Abstract
A trial was conducted to study the long-term effects of alley cropping on maize under continuous cropping with and without fertilizer. Maize was planted twice a year for four years. Maize yields were higher with alley cropping than without alley cropping from the fourth crop onward. Fertilizer application increased yield for each crop. Average yields over the eight crops were highest for the combination of alley cropping and fertilizer application. The long-term effects of the treatments on maize yield were estimated by regression of grain yield on time expressed as consecutive maize crops. A dummy variable was included in the multiple regression equations to account for cropping seasons in which drought or other factors severely reduced yields. Without alley cropping, maize yields declined, while with alley cropping, maize yields increased over time. Alley cropping with moderate fertilizer use may be the best means to stabilize yield and to increase productivity where long fallow periods are no longer possible.
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Claims 6
Claim · model-written summary
Alley cropping increased maize yields from the fourth crop onward.
- Treatment
- alley croppinge0
- Outcome
- Maize yieldse0
- Direction
- highere0
- Qualifier
- from the fourth crop onwarde0
- Comparator
- without alley croppinge0
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maize yields were higher with alley cropping than without alley cropping from the fourth crop onward.”
Claim · model-written summary
Fertilizer application increased yield for every crop.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fertilizer application increased yield for each crop.”
t0“maize”
Claim · model-written summary
The combination of alley cropping and fertilizer produced the highest average yield over eight crops.
- Treatment
- combination of alley cropping and fertilizer applicatione0
- Outcome
- Average yields over the eight cropse0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Average yields over the eight crops were highest for the combination of alley cropping and fertilizer application.”
t0“maize”
Claim · model-written summary
Without alley cropping, maize yield declined over time.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Without alley cropping, maize yields declined, while with alley cropping, maize yields increased over time.”
Claim · model-written summary
With alley cropping, maize yield increased over time.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Without alley cropping, maize yields declined, while with alley cropping, maize yields increased over time.”
Claim · model-written summary
The authors suggest alley cropping with moderate fertilizer to stabilize and increase yield where long fallows are impractical.
- Outcome
- Alley cropping with moderate fertilizer use may be the best means to stabilize yield and to increase productivitye0
- Qualifier
- where long fallow periods are no longer possiblee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Alley cropping with moderate fertilizer use may be the best means to stabilize yield and to increase productivity where long fallow periods are no longer possible.”
t0“maize”
The same questions in other papers
fertilization · yield · Zea mays (maize)Positive and negative results
3,484 papers in the same direction as this paper · 338 in the opposite direction · 85 reporting no difference from an alternative
- positive
- negative
- no effect
3,904 papers more in this group
See all 3,908 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.