Abstract
Agronomic traits such as yield,quality and nitrate content of gramineous forages are closely related to nitrogen level.Field experiments were conducted to study the effects of six urea application levels and four application methods on the agronomic traits,yield,quality,and nitrogen producing efficiency of ryegrass.Correlations among yield,crude protein content,amino acid content,N application amount and many agronomic traits were also investigated.Tiller number,plant height,yield,crude protein content,amino acid content and nitrate content significantly increased with increasing N application.However,effects of N application on ryegrass became less and nitrogen production efficiency became low with further increasing N application amounts.When N application was over 100 kg/hm2 after each cutting,N fertilizer increased crude protein content but had little influence on amino acid content.When N application reached 250 kg/hm2 after each cutting,plant height and yield showed decreasing trends.When N application was over 150 kg/hm2,nitrate N content increased significantly,and even exceeded the 25% poisoning criterion.There were positive correlations among yield,plant height,tiller number,crude protein content,and nitrate N content of ryegrass.The yield was significantly correlated with the N application amount of broadcast applications.Crude protein and amino acid content were significantly or extremely significantly correlated with N application amount.Moreover,there was an extremely significant correlation between nitrate content and N application amount.Deep application influenced tiller number and plant height,and increase yield,crude protein and amino acid content.
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Claims 13
Claim · model-written summary
Increasing N increased tiller number, plant height and yield significantly.
LoliumNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“ryegrass”
e0“Tiller number,plant height,yield,crude protein content,amino acid content and nitrate content significantly increased with increasing N application”
Claim · model-written summary
Increasing N increased crude protein, amino acid and nitrate contents significantly.
- Treatment
- increasing N applicatione0
- Outcome
- crude protein content,amino acid content and nitrate contente0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“ryegrass”
e0“Tiller number,plant height,yield,crude protein content,amino acid content and nitrate content significantly increased with increasing N application”
Claim · model-written summary
At higher N amounts, nitrogen production efficiency became low.
- Treatment
- further increasing N application amountse0
- Outcome
- nitrogen production efficiencye0
- Direction
- lowe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“ryegrass”
e0“nitrogen production efficiency became low with further increasing N application amounts”
Claim · model-written summary
Above 100 kg/hm2 after cutting, N raised crude protein content.
- Treatment
- N application was over 100 kg/hm2 after each cuttinge0
- Outcome
- crude protein contente0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“ryegrass”
e0“When N application was over 100 kg/hm2 after each cutting,N fertilizer increased crude protein content but had little influence on amino acid content”
Claim · model-written summary
Above 100 kg/hm2 after cutting, N had little influence on amino acid content.
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“ryegrass”
e0“When N application was over 100 kg/hm2 after each cutting,N fertilizer increased crude protein content but had little influence on amino acid content”
Claim · model-written summary
At 250 kg/hm2 after cutting, plant height and yield trended downward.
- Treatment
- N application reached 250 kg/hm2 after each cuttinge0
- Outcome
- plant height and yielde0
- Direction
- decreasinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“ryegrass”
e0“When N application reached 250 kg/hm2 after each cutting,plant height and yield showed decreasing trends”
Claim · model-written summary
Above 150 kg/hm2, nitrate N content increased significantly and exceeded the poisoning criterion.
- Treatment
- N application was over 150 kg/hm2e0
- Outcome
- nitrate N contente0
- Direction
- increasede0
- Qualifier
- 25% poisoning criterione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“ryegrass”
e0“When N application was over 150 kg/hm2,nitrate N content increased significantly,and even exceeded the 25% poisoning criterion”
Claim · model-written summary
Yield, plant height, tiller number, protein and nitrate content were positively correlated.
- Outcome
- yield,plant height,tiller number,crude protein content,and nitrate N contente0
- Direction
- positivee0
- Qualifier
- correlationse0
Not reportedOrgan / stageTreatment
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“ryegrass”
e0“There were positive correlations among yield,plant height,tiller number,crude protein content,and nitrate N content of ryegrass”
Claim · model-written summary
Yield correlated significantly with broadcast N amount.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“ryegrass”
e0“The yield was significantly correlated with the N application amount of broadcast applications”
Claim · model-written summary
Crude protein and amino acids correlated significantly with N amount.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“ryegrass”
e0“Crude protein and amino acid content were significantly or extremely significantly correlated with N application amount”
Claim · model-written summary
Nitrate content correlated extremely significantly with N amount.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“ryegrass”
e0“there was an extremely significant correlation between nitrate content and N application amount”
Claim · model-written summary
Deep N application influenced tiller number and height.
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“ryegrass”
e0“Deep application influenced tiller number and plant height,and increase yield,crude protein and amino acid content”
Claim · model-written summary
Deep N application increased yield, crude protein and amino acid content.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“ryegrass”
e0“Deep application influenced tiller number and plant height,and increase yield,crude protein and amino acid content”
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