Abstract
【Objective】The aim of the experiment is to study the effects of different water and nitrogen treatments on root development and nitrogen metabolism of Vitis vinifera L.‘Cabernet Sauvignon'seedlings under mulched drip irrigation.【Method】Factorial experiment with two water-treatments(field capacity 60%to 90% and 50% to 90%)and three nitrogen-treatments on Cabernet Sauvignon seedlings was conducted under mulched drip irrigation. 【Result】Under mulched drip irrigation, the content of total nitrogen, ammonium nitrogen, nitrate nitrogen in leaf and root were increased after three-time topdressing of nitrogen(in May 20, June 30, July 30, NH4NO3was dissolved in water and applied to the seedlings with 1.5 g·plant-1, 1 g·plant-1, 1 g·plant-1respectively).There were significant differences in effects on total nitrogen content in grape leaves and roots between nitrogen treatments, but no significant differences between water treatments. Under the same water condition, nitrate reductase(NR) activity and ammonia assimilation rate in leaf and root of grape seedlings were better in two-time topdressing nitrogen application than one-time treatment 52d after treatment. At the late stage(83 d, 116 d), NR activity, ammonia assimilation rate were better in three-time topdressing nitrogen application than one-time and two-time treatments. It ws observed that suitable water treatment and three-time topdressing nitrogen application not only improved the effective root surface area and volume, but also increased the number of root tips. In addition, superoxide dismutase(SOD), peroxidase(POD) and catalase(CAT) protective enzyme activity and redox capacity kept at higher levels at late growth stage. 【Conclusion】Suitable water treatment(field capacity 60%-90%)and three-time topdressing nitrogen application increased the utilization efficiency of nitrogen, promoted the development of root system, and delayed root senescence at late growth stage.
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Claims 10
Claim · model-written summary
Three nitrogen topdressings increased total, ammonium and nitrate nitrogen content in leaves and roots.
- Taxon
- Vitis vinifera
Vitis viniferat0 - Organ / stage
- leaf and roote0
- Treatment
- three-time topdressing of nitrogene0
- Outcome
- content of total nitrogen, ammonium nitrogen, nitrate nitrogen in leaf and roote0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the content of total nitrogen, ammonium nitrogen, nitrate nitrogen in leaf and root were increased after three-time topdressing of nitrogen”
t0“Vitis vinifera”
Claim · model-written summary
Nitrogen treatments differed significantly in total nitrogen content in grape leaves and roots.
Not reportedComparatorDirection
Verbatim
e0“There were significant differences in effects on total nitrogen content in grape leaves and roots between nitrogen treatments”
Claim · model-written summary
Water treatments did not differ significantly in total nitrogen content in grape leaves and roots.
Not reportedComparatorDirection
Verbatim
e0“total nitrogen content in grape leaves and roots between nitrogen treatments, but no significant differences between water treatments”
Claim · model-written summary
At 52 days, two nitrogen topdressings gave better leaf and root nitrate reductase activity and ammonia assimilation than one topdressing under the same water condition.
Verbatim
e0“Under the same water condition, nitrate reductase(NR) activity and ammonia assimilation rate in leaf and root of grape seedlings were better in two-time topdressing nitrogen application than one-time treatment 52d after treatment”
Claim · model-written summary
At 83 and 116 days, three nitrogen topdressings gave better nitrate reductase activity and ammonia assimilation than one or two topdressings.
- Taxon
- Vitis viniferaVitis viniferat0
- Treatment
- three-time topdressing nitrogen applicatione0
- Outcome
- NR activity, ammonia assimilation ratee0
- Direction
- bettere0
- Qualifier
- 83 d, 116 de0
- Comparator
- one-time and two-time treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At the late stage(83 d, 116 d), NR activity, ammonia assimilation rate were better in three-time topdressing nitrogen application than one-time and two-time treatments”
t0“Vitis vinifera”
Claim · model-written summary
Suitable water treatment and three nitrogen topdressings improved effective root surface area and volume.
- Taxon
- Vitis viniferaVitis viniferat0
- Treatment
- suitable water treatment and three-time topdressing nitrogen applicatione0
- Outcome
- effective root surface area and volumee0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“suitable water treatment and three-time topdressing nitrogen application not only improved the effective root surface area and volume”
t0“Vitis vinifera”
Claim · model-written summary
Suitable water treatment and three nitrogen topdressings increased root-tip number.
- Taxon
- Vitis viniferaVitis viniferat0
- Treatment
- suitable water treatment and three-time topdressing nitrogen applicatione0
- Outcome
- number of root tipse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“suitable water treatment and three-time topdressing nitrogen application not only improved the effective root surface area and volume, but also increased the number of root tips”
t0“Vitis vinifera”
Claim · model-written summary
Protective enzyme activities and redox capacity remained higher at the late growth stage.
- Taxon
- Vitis viniferaVitis viniferat0
- Organ / stage
- late growth stagee0
- Outcome
- superoxide dismutase(SOD), peroxidase(POD) and catalase(CAT) protective enzyme activity and redox capacitye0
- Direction
- highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“superoxide dismutase(SOD), peroxidase(POD) and catalase(CAT) protective enzyme activity and redox capacity kept at higher levels at late growth stage”
t0“Vitis vinifera”
Claim · model-written summary
Field capacity of 60%-90% and three nitrogen topdressings increased nitrogen-use efficiency.
- Taxon
- Vitis viniferaVitis viniferat0
- Treatment
- Suitable water treatment(field capacity 60%-90%)and three-time topdressing nitrogen applicatione0
- Outcome
- utilization efficiency of nitrogene0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Suitable water treatment(field capacity 60%-90%)and three-time topdressing nitrogen application increased the utilization efficiency of nitrogen”
t0“Vitis vinifera”
Claim · model-written summary
Field capacity of 60%-90% and three nitrogen topdressings promoted root development and delayed late-stage root senescence.
- Taxon
- Vitis viniferaVitis viniferat0
- Treatment
- Suitable water treatment(field capacity 60%-90%)and three-time topdressing nitrogen applicatione0
- Outcome
- development of root system, and delayed root senescencee0
- Direction
- promotede0
- Qualifier
- late growth stagee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Suitable water treatment(field capacity 60%-90%)and three-time topdressing nitrogen application increased the utilization efficiency of nitrogen, promoted the development of root system, and delayed root senescence at late growth stage”
t0“Vitis vinifera”
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8 of 9 groups shown: named compounds and organisms first, then groups whose results differ (checked claim by claim), then those with positive and negative results, then the smaller groups.
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.