Claim · model-written summary
Limited nitrogen availability lowered grain protein more than grain yield.
Verbatim
e0“Limited N availability causes a decrease in grain protein content rather than in grain yield.”
t0“Wintergetreide”
Title
K.‐W. Becker; A. Bruss Journal of Agronomy and Crop Science 1996. doi:10.1111/j.1439-037x.1996.tb00254.x
Other claims from this paper (13)
- Intervention effect Crop yield and quality after 6–8 years of reduced nitrogen were similar to those after one year.
- Intervention effect Without nitrogen, winter wheat grain yield fell to about 60% of the locally recommended dressing yield.
- Intervention effect Without nitrogen, winter barley grain yield fell to about 60% of the locally recommended dressing yield.
- Intervention effect Without nitrogen, white sugar yield remained at 90% of the local normal yield.
- Association Yields declined slightly as the trials continued.
- Observation Cereal and beet yields remained stable within each nitrogen level after six years.
- Observation Unfertilized winter wheat grain contained 1.5–1.7% nitrogen.
- Observation Unfertilized winter barley grain contained 1.0–1.6% nitrogen.
- Observation Grain nitrogen content stayed constant during six years.
- Observation Annual nitrogen export remained at 55–91 kg N/ha.
- Observation Sugar beet had the highest annual nitrogen export, at 74–117 kg N/ha in the beet body.
- Association Location differences in nitrogen export were not explained by soil quality.
- Mechanism Sustained high yield without fertilizer may reflect nitrogen fixation, atmospheric deposition and soil nitrogen depletion.