Claim · model-written summary
Soil supplied most crop nitrogen uptake despite urea application.
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleTreatmentComparatorSettingDirectionQualifier
Verbatim
e0“The majority (65‐83%) of the crop N uptake was derived from the soil in all treatments despite the application of urea at 120 kg N/ha”
e1“Rice‐wheat (RW)”
Title
E. Humphreys; Atul Nayyar; Jagadish Timsina 2008
Other claims from this paper (19)
- Intervention effect Rice yield rose significantly with nitrogen up to 160 kg N per hectare.
- Intervention effect Puddled transplanted rice exceeded other methods for biomass, yield and nitrogen use efficiency.
- Intervention effect Transplanted rice on permanent beds yielded 29% less than puddled transplanted rice at 120 kg N per hectare.
- Intervention effect Direct seeded rice on permanent beds yielded 44% less than transplanted rice on permanent beds.
- Intervention effect Wheat straw mulch lowered direct seeded rice bed yield by 26% on average.
- Intervention effect Mulching did not affect transplanted rice bed yield.
- Observation Dry seeded rice on flats and beds developed severe iron deficiency.
- Observation Dry seeded rice on flats and beds was prone to root nematode infestation.
- Association Direct seeded bed rice yield relative to puddled transplanted rice declined as beds aged.
- Association Transplanted bed rice relative yield showed no trend as beds aged.
- Observation Fertilizer nitrogen recovery was 30% in puddled transplanted rice.
- Observation Fertilizer nitrogen recovery was 14% in transplanted bed rice.
- Observation Fertilizer nitrogen recovery was 17% in direct seeded bed rice.
- Observation Total urea nitrogen losses were 52% to 60% in transplanted and direct seeded bed rice.
- Intervention effect Wheat yield rose with nitrogen through 120 kg per hectare and sometimes to 160.
- Intervention effect Permanent bed wheat yielded 75–96% of conventionally tilled wheat, without an age trend.
- Intervention effect Conventional and direct drilled wheat on flats had similar yield.
- Observation Wheat nitrogen recovery was similar among flat and bed treatments, and straw mulch did not affect yield or efficiency.
- Observation Applied nitrogen recovery in wheat was 27–38% in plants and 45–59% in soil.