Abstract
Sulfur (S) deficiency of forage crops is being reported in southwestern and western Montana with increasing frequency.Several factors may contribute to this problem.The utilization of relatively high analysis fertilizer materials has reduced the by-product S application formerly derived from lower analysis fertilizers.Crop removal with high yields has also contributed to increased incidence of S deficiency on some soils.Nitrogen (N) fertilizer application to irrigated orchardgrass in 1978 inhibited growth and development while predisposing plants to secondary infection from disease organisms.This suggests other nutrition problems, including perhaps S. It was determined from a field plot experiment that S was deficient and warranted further investigation.Subsequent field experiments were undertaken in 1979 to determine optimal S level for initial and residual response and to compare soluble and insoluble S sources.Additional studies were conducted in 1980 to clarify the interaction of applied N and S fertilizers on forage yield and chemical composition.Significant forage yield response to S was found in 1978.Plant tissue levels of total nitrogen and total sulfur in ratio form (N/S)+ successfully predicted S deficiency in orchardgrass.Maximum yields were obtained with at least 34 kg S/ha (kilograms sulfur per hectare) as gypsum with residual S apparent at rates in excess of 67 kg S/ha.Sulfur source comparisons provided data on soluble and insoluble sources.Soil tests for S cannot predict deficient situations, however, the S soil test can identify incremental applications of spring applied S. Nitrogen-sulfur interaction was apparent in forage yield and chemical composition with maximum yield occurring only when both N and S were adequately supplied.Paul 0. Kresge for serving as major professor and provid
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Claims 12
Claim · model-written summary
Nitrogen fertilizer inhibited growth and development of irrigated orchardgrass in 1978.
- Taxon
- orchardgrass
.jpg?width=60)
Dactylis glomeratae0 - Treatment
- Nitrogen (N) fertilizer applicatione0
- Outcome
- growth and developmente0
- Direction
- inhibitede0
- Qualifier
- irrigated orchardgrass in 1978e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Nitrogen (N) fertilizer application to irrigated orchardgrass in 1978 inhibited growth and development”
t0“forages”
Claim · model-written summary
Nitrogen fertilizer predisposed irrigated orchardgrass to secondary disease infection in 1978.
- Taxon
- orchardgrassDactylis glomeratae0
- Treatment
- Nitrogen (N) fertilizer applicatione0
- Interactor
- disease organismse0pathogen
- Outcome
- secondary infection from disease organismse0
- Direction
- predisposinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen (N) fertilizer application to irrigated orchardgrass in 1978 inhibited growth and development while predisposing plants to secondary infection from disease organisms”
Claim · model-written summary
The 1978 field plot experiment identified sulfur deficiency.
- Taxon
- orchardgrassDactylis glomeratae1
- Outcome
- S was deficiente0
- Setting
- field plot experimente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It was determined from a field plot experiment that S was deficient”
e1“S deficiency in orchardgrass”
Claim · model-written summary
Sulfur produced a significant forage yield response in 1978.
- Taxon
- orchardgrassDactylis glomeratae1
- Treatment
- Se0
- Outcome
- forage yielde0
- Qualifier
- in 1978e0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Significant forage yield response to S was found in 1978”
e1“irrigated orchardgrass in 1978”
Claim · model-written summary
The plant tissue N/S ratio successfully predicted sulfur deficiency in orchardgrass.
- Taxon
- orchardgrassDactylis glomeratae0
- Outcome
- S deficiencye0
- Direction
- successfully predictede0
- Value
- N/Se0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plant tissue levels of total nitrogen and total sulfur in ratio form (N/S)+ successfully predicted S deficiency in orchardgrass”
Claim · model-written summary
At least 34 kg S/ha as gypsum produced maximum yields.
- Taxon
- orchardgrassDactylis glomeratae1
- Treatment
- at least 34 kg S/hae0
- Outcome
- Maximum yieldse0
- Direction
- Maximume0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maximum yields were obtained with at least 34 kg S/ha (kilograms sulfur per hectare) as gypsum”
e1“S deficiency in orchardgrass”
Claim · model-written summary
Residual sulfur was apparent at application rates above 67 kg S/ha.
- Taxon
- orchardgrassDactylis glomeratae1
- Outcome
- residual Se0
- Value
- 67 kg S/hae0
- Qualifier
- in excess ofe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“residual S apparent at rates in excess of 67 kg S/ha”
e1“S deficiency in orchardgrass”
Claim · model-written summary
The soil sulfur test could not predict deficient situations.
- Taxon
- orchardgrassDactylis glomeratae1
- Outcome
- predict deficient situationse0
- Direction
- cannote0
- Comparator
- deficient situationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soil tests for S cannot predict deficient situations”
e1“S deficiency in orchardgrass”
Claim · model-written summary
The soil sulfur test identified incremental spring sulfur applications.
- Taxon
- orchardgrassDactylis glomeratae1
- Outcome
- identify incremental applications of spring applied Se0
- Comparator
- spring applied Se0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the S soil test can identify incremental applications of spring applied S”
e1“S deficiency in orchardgrass”
Claim · model-written summary
Nitrogen and sulfur fertilization interacted in forage yield.
- Taxon
- orchardgrassDactylis glomeratae1
- Treatment
- Nitrogen-sulfure0
- Outcome
- forage yielde0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen-sulfur interaction was apparent in forage yield”
e1“S deficiency in orchardgrass”
Claim · model-written summary
Nitrogen and sulfur fertilization interacted in forage chemical composition.
- Taxon
- orchardgrassDactylis glomeratae1
- Treatment
- Nitrogen-sulfure0
- Outcome
- chemical compositione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen-sulfur interaction was apparent in forage yield and chemical composition”
e1“S deficiency in orchardgrass”
Claim · model-written summary
Maximum forage yield occurred only with adequate supplies of both nitrogen and sulfur.
- Taxon
- orchardgrassDactylis glomeratae1
- Treatment
- both N and S were adequately suppliede0
- Outcome
- maximum yielde0
- Direction
- maximume0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“maximum yield occurring only when both N and S were adequately supplied”
e1“S deficiency in orchardgrass”
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See all 15 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.