Abstract
A model of weed control, which took into account the stochastic nature of crop price, yield, and weed density, was developed to assist farmers in determining weed densities that justify herbicide application and the optimal rate of application. In an application of cocklebur control in soybeans, it was found that the value of following the "if-then-else" treatment strategy versus a fixed application rate regardless of weed density was approximately $25 per acre at low weed numbers. Profits of the marginal treatment strategy are higher than the "if-then-else" strategy, but may not be sufficient to cover the additional informational costs. Under both strategies, the total amount of herbicide applied decreases with increases in uncertainty under the assumption of risk neutrality. The result is due to the convex relationship between weed density and yield loss. Under the assumption of maximizing expected utility, there are instances in which herbicide use increases with risk aversion as per conventional wisdom.
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Claims 5
Claim · model-written summary
The value of following the if-then-else weed control strategy over a fixed herbicide rate was about $25 per acre at low weed numbers in soybeans.
- Taxon
- soybeans
Glycine maxe1 - Treatment
- if-then-elsee2
- Interactor
- cocklebur
Xanthium strumariume1weed - Outcome
- the value of followinge2
- Direction
- higherinferrede2
- Value
- approximately $25 per acree2
- Comparator
- a fixed application rate regardless of weed densitye2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“In an application of cocklebur control in soybeans”
e2“the value of following the "if-then-else" treatment strategy versus a fixed application rate regardless of weed density was approximately $25 per acre at low weed numbers”
Claim · model-written summary
The marginal treatment strategy gave higher profits than the if-then-else strategy in soybeans, but may not cover the additional informational costs.
- Taxon
- soybeansGlycine maxe1
- Treatment
- marginal treatment strategye3
- Interactor
- cockleburXanthium strumariume1weed
- Outcome
- Profitse3
- Direction
- highere3
- Qualifier
- may not be sufficient to cover the additional informational costse3
- Comparator
- if-then-elsee3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“In an application of cocklebur control in soybeans”
e3“Profits of the marginal treatment strategy are higher than the "if-then-else" strategy, but may not be sufficient to cover the additional informational costs”
Claim · model-written summary
Under both strategies, total herbicide applied decreased as uncertainty increased, under risk neutrality.
- Taxon
- soybeansGlycine maxe1
- Treatment
- increases in uncertaintye4
- Interactor
- cockleburXanthium strumariume1weed
- Outcome
- the total amount of herbicide appliede4
- Direction
- decreasese4
- Qualifier
- under the assumption of risk neutralitye4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“In an application of cocklebur control in soybeans”
e4“Under both strategies, the total amount of herbicide applied decreases with increases in uncertainty under the assumption of risk neutrality”
Claim · model-written summary
The decrease in herbicide use with uncertainty is attributed to the convex relationship between weed density and yield loss.
- Taxon
- soybeansGlycine maxe1
- Interactor
- cockleburXanthium strumariume1weed
- Outcome
- The total amount of herbicide appliede4
- Qualifier
- convex relationship between weed density and yield losse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“In an application of cocklebur control in soybeans”
e4“Under both strategies, the total amount of herbicide applied decreases with increases in uncertainty under the assumption of risk neutrality”
e5“The result is due to the convex relationship between weed density and yield loss”
Claim · model-written summary
Under expected utility maximisation, herbicide use increases with risk aversion in some instances.
- Taxon
- soybeansGlycine maxe1
- Treatment
- risk aversione6
- Interactor
- cockleburXanthium strumariume1weed
- Outcome
- herbicide usee6
- Direction
- increasese6
- Qualifier
- there are instances in whiche6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“In an application of cocklebur control in soybeans”
e6“Under the assumption of maximizing expected utility, there are instances in which herbicide use increases with risk aversion as per conventional wisdom”