Abstract
Pulse crop production is expanding in semiarid regions of the Northern Plains, and depends on successful biological N 2 -fixation. Inoculation failure, resulting in plant N deficiency and economic crop loss, might be alleviated by remedial N fertilizer application. The experiment was conducted using no-till management at two dryland sites in Montana in 1999 and 2000, where field pea and chickpea were grown in cereal stubble. Shoot biomass, shoot biomass N concentration, seed yield and seed N concentration were measured for uninoculated and inoculated controls and compared with remedial fertilizer N applied 0, 4, 6, and 8 wk after seeding. Spectral reflectance was compared for the inoculated and uninoculated controls. For field pea and chickpea, the critical period for fertilizer N application to prevent yield loss occurred within 6 wk of seeding (P ≤ 0.05). Logistic regression models derived from spectral reflectance had overall accuracies of 84 and 60% for detecting uninoculated control treatments in field pea and chickpea, respectively. The field pea model had a high degree of accuracy 6 wk after seeding, indicating it was capable of assisting a decision to apply remedial N fertilizer. Spectral reflectance provided a window of opportunity of 1 wk to apply remedial N fertilizer to attain full yield potential. Key words: Chickpea, field pea, inoculant failure, nitrogen, spectral reflectance
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Claims 6
Claim · model-written summary
Field pea required remedial fertilizer nitrogen within six weeks of seeding to prevent yield loss.
- Taxon
- field peae0
- Treatment
- fertilizer N applicatione0
- Outcome
- yield losse0
- Direction
- prevente0
- Qualifier
- within 6 wk of seedinge0
Not reportedComparator
Verbatim
e0“For field pea and chickpea, the critical period for fertilizer N application to prevent yield loss occurred within 6 wk of seeding (P ≤ 0.05).”
Claim · model-written summary
Chickpea required remedial fertilizer nitrogen within six weeks of seeding to prevent yield loss.
- Taxon
- chickpea
Cicer arietinume0 - Treatment
- fertilizer N applicatione0
- Outcome
- yield losse0
- Direction
- prevente0
- Qualifier
- within 6 wk of seedinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For field pea and chickpea, the critical period for fertilizer N application to prevent yield loss occurred within 6 wk of seeding (P ≤ 0.05).”
Claim · model-written summary
Spectral logistic regression detected uninoculated field pea controls with 84% overall accuracy.
- Taxon
- field peae0
- Outcome
- overall accuraciese0
- Value
- 84e0
- Qualifier
- detecting uninoculated control treatmentse0
Not reportedDirection
Verbatim
e0“Logistic regression models derived from spectral reflectance had overall accuracies of 84 and 60% for detecting uninoculated control treatments in field pea and chickpea, respectively.”
Claim · model-written summary
Spectral logistic regression detected uninoculated chickpea controls with 60% overall accuracy.
- Taxon
- chickpeaCicer arietinume0
- Outcome
- overall accuraciese0
- Value
- 60%e0
- Qualifier
- detecting uninoculated control treatmentse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Logistic regression models derived from spectral reflectance had overall accuracies of 84 and 60% for detecting uninoculated control treatments in field pea and chickpea, respectively.”
Claim · model-written summary
The field pea model had high accuracy six weeks after seeding and could assist remedial nitrogen decisions.
Verbatim
e0“The field pea model had a high degree of accuracy 6 wk after seeding, indicating it was capable of assisting a decision to apply remedial N fertilizer.”
Claim · model-written summary
Spectral reflectance provided a one-week window for remedial nitrogen to attain field pea full yield potential.
Verbatim
e0“Spectral reflectance provided a window of opportunity of 1 wk to apply remedial N fertilizer to attain full yield potential.”
e1“The field pea model had a high degree of accuracy 6 wk after seeding”
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