Claim · model-written summary
No-till lowered reproductive leaf SPAD and mature whole-plant N after diagonal ammonia application, while parallel application showed no tillage effect.
- Treatment
- no-tille0
- Outcome
- reproductive-stage leaf chlorophyll content (SPAD), or whole-plant N content at maturitye0
- Direction
- lowere0
- Qualifier
- after diagonal applicatione0
Zea maysNot reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleComparatorSettingValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The tillage system did not impact reproductive-stage leaf chlorophyll content (SPAD), or whole-plant N content at maturity when NH3 was parallel-applied, but these plant responses were significantly lower in no-till after diagonal application”
t0“Maize”
Title
Péter Kovács Purdue e-Pubs (Purdue University System) 2013
Other claims from this paper (19)
- Intervention effect Parallel ammonia placement did not generally improve plant growth uniformity relative to diagonal placement.
- Intervention effect Parallel ammonia placement did not generally improve leaf SPAD uniformity relative to diagonal placement.
- Intervention effect Parallel ammonia placement did not generally improve final grain-weight uniformity relative to diagonal placement.
- Observation In 2011, plant-to-plant variability was present at emergence and persisted through growth.
- Observation In 2011, more barren plants occurred than in 2010 and 2012.
- Observation In 2011, variation in kernel number and per-plant grain weight exceeded 2010 and 2012.
- Intervention effect Conventional tillage generally lowered plant-to-plant variation.
- Intervention effect Conventional tillage produced consistently higher yields than no-till.
- Association Within-row distance from a diagonal ammonia band explained up to 5% of plant-to-plant morphophysiological variation.
- Association In 2011, grain weight per plant was lower near the diagonal ammonia band.
- Association At high nitrogen rate in no-till, plants near the diagonal band tended to be smaller and lower yielding.
- Association Silk emergence timing, stem volume at V15 or R1, and stalk diameter at R3 were the most influential predictors of per-plant grain weight.
- Association Variation in emergence thermal units and plant spacing had almost zero impact on final yields.
- Intervention effect Parallel placement improved whole-season nitrogen uptake at 145 kg N ha-1 in no-till relative to diagonal placement.
- Intervention effect Lowering pre-plant N rate from 202 to 145 kg N ha-1 lowered mature maize biomass and N accumulation under diagonal placement but not parallel placement.
- Intervention effect Maize grain yield and mature whole-plant N accumulation almost doubled with increasing N rates in 2010-2011.
- Observation Drought limited maize response to ammonia in 2012.
- Observation The highest grain yield occurred with side-dress 202 kg N ha-1 in 2010-2011 and pre-plant 202 kg N ha-1 in 2012.
- Observation Pre-plant 202 kg N ha-1 consistently gave the highest whole-plant N uptake.