Claim · model-written summary
Fertilizers (N, NP, and NPK) increased nitrate-N accumulation in most subsoil layers.
- Taxon
- wheat
Triticum aestivume0 - Treatment
- N, NP, and NPKe1
- Outcome
- NO 3 –N accumulatione1
- Direction
- increaseinferrede1
- Qualifier
- in most subsoil layerse1
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleComparatorSettingValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“under wheat ( Triticum aestivum L.)”
e1“Fertilizers (N, NP, and NPK) led to NO 3 –N accumulation in most subsoil layers”
Title
Shengmao Yang; Fengmin Li; Sukhdev S. Malhi; et al. Agronomy Journal 2004. doi:10.2134/agronj2004.1039
Other claims from this paper (12)
- Association Mean grain yield across fertilizer and manure treatments decreased from MNPK to the check.
- Intervention effect Yield response to applied N and P increased with time.
- Observation Yields in the check plots declined with time.
- Intervention effect Potassium fertilizer application gave no increase in grain yield during the initial 6 yr.
- Intervention effect Potassium fertilizer application gave a slight increase in grain yield during the next 5 yr.
- Intervention effect Potassium fertilizer application gave a dramatic increase in grain yield during the last 8 yr.
- Association Straw yield response to fertilizers and M was similar to the grain yield response.
- Intervention effect Fertilizers increased the mean harvest index (HI).
- Intervention effect Crude protein concentration and N uptake in grain and straw increased markedly with fertilizers.
- Intervention effect Manure (M) increased crude protein concentration and N uptake in grain and straw further than fertilizers alone.
- Intervention effect Combined fertilizers and M reduced soil nitrate-N accumulation compared with fertilizers alone.
- Recommendation Balanced application of chemical fertilizers and M at proper rates is important to protect soil and groundwater from nitrate-N pollution while sustaining crop production.