Claim · model-written summary
Fertilizer N added for soybean as plow-down, disked-in, and side-dressed at early flowering and at pod filling did not increase yields.
- Taxon
- soybean
Glycine maxe1 - Treatment
- Fertilizer N added for soybean as plow‐down, disked‐in, and side‐dressed at early flowering and at pod fillinge1
- Outcome
- yieldse1
- Direction
- did not increasee1
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleComparatorSettingValueQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Fertilizer N added for soybean as plow‐down, disked‐in, and side‐dressed at early flowering and at pod filling did not increase yields”
Title
Soybean Yields with Direct and Residual Nitrogen Fertilization1
L. F. Welch; L. V. Boone; C. G. Chambliss; et al. Agronomy Journal 1973. doi:10.2134/agronj1973.00021962006500040007x
Other claims from this paper (7)
- Intervention effect Nitrogen at rates up to 360 kg/ha added for the preceding year's corn had no effect on soybean yields.
- Intervention effect Organic N sources such as manure or alfalfa did not increase soybean yields.
- Intervention effect Combinations of organic and inorganic N sources did not increase soybean yields.
- Intervention effect Nitrogen added for soybeans planted on four dates did not increase yields.
- Intervention effect High N rates (1800 and 1440 kg/ha) broadcast and disked in during spring decreased soybean yield, attributed to germination and seedling injury.
- Intervention effect Across all studies, yields were significantly increased by N fertilizer in only 3 of 133 instances, at high, uneconomical N rates.
- Mechanism The authors conclude that N available to the plant is not the factor that presently limits soybean yields in Illinois.