Abstract
Plot trials were carried out to study effects of different patterns of long-term fertilization on composition of weed communities in maize field. The results show that no significant difference was observed in composition of weed communities between plots receiving balanced NPK fertilization of organic manure or chemical fertilizer. In plots without P application changes in composition of weed communities were obvious and so was the case in plots without N application, though not so obvious as it was with the former. In plots without K application, however, composition of the weed communities remained almost unchanged. PCA analysis indicated that soil available P was the most important factor affecting composition of weed communities, and followed by soil available N.
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Claims 6
Claim · model-written summary
Balanced organic and chemical NPK produced no significant weed-composition difference.
Zea maysNot reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no significant difference was observed in composition of weed communities between plots receiving balanced NPK fertilization of organic manure or chemical fertilizer”
t0“MAIZE FIELD”
Claim · model-written summary
Withholding P produced obvious weed-composition changes.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In plots without P application changes in composition of weed communities were obvious”
t0“MAIZE FIELD”
Claim · model-written summary
Withholding N changed weed composition, less obviously than withholding P.
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plots without N application, though not so obvious as it was with the former”
t0“MAIZE FIELD”
Claim · model-written summary
Withholding K left weed composition almost unchanged.
- Treatment
- without K applicatione0
- Outcome
- composition of the weed communitiese0
- Direction
- remained almost unchangede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In plots without K application, however, composition of the weed communities remained almost unchanged”
t0“MAIZE FIELD”
Claim · model-written summary
Available P was the strongest factor associated with weed composition.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soil available P was the most important factor affecting composition of weed communities”
t0“MAIZE FIELD”
Claim · model-written summary
Available N was the next most important factor associated with weed composition.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“followed by soil available N”
t0“MAIZE FIELD”
The same questions in other papers
potassium · weed · Zea mays (maize)Positive and negative results
1 in the opposite direction
This paper is about lacking the nutrient, so it counts the other way round here.
- positive
fertilization · weed · Zea mays (maize)Positive and negative results
27 papers in the same direction as this paper · 34 reporting no difference from an alternative
- positive
- positive
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58 papers more in this group
See all 62 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.