Evidence-based Scaling of Improved On-Farm Storage among Smallholders (Tanzania)

Last registered on December 19, 2021

Pre-Trial

Trial Information

General Information

Title
Evidence-based Scaling of Improved On-Farm Storage among Smallholders (Tanzania)
RCT ID
AEARCTR-0008715
Initial registration date
December 17, 2021

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
December 19, 2021, 1:17 PM EST

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

Locations

Primary Investigator

Affiliation
University of Zurich / ETH Zurich

Other Primary Investigator(s)

PI Affiliation
University of Zurich / ETH Zurich

Additional Trial Information

Status
In development
Start date
2022-01-01
End date
2023-12-31
Secondary IDs
Prior work
This trial does not extend or rely on any prior RCTs.
Abstract
Reducing post-harvest storage losses creates opportunities for smallholder households to increase incomes and food security (Brander et al., 2021; Huss et al., 2021). Though simple, locally produced and affordable hermetic storage bags exist that minimize storage losses, their adoption among smallholders remains low (Channa et al., 2019). The limited adoption of hermetic storage bags is especially puzzling as their costs are relatively low (at about 2 USD per 100kg bag) and their effectiveness in reducing post-harvest storage losses has been thoroughly demonstrated (e.g. Likhayo et al., 2016; Ndegwa et al., 2016). This raises important questions on what kind of constraints smallholder farmers may face that limit their investments in hermetic storage, and hence constrain adoption. Currently, there is virtually no empirical evidence in this regard (Sheahan & Barrett, 2017).

In principle, hermetic storage solutions can provide economic benefits directly, through the value of abated losses, and, indirectly, through selling at better prices. The ability to store safely for an extended period of time gives farmers well desired autonomy to decide how much of their produce they would like to sell at which point in time, with sales in the lean season typically being associated with higher prices (Kaminski et al., 2016). In turn, farmers can keep and store food when prices are low - often at harvest.

Though hermetic storage solutions are generally low-cost, the required investment to adopt hermetic storage may still be considered substantial by resource-scarce smallholder farmers, who can only afford such expenses, if their investment pays off in due time. In addition to such financial constraints, the majority of smallholder farmers face liquidity constraints at the time the investment has typically to be made. Farmer’s risk perception is an associated, but central hurdle to adoption. It is inherently difficult for farmers unfamiliar with hermetic storage to judge the expected benefits and outweigh opportunities against the costs, in particular where no prior experience exists (e.g., from relatives or neighbours). Farmers may hence overstate the risks, and understate the benefits of investing in improved storage.

This project aims to analyse the role of these potential barriers relating to farmer’s (i) financial constraints, (ii) liquidity constraints, and (iii) risk perception with regards to the adoption of hermetic storage bags.
External Link(s)

Registration Citation

Citation
Brander, Michael and Matthias Huss. 2021. "Evidence-based Scaling of Improved On-Farm Storage among Smallholders (Tanzania)." AEA RCT Registry. December 19. https://doi.org/10.1257/rct.8715-1.0
Experimental Details

Interventions

Intervention(s)
The basic experimental intervention is a standard training on improved on-farm storage using a Training-of-Trainers (ToT) approach – an approach often used by NGOs. One representative of each farmer group allocated to this treatment participates in the ToT. Following the ToT, each trained farmer group representative trains her/his fellow farmer group members.

Subsequently, participating farmer groups are connected to local hermetic storage producers or distributors (e.g., agro-dealers) and offered to purchase hermetic storage bags. The purchase conditions and an additional intervention in the form of regular SMS-interactions through SMS-quizzes are randomly varied to analyse the role of (i) financial constraints, (ii) liquidity constraints, and (iii) risk perception.

Farmer groups randomly allocated to the control group arm do not receive an intervention but participate in the data collection, including the regular SMS-based surveys. The control group arm serves to identify socio-economic impacts of our intervention. At a later stage in the project and depending on project progress and funding, we may, however, provide them with an intervention in which case we would amend this registration.
Intervention Start Date
2022-01-01
Intervention End Date
2022-05-31

Primary Outcomes

Primary Outcomes (end points)
The primary outcome variable to be measured is hermetic storage bag adoption/purchase rates.
Primary Outcomes (explanation)
Data on hermetic storage bag adoption is collected when farmers are offered to buy hermetic storage bags. The data is recorded by both the merchant and an accompanying enumerator from among our project partners. Additionally, farmer self-reported adoption, based on survey data, is used at baseline and 2-years after the intervention, for comparison.

Secondary Outcomes

Secondary Outcomes (end points)
As secondary outcome variables, we measure household food security, income and poverty, and local market prices over the course of two full harvest cycles among all participating farmers (by means of weekly SMS-based surveys).
Secondary Outcomes (explanation)
To measure self-assessed food security, we use the reduced Coping Strategies Index (rCSI), and apply standard weights and thresholds for classification in food (in)security categories (Maxwell et al., 2008; Maxwell et al., 2014). To assess poverty and income, we use the Progress out of Poverty Index (PPI) to analyse medium-term effects (Desiere et al., 2015), and, to track short-run effects, net-income from crop sales among participating farmers (calculated as the difference between crop sales revenues and crop purchase expenditures). To analyse potential heterogenous treatment effects, we further collect socio-demographic data.

Experimental Design

Experimental Design
We implement a cluster randomized control trial (RCT) to study the role of (i) financial constraints, (ii) liquidity constraints, and (iii) risk perception in smallholder farmer’s decisions to adopt hermetic storage. The RCT is implemented in Tanzania (Morogoro, Dodoma, Rukwa and Katawi administrative regions) with a targeted sample size of 8’000 smallholder farming households.
Experimental Design Details
Randomization Method
To allocate clusters to different treatment arms, we use a blocked randomization design (c.f. Gerber & Green, 2012).
Randomization Unit
Clustering at village-level (treatments T1 and T2); clustering at individual-level (treatment T3)
Was the treatment clustered?
Yes

Experiment Characteristics

Sample size: planned number of clusters
~180 villages
Sample size: planned number of observations
~8000 farmers
Sample size (or number of clusters) by treatment arms
Approximate numbers:
36 villages control (no ToT Training)
144 villages in treatment, out of which:
- 36 villages T1 yes - T2 no
- 36 villages T1 yes - T2 yes
- 36 villages T1 no- T2 yes
- 36 villages T1 no- T2 no
+ at individual level: randomization of T3
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
IRB

Institutional Review Boards (IRBs)

IRB Name
University of Zurich
IRB Approval Date
2021-04-20
IRB Approval Number
OEC IRB # 2021-023

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