Abstract
Abstract Experiments conducted at the University of Kentucky during 1969, 1970, and 1971 compared corn ( Zea mays L.) production under conventional and no‐tillage systems. The presence of a killed‐sod mulch in the no‐tillage plots almost eliminated the loss of moisture by direct evaporation from the soil surface during the early growing period, but after a full crop canopy had developed, losses from both production methods were about equal. Water loss from the soil during the full‐canopy period was compared with open pan evaporation to determine the rate of loss under varying levels of soil moisture deficiency. The average soil moisture deficiency during the period from about 3 weeks before to 6 weeks after silking was related to final grain yield, and a simple linear relationship indicated that each additional cm of water available to the plant increased yields by about 559 kg/ha. The relationship was tested on regional yield data for the years 1954 to 1968. Soil moisture status was simulated from precipitation and temperature data observed during the growing season by using the Palmer Crop Moisture Index method. The variation in predicted and observed yield follow each other very well, with a linear correlation coefficient of 0.81.
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Claims 4
Claim · model-written summary
In corn, the killed-sod mulch in no-tillage plots almost eliminated direct evaporation loss of moisture from the soil surface during the early growing period compared with conventional tillage.
- Taxon
- Corn
Zea mays subsp. mayst0 - Treatment
- killed‐sod mulch in the no‐tillage plotse0
- Outcome
- loss of moisture by direct evaporation from the soil surfacee0
- Direction
- almost eliminatede0
- Qualifier
- during the early growing periode0
- Comparator
- conventionale1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The presence of a killed‐sod mulch in the no‐tillage plots almost eliminated the loss of moisture by direct evaporation from the soil surface during the early growing period”
e1“conventional and no‐tillage systems”
t0“Corn”
Claim · model-written summary
After a full crop canopy had developed, soil moisture losses from the conventional and no-tillage production methods in corn were about equal.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- no‐tillagee1
- Outcome
- lossese0
- Direction
- about equale0
- Qualifier
- after a full crop canopy had developede0
- Comparator
- conventionale1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but after a full crop canopy had developed, losses from both production methods were about equal”
e1“conventional and no‐tillage systems”
t0“Corn”
Claim · model-written summary
In corn, each additional cm of water available to the plant (lower soil moisture deficiency from about 3 weeks before to 6 weeks after silking) increased grain yield by about 559 kg/ha in a simple linear relationship.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- additional cm of water available to the plante0
- Outcome
- yieldse0
- Direction
- increasede0
- Value
- 559 kg/hae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“each additional cm of water available to the plant increased yields by about 559 kg/ha”
t0“Corn”
Claim · model-written summary
Corn yield predicted from Palmer Crop Moisture Index simulated soil moisture and observed regional yield data (1954 to 1968) followed each other closely, with a linear correlation coefficient of 0.81.
Verbatim
e0“The variation in predicted and observed yield follow each other very well, with a linear correlation coefficient of 0.81”
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