Abstract
Decomposing crop residues in no-tillage system can alter soil chemical properties, which may consequently influence the productivity of succession crops. The objective of this study was to evaluate soil chemical properties and soybean, maize and rice yield, grown in the summer, after winter crops in a no-tillage system. The experiment was carried out in Jaboticabal, SP, Brazil (21 ° 15 ' 22 '' S; 48 ° 18 ' 58 '' W) on a Red Latosol (Oxisol), in a completely randomized block design, in strip plots with three replications. The treatments consisted of four summer crop sequences (maize monocrop, soybean monocrop, soybean/maize rotation and rice/bean/cotton rotation) combined with seven winter crops (maize, sunflower, oilseed radish, pearl millet, pigeon pea, grain sorghum and sunn hemp). The experiment began in September 2002. After the winter crops in the 2005/2006 growing season and before the sowing of summer crops in the 2006/2007 season, soil samples were collected in the layers 0-2.5; 2.5-5.0; 5-10; 10-20; and 20-30 cm. Organic matter, pH, P, K+, Ca2+, Mg2+, and H + Al were determined in each soil sample. In the summer soybean/maize rotation and in maize the organic matter contents and P levels were lower, in the layers 0-10 cm and 0-20 cm, respectively. Summer rice/bean/cotton rotation increased soil K levels at 0-10 cm depth when sunn hemp and oilseed radish had previously been grown in the winter, and in the 0-2.5 cm layer for millet. Sunn hemp, millet, oilseed radish and sorghum grown in the winter increased organic matter contents in the soil down to 30 cm. Higher P levels were found at the depths 0-2.5 cm and 0-5 cm, respectively, when sunn hemp and oilseed radish were grown in the winter. Highest grain yields for soybean in monoculture were obtained in succession to winter oilseed radish and sunn hemp and in rotation with maize, after oilseed radish, sunn hemp and millet. Maize yields were highest in succession to winter oilseed radish, millet and pigeon pea. Rice yields were lowest when grown after sorghum.
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Claims 10
Claim · model-written summary
Summer soybean/maize rotation and maize had lower soil organic matter and phosphorus levels at specified depths.
- Taxon
- soybean/maize
Glycine max
Zea mayse0 - Outcome
- organic matter contents and P levelse0
- Direction
- lowere0
- Setting
- 0-10 cm and 0-20 cme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the summer soybean/maize rotation and in maize the organic matter contents and P levels were lower, in the layers 0-10 cm and 0-20 cm, respectively.”
Claim · model-written summary
Rice/bean/cotton rotation after sunn hemp and oilseed radish increased soil potassium at 0-10 cm.
- Taxon
- rice/bean/cottone0
- Treatment
- sunn hemp and oilseed radishe0
- Outcome
- soil K levelse0
- Direction
- increasede0
- Setting
- 0-10 cm depthe0
Not reportedComparator
Verbatim
e0“Summer rice/bean/cotton rotation increased soil K levels at 0-10 cm depth when sunn hemp and oilseed radish had previously been grown in the winter”
Claim · model-written summary
Rice/bean/cotton rotation after millet increased soil potassium in the 0-2.5 cm layer.
- Taxon
- rice/bean/cottone0
- Treatment
- millete0
- Outcome
- soil K levelse0
- Direction
- increasede0
- Setting
- 0-2.5 cm layere0
Not reportedComparator
Verbatim
e0“Summer rice/bean/cotton rotation increased soil K levels at 0-10 cm depth when sunn hemp and oilseed radish had previously been grown in the winter, and in the 0-2.5 cm layer for millet.”
Claim · model-written summary
Winter sunn hemp, millet, oilseed radish and sorghum increased soil organic matter down to 30 cm.
- Taxon
- soybean, maize and riceGlycine max
Oryza sativaZea mayst0 - Treatment
- Sunn hemp, millet, oilseed radish and sorghume0
- Outcome
- organic matter contents in the soile0
- Direction
- increasede0
- Setting
- down to 30 cme0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sunn hemp, millet, oilseed radish and sorghum grown in the winter increased organic matter contents in the soil down to 30 cm.”
t0“soybean, maize and rice”
Claim · model-written summary
Winter sunn hemp produced higher soil phosphorus at 0-2.5 cm.
- Taxon
- soybean, maize and riceGlycine maxOryza sativaZea mayst0
- Treatment
- sunn hempe0
- Outcome
- P levelse0
- Direction
- Highere0
- Setting
- 0-2.5 cme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Higher P levels were found at the depths 0-2.5 cm and 0-5 cm, respectively, when sunn hemp and oilseed radish were grown in the winter.”
t0“soybean, maize and rice”
Claim · model-written summary
Winter oilseed radish produced higher soil phosphorus at 0-5 cm.
- Taxon
- soybean, maize and riceGlycine maxOryza sativaZea mayst0
- Treatment
- oilseed radishe0
- Outcome
- P levelse0
- Direction
- Highere0
- Setting
- 0-5 cme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Higher P levels were found at the depths 0-2.5 cm and 0-5 cm, respectively, when sunn hemp and oilseed radish were grown in the winter.”
t0“soybean, maize and rice”
Claim · model-written summary
Soybean monoculture yielded most after winter oilseed radish and sunn hemp.
- Taxon
- soybeanGlycine maxe0
- Treatment
- winter oilseed radish and sunn hempe0
- Outcome
- grain yieldse0
- Direction
- Higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Highest grain yields for soybean in monoculture were obtained in succession to winter oilseed radish and sunn hemp”
Claim · model-written summary
Soybean in rotation with maize yielded most after oilseed radish, sunn hemp and millet.
- Taxon
- soybeanGlycine maxe0
- Treatment
- oilseed radish, sunn hemp and millete0
- Outcome
- grain yieldse0
- Direction
- Higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Highest grain yields for soybean in monoculture were obtained in succession to winter oilseed radish and sunn hemp and in rotation with maize, after oilseed radish, sunn hemp and millet.”
Claim · model-written summary
Maize yields were highest after winter oilseed radish, millet and pigeon pea.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maize yields were highest in succession to winter oilseed radish, millet and pigeon pea.”
Claim · model-written summary
Rice yields were lowest after sorghum.
- Taxon
- RiceOryza sativae0
- Treatment
- sorghume0
- Outcome
- Rice yieldse0
- Direction
- loweste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice yields were lowest when grown after sorghum.”
The same questions in other papers
Crotalaria juncea · nutrient: content · Oryza sativa (rice)Results agree
1 paper in the same direction as this paper
- positive
Raphanus sativus · nutrient: content · Gossypium hirsutum (cotton)Results agree
1 paper in the same direction as this paper
- positive
Crotalaria juncea · nutrient: content · Gossypium hirsutum (cotton)Results agree
2 papers in the same direction as this paper
- positive
- positive
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.