Abstract
The study was aimed to determine the effect of wheat straw incorporation and nitrogen (N) fertilization on soil fertility and enzyme activity, as well as sweetpoato yield and quality. Field experiment was conducted in the summer seasons of 2017 and 2018, and four treatments were set: zero straw +50 kg·ha−1N (S0N50), 50% straw return +50 kg ha−1N (S1N50), 100% straw return +50 kg·ha−1N (S2N50), 100% straw return+150 kg ha−1N (S2N150). The aboveground yield, storage roots yield and single root fresh weight increased with the increase of straw returning quantity(S2N50> S1N50> S0N50). The storage root yield ofS2N150in 2017 was higher than that ofS2N50,but lower than that ofS2N50in 2018. Two years of nitrogen/straw incorporation also increased the starch content of sweetpotato, but decreased the reducing sugar, soluble sugar and protein content. The available N, total N, available P, available K and organic matter content, as well as catalase, alkaline phosphorylase, urease and invertase activity in soil were enhanced by nitrogen/straw incorporation. The results indicated that the conjoint application of full amount of straw and appropriate amount of N had the best effect on increasing the yield and starch content of sweetpotato.
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Claims 8
Claim · model-written summary
Increasing straw return increased sweetpotato aboveground yield, storage root yield, and single root fresh weight.
- Taxon
- sweetpotato
_Flower.jpg?width=60)
Ipomoea batatast0 - Treatment
- straw returning quantitye0
- Outcome
- aboveground yield, storage roots yield and single root fresh weighte0
- Direction
- increasede0
- Comparator
- S0N50e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Flower.jpg?width=500)
Verbatim
e0“The aboveground yield, storage roots yield and single root fresh weight increased with the increase of straw returning quantity(S2N50> S1N50> S0N50)”
t0“sweetpotato”
Claim · model-written summary
S2N150 gave higher storage root yield than S2N50 in 2017.
- Taxon
- sweetpotatoIpomoea batatast0
- Treatment
- S2N150e0
- Outcome
- storage root yielde0
- Direction
- highere0
- Comparator
- S2N50e0
- Setting
- 2017e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The storage root yield ofS2N150in 2017 was higher than that ofS2N50”
t0“sweetpotato”
Claim · model-written summary
S2N150 gave lower storage root yield than S2N50 in 2018.
- Taxon
- sweetpotatoIpomoea batatast0
- Treatment
- S2N150e0
- Outcome
- storage root yielde0
- Direction
- lowere0
- Comparator
- S2N50e0
- Setting
- 2018e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The storage root yield ofS2N150in 2017 was higher than that ofS2N50,but lower than that ofS2N50in 2018”
t0“sweetpotato”
Claim · model-written summary
Nitrogen and straw incorporation increased sweetpotato starch content.
- Taxon
- sweetpotatoIpomoea batatase0
- Treatment
- nitrogen/straw incorporatione0
- Outcome
- starch contente0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two years of nitrogen/straw incorporation also increased the starch content of sweetpotato”
Claim · model-written summary
Nitrogen and straw incorporation decreased sweetpotato reducing sugar, soluble sugar, and protein content.
- Taxon
- sweetpotatoIpomoea batatase0
- Treatment
- nitrogen/straw incorporatione0
- Outcome
- reducing sugar, soluble sugar and protein contente0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two years of nitrogen/straw incorporation also increased the starch content of sweetpotato, but decreased the reducing sugar, soluble sugar and protein content”
Claim · model-written summary
Nitrogen and straw incorporation enhanced soil available and total nitrogen, available phosphorus and potassium, and organic matter.
- Taxon
- sweetpotatoIpomoea batatast0
- Treatment
- nitrogen/straw incorporatione0
- Outcome
- available N, total N, available P, available K and organic matter contente0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The available N, total N, available P, available K and organic matter content, as well as catalase, alkaline phosphorylase, urease and invertase activity in soil were enhanced by nitrogen/straw incorporation”
t0“sweetpotato”
Claim · model-written summary
Nitrogen and straw incorporation enhanced soil catalase, alkaline phosphorylase, urease, and invertase activity.
- Taxon
- sweetpotatoIpomoea batatast0
- Treatment
- nitrogen/straw incorporatione0
- Outcome
- catalase, alkaline phosphorylase, urease and invertase activity in soile0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The available N, total N, available P, available K and organic matter content, as well as catalase, alkaline phosphorylase, urease and invertase activity in soil were enhanced by nitrogen/straw incorporation”
t0“sweetpotato”
Claim · model-written summary
The authors conclude full straw return with appropriate nitrogen best improves sweetpotato yield and starch content.
- Taxon
- sweetpotatoIpomoea batatase0
- Treatment
- full amount of straw and appropriate amount of Ne0
- Outcome
- yield and starch contente0
- Direction
- increasinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the conjoint application of full amount of straw and appropriate amount of N had the best effect on increasing the yield and starch content of sweetpotato”
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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.