1.
- Taxon
- soybeanGlycine maxe0
- Treatment
- Early cutting at 150e0
- Outcome
- soybean foliar concentrations of Cue0
- Direction
- increasese0
- Value
- 12 mg kg -1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Early cutting at 150, 98, and 67 DBSS led to increases in soybean foliar concentrations of Cu (12 mg kg -1 ), P (4.11 g kg -1 ), and K (24 g kg -1 ), respectively”
Claim · model-written summary
Early cutting at 98 days before sowing increased soybean foliar P to 4.11 g kg -1.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Early cutting at 150, 98, and 67 DBSS led to increases in soybean foliar concentrations of Cu (12 mg kg -1 ), P (4.11 g kg -1 ), and K (24 g kg -1 ), respectively”
Claim · model-written summary
Early cutting at 67 days before sowing increased soybean foliar K to 24 g kg -1.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Early cutting at 150, 98, and 67 DBSS led to increases in soybean foliar concentrations of Cu (12 mg kg -1 ), P (4.11 g kg -1 ), and K (24 g kg -1 ), respectively”
Claim · model-written summary
Early cutting did not increase soybean grain yield, thousand-seed weight or grain protein content.
- Taxon
- soybeanGlycine maxe0
- Treatment
- Early cutting at 150, 98, and 67 DBSSe1
- Outcome
- grain yield, 1000-seed weight, or grain protein contente0
- Direction
- did not result in highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“these increases in soybean foliar concentrations did not result in higher grain yield, 1000-seed weight, or grain protein content”
e1“Early cutting at 150, 98, and 67 DBSS”
Claim · model-written summary
Sudan grass can be cut as late as seven days before soybean sowing without harming soybean yield.
- Taxon
- soybeanGlycine maxe0
- Outcome
- cut the Sudan grass up to 7 days before sowing soybean without harmful effects on soybean yielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It is possible to cut the Sudan grass up to 7 days before sowing soybean without harmful effects on soybean yield”
Claim · model-written summary
Early cutting of Sudan grass is recommended to improve carbon incorporation into microbial biomass.
- Taxon
- soybeanGlycine maxt0
- Outcome
- early cutting of Sudan grass is recommended to increase the efficiency of carbon incorporation into the microbial biomasse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“early cutting of Sudan grass is recommended to increase the efficiency of carbon incorporation into the microbial biomass”
t0“soybean”
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See all 8 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.