Abstract
Incorporating green manure crops into soil may increase P bioavailability for succeeding crops. We conducted a greenhouse study to evaluate the effects of green manures on biomass and P utilization of a succeeding grain sorghum [ Sorghum bicolor (L.) Moench] crop. Four perennial forages and four winter annual cover crops were grown in pots, killed, and incorporated into the soil before planting sorghum in the same pots. Sorghum P uptake was positively correlated with perennial forage P uptake. Among winter cover crops, sorghum P uptake following white lupine ( Lupinus albus L.) was lower than in all other treatments, including the control (no previous cover crop), even though lupine biomass, N content, and P uptake were two to three times greater than those of the other winter cover crops. Phosphorus uptake differed slightly among the other three winter cover crops but sorghum P uptake was not correlated to winter cover crop P uptake. Thus, among winter cover crops, plant type rather than P uptake seemed to influence the subsequent sorghum crop's P uptake. However, sorghum biomass following the three winter cover crops other than lupine was greater than sorghum biomass in the control treatment, indicating that there was a beneficial cover crop rotation effect among these three winter cover crops. Soil samples were collected and analyzed for Bray‐1 P when green manure crops were planted, when they were incorporated into the soil, when sorghum was planted and when sorghum was harvested. These data showed that the Bray‐1 soil P test has little potential to predict differences in P uptake and release among different types of green manures and it has limited potential to predict P uptake by sorghum following incorporation of green manures.
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Claims 8
Claim · model-written summary
Sorghum P uptake was positively associated with perennial forage P uptake.
SorghumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sorghum P uptake was positively correlated with perennial forage P uptake.”
Claim · model-written summary
White lupine as the preceding cover crop gave lower sorghum P uptake than all other treatments, including the no-cover control.
- Treatment
- white lupinee0
- Outcome
- sorghum P uptakee0
- Direction
- lowere0
- Comparator
- all other treatments, including the control (no previous cover crop)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sorghum P uptake following white lupine ( Lupinus albus L.) was lower than in all other treatments, including the control (no previous cover crop)”
Claim · model-written summary
White lupine had two to three times greater biomass, nitrogen content and phosphorus uptake than other winter cover crops.
Verbatim
e0“lupine biomass, N content, and P uptake were two to three times greater than those of the other winter cover crops”
Claim · model-written summary
Sorghum P uptake differed slightly among the other three winter cover crops.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phosphorus uptake differed slightly among the other three winter cover crops”
e1“succeeding grain sorghum”
Claim · model-written summary
Sorghum P uptake was not correlated with winter cover crop P uptake.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sorghum P uptake was not correlated to winter cover crop P uptake”
Claim · model-written summary
Sorghum biomass after the three winter cover crops other than lupine exceeded the control.
- Treatment
- three winter cover crops other than lupinee0
- Outcome
- sorghum biomasse0
- Direction
- greatere0
- Comparator
- control treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sorghum biomass following the three winter cover crops other than lupine was greater than sorghum biomass in the control treatment”
Claim · model-written summary
Bray-1 soil P had little potential to predict differences in P uptake and release among green manures.
Verbatim
e0“the Bray‐1 soil P test has little potential to predict differences in P uptake and release among different types of green manures”
Claim · model-written summary
Bray-1 soil P had limited potential to predict sorghum P uptake after green manure incorporation.
- Treatment
- incorporation of green manurese0
- Outcome
- predict P uptake by sorghume0
- Value
- limited potentiale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“it has limited potential to predict P uptake by sorghum following incorporation of green manures”
The same questions in other papers
cover crop · growth · SorghumPositive and negative results
2 in the opposite direction · 1 reporting no difference from an alternative
- negative
- negative
- no effect
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.