Abstract
To evaluate the effects of nitrogen (N) and irrigation coupling on the soil N distribution, plant N utilization, and fruit yield of rabbiteye blueberries (Vaccinium virgatum), a field experiment was designed using two factors (water and fertilizer application) with four levels of irrigation and three levels of fertilization, and a control. Under the different water and fertilizer combinations, N primarily accumulated in the leaves. Irrigation and N application within appropriate ranges (pure N ≤ 29 g/plant and irrigation volume ≤ 2.5 L/plant) significantly improved the blueberry fruit yield. Increases in water and N within these ranges promoted the effective accumulation of N in various organs and the absorption and utilization of N in the plants, which ultimately promoted blueberry yield. With increased N application rate, the nitrate N content of the 0–20 cm and 20–50 cm soil layers increased. With increased irrigation volume, the nitrate N content of the 0–20 cm soil layer decreased, while the nitrate content in the 20–50 cm soil layer increased. Low N and moderate water treatments resulted in high fruit yields and reduced nitrate N retention in the soil. Under these conditions, the economic input-output ratio was high and the soil N accumulation was low, and thus the economic and ecological benefits were maximized.
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Claims 12
Claim · model-written summary
Across water and fertilizer combinations, nitrogen accumulated primarily in blueberry leaves.
Verbatim
e0“Under the different water and fertilizer combinations, N primarily accumulated in the leaves”
t0“Rabbiteye Blueberry Plants”
Claim · model-written summary
Irrigation and nitrogen within the stated ranges significantly improved blueberry fruit yield.
- Taxon
- blueberrye0
- Treatment
- Irrigation and N application within appropriate ranges (pure N ≤ 29 g/plant and irrigation volume ≤ 2.5 L/plant)e0
- Outcome
- blueberry fruit yielde0
- Direction
- improvede0
Not reportedComparator
Verbatim
e0“Irrigation and N application within appropriate ranges (pure N ≤ 29 g/plant and irrigation volume ≤ 2.5 L/plant) significantly improved the blueberry fruit yield”
Claim · model-written summary
Increasing water and nitrogen within the stated ranges promoted nitrogen accumulation in blueberry organs.
- Taxon
- blueberryt0
- Treatment
- Increases in water and N within these rangese0
- Outcome
- effective accumulation of N in various organse0
- Direction
- promotede0
Not reportedComparator
Verbatim
e0“Increases in water and N within these ranges promoted the effective accumulation of N in various organs”
t0“blueberry”
Claim · model-written summary
Increasing water and nitrogen within the stated ranges promoted blueberry nitrogen absorption and utilization.
- Taxon
- blueberryt0
- Treatment
- Increases in water and N within these rangese0
- Outcome
- absorption and utilization of N in the plantse0
- Direction
- promotede0
Not reportedComparator
Verbatim
e0“Increases in water and N within these ranges promoted the effective accumulation of N in various organs and the absorption and utilization of N in the plants”
t0“blueberry”
Claim · model-written summary
Increasing water and nitrogen within the stated ranges promoted blueberry yield.
Not reportedComparator
Verbatim
e0“Increases in water and N within these ranges promoted the effective accumulation of N in various organs and the absorption and utilization of N in the plants, which ultimately promoted blueberry yield”
Claim · model-written summary
Higher nitrogen application increased nitrate nitrogen in the 0–20 cm and 20–50 cm soil layers.
- Taxon
- blueberryt0
- Treatment
- increased N application ratee0
- Outcome
- nitrate N content of the 0–20 cm and 20–50 cm soil layerse0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“With increased N application rate, the nitrate N content of the 0–20 cm and 20–50 cm soil layers increased”
t0“blueberry”
Claim · model-written summary
Higher irrigation decreased nitrate nitrogen in the 0–20 cm soil layer.
- Taxon
- blueberryt0
- Treatment
- increased irrigation volumee0
- Outcome
- nitrate N content of the 0–20 cm soil layere0
- Direction
- decreasede0
Not reportedComparator
Verbatim
e0“With increased irrigation volume, the nitrate N content of the 0–20 cm soil layer decreased”
t0“blueberry”
Claim · model-written summary
Low nitrogen and moderate water treatments produced high blueberry fruit yields.
Verbatim
e0“Low N and moderate water treatments resulted in high fruit yields”
t0“blueberry”
Claim · model-written summary
Low nitrogen and moderate water treatments reduced nitrate nitrogen retention in soil.
- Taxon
- blueberryt0
- Treatment
- Low N and moderate water treatmentse0
- Outcome
- nitrate N retention in the soile0
- Direction
- reducede0
Not reportedComparator
Verbatim
e0“Low N and moderate water treatments resulted in high fruit yields and reduced nitrate N retention in the soil”
t0“blueberry”
Claim · model-written summary
Under low nitrogen and moderate water, the economic input-output ratio was high.
Verbatim
e0“Under these conditions, the economic input-output ratio was high”
t0“blueberry”
Claim · model-written summary
Under low nitrogen and moderate water, soil nitrogen accumulation was low.
Verbatim
e0“the soil N accumulation was low”
t0“blueberry”
Claim · model-written summary
The authors concluded that low nitrogen and moderate water maximize economic and ecological benefits.
Verbatim
e0“the economic and ecological benefits were maximized”
e1“Low N and moderate water treatments resulted in high fruit yields and reduced nitrate N retention in the soil”
t0“Rabbiteye Blueberry Plants”
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See all 7 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.