Abstract
Subsoiling a compacted soil should loosen it, improve the physical conditions, and increase nutrient availability and crop yields. The aim of this work is to compare the effects of different tillage and fertility treatments in a loamy Typic Hapludoll soil, and to determine the interactions of N fertilization with several soil properties and dryland corn (Zea mays L.) productivity. The experiment, conducted in 1995 and in 1997, had a split-plot design consisting of three tillage systems (MBamoldboard plowing, CHachisel plowing or NTano-tillage) in a corn‐soybean (Glycine max (L.) Merrill) rotation since 1991 as main treatments. Four subtreatments: (i) subsoil (paratill subsoiler to 40 cm depth in fallow 1995)aN fertilization (100 kg ha ˇ1 N as ammonium nitrate, at the V6 development stage of corn), (ii) subsoilano N fertilization, (iii) no subsoilingaN fertilization, and (iv) no subsoilingano N fertilization. Chemical and physical properties in the top layer of the soils were determined at seeding in 1995. Penetration resistance was measured at seeding, flowering and at harvest in 1995 and at seeding in 1997. Corn shoot dry matter during vegetative stages and grain yield components were also determined. The preparation of seedbed using either moldboard or chisel plowing with or without deep-tillage, increased the vegetative biomass by 27% and the grain yield of the corn crops by 9% over the no-tillage system. Subsoiling no-till plots improved the vegetative growth of the crops, but the effect of the deep-tillage did not modify the corn grain yields. Grain yields were strongly related to the N fertilization treatments. Although bulk density values (BD) ranged between 1.05 and 1.33 Mg m ˇ3 differences in crop yields were attributed to differences in the BD and the N fertilization. In the western Pampas Region of Argentina, the production of high yielding corn crops, under no water stress conditions, is independent of the tillage systems but negatively related with the soil BD values, and positively dependent on N fertilization. # 2000 Elsevier Science B.V. All rights reserved.
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Claims 9
Claim · model-written summary
Moldboard or chisel plowing increased corn vegetative biomass by 27% compared with no tillage.
- Taxon
- corn
Zea mays subsp. mayst0 - Treatment
- moldboard or chisel plowinge0
- Outcome
- vegetative biomasse0
- Direction
- increasede0
- Value
- 27%e0
- Comparator
- no-tillage systeme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The preparation of seedbed using either moldboard or chisel plowing with or without deep-tillage, increased the vegetative biomass by 27% and the grain yield of the corn crops by 9% over the no-tillage system.”
t0“dryland corn (Zea mays L.) productivity”
Claim · model-written summary
Moldboard or chisel plowing increased corn grain yield by 9% compared with no tillage.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- moldboard or chisel plowinge0
- Outcome
- grain yielde0
- Direction
- increasede0
- Value
- 9%e0
- Comparator
- no-tillage systeme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The preparation of seedbed using either moldboard or chisel plowing with or without deep-tillage, increased the vegetative biomass by 27% and the grain yield of the corn crops by 9% over the no-tillage system.”
Claim · model-written summary
Subsoiling no-till plots improved vegetative growth.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- Subsoiling no-till plotse0
- Outcome
- vegetative growthe0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Subsoiling no-till plots improved the vegetative growth of the crops, but the effect of the deep-tillage did not modify the corn grain yields.”
t0“dryland corn (Zea mays L.) productivity”
Claim · model-written summary
Deep tillage did not modify corn grain yield.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- deep-tillagee0
- Outcome
- corn grain yieldse0
- Direction
- did not modifye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Subsoiling no-till plots improved the vegetative growth of the crops, but the effect of the deep-tillage did not modify the corn grain yields.”
Claim · model-written summary
Grain yield was strongly related to nitrogen fertilization.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- N fertilization treatmentse0
- Outcome
- Grain yieldse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain yields were strongly related to the N fertilization treatments.”
t0“dryland corn (Zea mays L.) productivity”
Claim · model-written summary
Crop yields were attributed to differences in soil bulk density and nitrogen fertilization.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- N fertilizatione0
- Outcome
- crop yieldse0
- Qualifier
- differences in the BDe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Although bulk density values (BD) ranged between 1.05 and 1.33 Mg m ˇ3 differences in crop yields were attributed to differences in the BD and the N fertilization.”
t0“dryland corn (Zea mays L.) productivity”
Claim · model-written summary
Under no water stress, corn production was independent of tillage system.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- tillage systemse0
- Outcome
- production of high yielding corn cropse0
- Direction
- independente0
- Qualifier
- under no water stress conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the production of high yielding corn crops, under no water stress conditions, is independent of the tillage systems but negatively related with the soil BD values, and positively dependent on N fertilization.”
Claim · model-written summary
Under no water stress, corn production was negatively related to soil bulk density.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- production of high yielding corn cropse0
- Direction
- negatively relatede0
- Qualifier
- soil BD valuese0
- Setting
- western Pampas Region of Argentinae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the western Pampas Region of Argentina, the production of high yielding corn crops, under no water stress conditions, is independent of the tillage systems but negatively related with the soil BD values, and positively dependent on N fertilization.”
Claim · model-written summary
Under no water stress, corn production depended positively on nitrogen fertilization.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- N fertilizatione0
- Outcome
- production of high yielding corn cropse0
- Direction
- positively dependente0
- Qualifier
- under no water stress conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the production of high yielding corn crops, under no water stress conditions, is independent of the tillage systems but negatively related with the soil BD values, and positively dependent on N fertilization.”
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See all 1,099 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.