Abstract
Although tillage systems produce different soil conditions, which result in different ideal planting dates, and crops respond to planting date, most of tillage research is conducted based on a calendar date. If a tillage system by planting date interaction exists, most of the planting date recommendations based on calendar date research could change. Different authors have modified surface residue distribution in an attempt to achieve optimal soil conditions for crop growth in the row zone while maintaining optimum soil conservation conditions in the mulched interrow zone. A reasonable goal for soil management involves identifying the level of soil and residue disturbance necessary to optimize soil environmental conditions for the corn plant and residue cover for soil conservation. In order to design a tillage system that produces a residue-free band-width based on site-specific soil properties and crop needs, the use of a model to capture the effect of surface residue management, soil non-uniformities (i.e., row zone tillage), and tillage is necessary. Considering a potential tillage by planting date interaction and site-specific strip tillage opportunities, this thesis has the following objectives. The first objective is to test the performance of strip tillage, no tillage, and conventional tillage when each system is planted on the day that optimum soil temperature and water conditions for planting are reached for each system. The second objective is to conduct a soil temperature sensitivity analysis to residue-free band-width, and tillage depth with strip tillage using a model that couples water and heat transport in non-uniform soils. In a two-year study on a poorly drained soil tillage system, effects on corn yield were not detected when preestablished soil temperature and water content criteria were used to determine the day of planting each system. On the other hand, planting date has an effect on corn yield. A tillage system by planting date interaction was detected for soybean yield in one of two years, when drought conditions existed during the second half of July and August. Soil temperature, soil water content, and matric potential were most sensitive to changes in residue-free band-width at 0.05-m in both soils studied.
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Claims 4
Claim · model-written summary
In a two-year study on a poorly drained soil, tillage system did not detectably affect corn yield when planting day was set by preestablished soil temperature and water content criteria.
- Taxon
- corn
Zea mays subsp. mayse0 - Treatment
- tillage systeme0
- Outcome
- corn yielde0
- Direction
- no_changeinferrede0
- Qualifier
- when preestablished soil temperature and water content criteria were used to determine the day of planting each systeme0
- Setting
- poorly drained soile0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In a two-year study on a poorly drained soil tillage system, effects on corn yield were not detected when preestablished soil temperature and water content criteria were used to determine the day of planting each system”
Claim · model-written summary
Planting date had an effect on corn yield.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- planting datee0
- Outcome
- corn yielde0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“planting date has an effect on corn yield”
Claim · model-written summary
A tillage system by planting date interaction on soybean yield was detected in one of two years, when drought occurred in the second half of July and August.
- Taxon
- soybean
Glycine maxe0 - Treatment
- tillage system by planting date interactione0
- Outcome
- soybean yielde0
- Qualifier
- in one of two years, when drought conditions existed during the second half of July and Auguste0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A tillage system by planting date interaction was detected for soybean yield in one of two years, when drought conditions existed during the second half of July and August”
Claim · model-written summary
In a soil temperature sensitivity analysis with a coupled water and heat transport model, soil temperature, soil water content and matric potential were most sensitive to residue-free band-width at 0.05 m in both soils.
- Outcome
- Soil temperature, soil water content, and matric potentiale0
- Qualifier
- most sensitive to changes in residue-free band-width at 0.05-me0
Not reportedTaxonDirection
Verbatim
e0“Soil temperature, soil water content, and matric potential were most sensitive to changes in residue-free band-width at 0.05-m in both soils studied”
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tillage · yield · Zea mays (maize)Positive and negative results
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