Abstract
Abstract We conducted a field experiment to investigate the effects of white clover living mulch on potassium (K) nutrition and the yield of silage corn. We used a randomized block design with a 2 × 3 factorial arrangement of cropping system and K application treatments. The cropping system treatments were: (1) a white clover living mulch (LM) that had been established 10 months earlier, (2) conventional cultivation with no cover crop (CC). The K application treatments were: (1) no K application (K−), (2) K application at sowing of white clover (Kclover), (3) K application at sowing of corn (Kcorn). In the LM treatments, white clover was sown in August 2006. Corn was sown in June 2007. Before the corn was sown, the white clover shoots in the LM treatments were clipped. The three conventional cultivation treatments were then tilled and corn was sown in all treatments using a minimum tillage seeder. In the LM K) treatment, we observed symptoms of K deficiency in corn leaves on 23 July. At the silking stage of corn, the K and N contents of ear leaves in the LM treatments were significantly lower than those in the conventional cultivation treatments. In the LM K− treatment the K content of ear leaves was <1% and the yield of corn shoots was less than that recorded in the other treatments. Multiple regression analyses revealed that K was the nutrient most strongly related to corn yield. These results suggested that white clover LM declined the K nutrient status of corn and as a result decreased the yield of corn.
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Claims 7
Claim · model-written summary
Corn in the living mulch treatment without potassium showed leaf potassium deficiency symptoms.
- Taxon
- corn
Zea mays subsp. mayse0 - Organ / stage
- leavese0
- Outcome
- symptoms of K deficiencye0
- Qualifier
- on 23 Julye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the LM K) treatment, we observed symptoms of K deficiency in corn leaves on 23 July.”
Claim · model-written summary
Living mulch significantly lowered corn ear leaf potassium content relative to conventional cultivation at silking.
- Taxon
- cornZea mays subsp. mayse0
- Organ / stage
- ear leavese0
- Treatment
- LM treatmentse0
- Outcome
- K and N contents of ear leavese0
- Direction
- lowere0
- Qualifier
- silking stagee0
- Comparator
- conventional cultivation treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At the silking stage of corn, the K and N contents of ear leaves in the LM treatments were significantly lower than those in the conventional cultivation treatments.”
Claim · model-written summary
Living mulch significantly lowered corn ear leaf nitrogen content relative to conventional cultivation at silking.
- Taxon
- cornZea mays subsp. mayse0
- Organ / stage
- ear leavese0
- Treatment
- LM treatmentse0
- Outcome
- N contents of ear leavese0
- Direction
- lowere0
- Qualifier
- silking stagee0
- Comparator
- conventional cultivation treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At the silking stage of corn, the K and N contents of ear leaves in the LM treatments were significantly lower than those in the conventional cultivation treatments.”
Claim · model-written summary
Corn ear leaf potassium content in living mulch without potassium was below 1%.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- LM K− treatmente0
- Outcome
- K content of ear leavese0
- Value
- <1%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the LM K− treatment the K content of ear leaves was <1% and the yield of corn shoots was less than that recorded in the other treatments.”
Claim · model-written summary
Corn shoot yield in living mulch without potassium was lower than in other treatments.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- LM K− treatmente0
- Outcome
- yield of corn shootse0
- Direction
- less thane0
- Comparator
- other treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the LM K− treatment the K content of ear leaves was <1% and the yield of corn shoots was less than that recorded in the other treatments.”
Claim · model-written summary
Potassium was the nutrient most strongly related to corn yield in multiple regression.
- Taxon
- cornZea mays subsp. mayse0
- Compound
- Ke0
- Outcome
- corn yielde0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Multiple regression analyses revealed that K was the nutrient most strongly related to corn yield.”
Claim · model-written summary
The authors infer that white clover living mulch lowered corn potassium status and consequently yield.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- white clover LMe0
- Outcome
- yield of corne0
- Direction
- decreasede0
- Qualifier
- K nutrient statuse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These results suggested that white clover LM declined the K nutrient status of corn and as a result decreased the yield of corn.”
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See all 222 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.