Claim · model-written summary
The optimal nitrogen rate increased urease and invertase activities compared with the conventional N rate.
Verbatim
e0“N3 (300 kg ha −1 for winter wheat and summer maize)”
e2“on the double cropping at Dawenkou research field (36°11’N, 117°06’E), Shandong Province, China”
e5“The optimal nitrogen rate effectively decreased soil bulk density and increased weight percentage of water-stable aggregate and activities of urease and invertase compared to conventional nitrogen rate”
Title
Zheng Liu; Ningning Yu; James J. Camberato; et al. Scientific Reports 2019. doi:10.1038/s41598-019-55913-1
Other claims from this paper (12)
- Intervention effect The optimal nitrogen rate gave the highest summer maize grain yield in 4 of 8 years.
- Intervention effect Grain yield under the optimal nitrogen rate was equivalent to the conventional N rate in the other years.
- Intervention effect The optimal nitrogen rate raised nitrogen partial factor productivity by 63% over the conventional N rate.
- Intervention effect The optimal nitrogen rate raised agronomic efficiency by 58% over the conventional N rate.
- Intervention effect The optimal nitrogen rate effectively decreased soil bulk density compared with the conventional N rate.
- Intervention effect The optimal nitrogen rate increased the weight percentage of water-stable aggregate compared with the conventional N rate.
- Intervention effect The optimal nitrogen rate reduced fertilizer nitrogen loss by 76% compared with the conventional N rate.
- Intervention effect The optimal nitrogen rate reduced global warming potential by 35% compared with the conventional N rate.
- Intervention effect The optimal nitrogen rate decreased annual greenhouse gas intensity by 14–35% compared with the other N rates.
- Intervention effect The net ecosystem economic budget under the optimal nitrogen rate was 252–604 $ ha −1 yr. −1 higher than under other addition levels.
- Intervention effect The optimal nitrogen rate produced more grains.
- Intervention effect The optimal nitrogen rate obtained higher economic and environmental benefits.