The Impact of Access to Soil and Water Conservation Information on Migration Intentions: Evidence from Malawi.

Last registered on September 12, 2025

Pre-Trial

Trial Information

General Information

Title
The Impact of Access to Soil and Water Conservation Information on Migration Intentions: Evidence from Malawi.
RCT ID
AEARCTR-0016580
Initial registration date
September 12, 2025

Initial registration date is when the trial was registered.

It corresponds to when the registration was submitted to the Registry to be reviewed for publication.

First published
September 12, 2025, 10:48 AM EDT

First published corresponds to when the trial was first made public on the Registry after being reviewed.

Locations

Primary Investigator

Affiliation
Hiroshima University

Other Primary Investigator(s)

PI Affiliation
Hiroshima University
PI Affiliation
Graduate school of Innovation and Practice for smart society, Hiroshima University

Additional Trial Information

Status
In development
Start date
2025-09-12
End date
2025-10-17
Secondary IDs
Prior work
This trial does not extend or rely on any prior RCTs.
Abstract
Drought is a severe and recurring problem in Malawi, a country with a high drought risk index. In 2024, drought impacted approximately 44.3% of the nation's crop area, with the Southern Region suffering the highest agricultural income losses. As a consequence, many farmers resort to migration as a coping strategy, leading to a steady 4.1% annual rate of internal rural-urban migration and a situation where 45% of the population considers emigrating. The primary objective of this study is to explore whether providing information on adaptive agricultural practices can reduce farmers' intentions to migrate due to drought. The study utilizes a Randomized Control Trial (RCT) to investigate how providing access to information on soil and water conservation techniques affects the migration intentions of farmers in a drought-prone area of Malawi. Participants will be divided into three groups: Treatment Group 1 (T1) will receive video-based information on soil and water conservation techniques, specifically Zai pits and mulching. Treatment Group 2 (T2) will receive the same information as T1, plus a hypothetical scenario where a non-governmental organization (NGO) provides implementation support. Finally, the control Group will receive no information. The main outcome measured is migration intention, assessed using a 5-point scale. A secondary outcome is the farmers' perceived effectiveness of the conservation techniques. It is hypothesized that this knowledge, especially when coupled with the prospect of implementation support, will empower farmers to adapt to drought conditions, making migration a less necessary option.
External Link(s)

Registration Citation

Citation
Khan, Ghulam Dastgir, Paikene Mangani and Harunobu Saijo. 2025. "The Impact of Access to Soil and Water Conservation Information on Migration Intentions: Evidence from Malawi.." AEA RCT Registry. September 12. https://doi.org/10.1257/rct.16580-1.0
Experimental Details

Interventions

Intervention(s)
Treatment Group 1 (T1): Will receive information on soil and water conservation techniques
Treatment Group 2 (T2): Will receive the same information as T1, plus a hypothetical scenario where a non-governmental organization (NGO) provides implementation support.
Control Group: Receives no information
Intervention (Hidden)
Participants will watch a video containing information on soil and water conservation techniques. Specifically the information will be:
1. What a Zai Pit looks like. How big and wide it should be. The materials needed to implement this. The benefits of using this method when there is bad rain/drought/dry spell. Testimony from a person who increased yield from this method even during bad rain/drought year.
2. What Mulching looks like, what materials can be used as Mulch, benefits of using mulch when there are bad rains/drought/dry spells. Testimony from a person who increased yield from this method even during bad rain/drought year.

T1: Information on Zai Pits and mulching only.

T2: Information on Zai Pits and mulching, plus a hypothetical scenario where an NGO will support the implementation of zai-pits and mulching in terms of labor and materials.
Intervention Start Date
2025-09-18
Intervention End Date
2025-10-17

Primary Outcomes

Primary Outcomes (end points)
Migration Intentions
Primary Outcomes (explanation)
Participants will be asked if they are interested in migrating, measured on a 5-point Likert scale

Secondary Outcomes

Secondary Outcomes (end points)
perceived effectiveness of the conservation techniques
Secondary Outcomes (explanation)
Participants will be asked how confident they are in producing enough yield during a drought. Measured on a 5-point Likert scale.

Experimental Design

Experimental Design
Participants will be randomly divided into three groups. Treatment groups 1 and 2 will receive treatment information on soil and water conservation techniques. The control group will not receive treatment information.
Experimental Design Details
Participants will be randomly divided into three groups. Treatment groups 1 and 2 will receive treatment information on soil and water conservation techniques. The control group will not receive treatment information. Data will be collected using an online survey on Qualtrics.
Randomization Method
Randomization will be done using the Qualtrics survey tool.
Randomization Unit
Individual farmer
Was the treatment clustered?
No

Experiment Characteristics

Sample size: planned number of clusters
766 smallholder farmers
Sample size: planned number of observations
766 smallholder farmers
Sample size (or number of clusters) by treatment arms
255 farmers T1, 255 farmers T2, 255 control
Since we will be using qualtrics randomizer, it is possible that the distribution of units into three arms is slighly different.
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
Assuming 700 samples and pair-wise comparison of two groups at a time, effect size of 0.25, variance equivalent to that of a uniform distribution, and 5% significance level, we obtain a power of 0.769, which is close to the 80% standard typically needed in RCTs.
IRB

Institutional Review Boards (IRBs)

IRB Name
Hiroshima University Research Ethics Review Board
IRB Approval Date
2025-08-18
IRB Approval Number
HR-LPES-003192

Post-Trial

Post Trial Information

Study Withdrawal

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Intervention

Is the intervention completed?
No
Data Collection Complete
Data Publication

Data Publication

Is public data available?
No

Program Files

Program Files
Reports, Papers & Other Materials

Relevant Paper(s)

Reports & Other Materials