Abstract
The effect of N fertilizer rates on N use efficiency at different growth stages of rice and its eco-economic suitable N application amount in high-yielding paddy field in Fuyang, northern Zhejiang Province were studied from 2004 to 2005. The nitrogen content of rice leaf, stem, spike, root and in soil was determined at different growth stage of rice under N treatments. The results show that rice yield under different N supply levels increased firstly and dropped as the N rates increase. Compared with the low N applied rate, the higher rate of N input produced no significant effect on rice yield and N use efficiency. However, more N was discharged into environment with higher N application. According to the results of N use efficiency at different growth stages of rice in two years, the proportion of nitrogenous fertilizer input should be adjusted at regreening, tillering and booting stage. According to the rice production and eco-economy benefit analysis, the application amount of N between 195-232 kg·hm-2 could be better for maintaining high rice yield and minimizing N loss in paddy field.
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Claims 6
Claim · model-written summary
Rice yield first rose then fell as nitrogen rates increased.
- Taxon
- rice
Oryza sativae0 - Treatment
- different N supply levelse0
- Outcome
- rice yielde0
- Direction
- increased firstly and droppede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rice yield under different N supply levels increased firstly and dropped as the N rates increase”
Claim · model-written summary
Higher nitrogen input had no significant yield difference from a low rate.
- Taxon
- riceOryza sativae0
- Treatment
- higher rate of N inpute0
- Outcome
- rice yielde0
- Direction
- no significant effecte0
- Comparator
- low N applied ratee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with the low N applied rate, the higher rate of N input produced no significant effect on rice yield and N use efficiency”
Claim · model-written summary
Higher nitrogen input had no significant difference in nitrogen use efficiency.
- Taxon
- riceOryza sativae0
- Treatment
- higher rate of N inpute0
- Outcome
- N use efficiencye0
- Direction
- no significant effecte0
- Comparator
- low N applied ratee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with the low N applied rate, the higher rate of N input produced no significant effect on rice yield and N use efficiency”
Claim · model-written summary
Higher nitrogen application discharged more nitrogen to the environment.
- Taxon
- riceOryza sativat0
- Treatment
- higher N applicatione0
- Outcome
- N was discharged into environmente0
- Direction
- moree0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“more N was discharged into environment with higher N application”
t0“rice”
Claim · model-written summary
Authors recommend adjusting nitrogen input proportions at regreening, tillering and booting.
- Taxon
- riceOryza sativat0
- Outcome
- proportion of nitrogenous fertilizer input should be adjusted at regreening, tillering and booting stagee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the proportion of nitrogenous fertilizer input should be adjusted at regreening, tillering and booting stage”
t0“rice”
Claim · model-written summary
Authors recommend 195-232 kg·hm-2 nitrogen for high yield and low loss.
- Taxon
- riceOryza sativae0
- Outcome
- application amount of N between 195-232 kg·hm-2e0
- Value
- 195-232 kg·hm-2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the application amount of N between 195-232 kg·hm-2 could be better for maintaining high rice yield and minimizing N loss in paddy field”
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