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Encouraging Farmers to Use Organic Fertilizers: Evidence from Field Experiment among Tea Farmers.
Last registered on June 27, 2018

Pre-Trial

Trial Information
General Information
Title
Encouraging Farmers to Use Organic Fertilizers: Evidence from Field Experiment among Tea Farmers.
RCT ID
AEARCTR-0003084
Initial registration date
June 18, 2018
Last updated
June 27, 2018 6:42 AM EDT
Location(s)
Primary Investigator
Affiliation
HIROSHIMA UNIVERSITY-idec
Other Primary Investigator(s)
PI Affiliation
Institute of Social Science, the University of Tokyo
PI Affiliation
Hiroshima University
PI Affiliation
Hiroshima University
Additional Trial Information
Status
In development
Start date
2018-07-02
End date
2018-07-31
Secondary IDs
Abstract
Agricultural innovation is considered as an important factor in the development of agricultural activities. Fertilizer plays a critical role to improve agricultural productivity. However, the overuse of chemical fertilizer causes groundwater contamination, soil acidification and increase in greenhouse gases. Bio-compost is a type of organic fertilizer using microorganisms to break down organic and inorganic substances, which enriches soil quality and reduces environmental pollution. Nevertheless, the usage of organic fertilizer in general and the usage of bio-compost, in particular, are still low. This study aims to evaluate the impact of subsidy and information on the usage of bio-compost among tea farmers.
External Link(s)
Registration Citation
Citation
DAISAKU, GOTO et al. 2018. "Encouraging Farmers to Use Organic Fertilizers: Evidence from Field Experiment among Tea Farmers. ." AEA RCT Registry. June 27. https://doi.org/10.1257/rct.3084-2.0.
Former Citation
DAISAKU, GOTO et al. 2018. "Encouraging Farmers to Use Organic Fertilizers: Evidence from Field Experiment among Tea Farmers. ." AEA RCT Registry. June 27. http://www.socialscienceregistry.org/trials/3084/history/31239.
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Experimental Details
Interventions
Intervention(s)
Intervention Start Date
2018-07-02
Intervention End Date
2018-07-31
Primary Outcomes
Primary Outcomes (end points)
Take-up decision: whether farmers decide to purchase bio-compost or not;
Usage of bio-compost (amount): quantity of bio-compost used
Primary Outcomes (explanation)
Secondary Outcomes
Secondary Outcomes (end points)
Usage of bio-compost (area): the ratio of the area in which bio-compost is applied;
Usage of chemical fertilizer: quantity of chemical fertilizer used
Secondary Outcomes (explanation)
Experimental Design
Experimental Design
Target farmer households in each village will be randomly divided into 3 groups: comparison group, treatment group 1 and treatment group 2. Treatment group 1 will receive the subsidy while treatment group 2 will receive information. In the follow-up survey, we will collect the data about actual usage of bio-compost.
Experimental Design Details
We evaluate the impact of subsidy scheme and information provision on the take-up decision and the usage of bio-compost. The reference population of the experiment is made by those tea farmer households in Thai Nguyen province, a largest green tea area in Vietnam. Target farmer households in each village will be randomly divided into 3 groups: comparison group, treatment group 1 and treatment group 2. Households in comparison group will receive free shipping (up to 200kg) and general information about bio-compost. General information is provided through 2-minute video. The household in treatment group 1 will receive the same general information and free shipping to households in the comparison group. Moreover, they will get 50% subsidy in price (up to 200kg). The household in treatment group 2 will receive free shipping (up to 200kg) and information treatment (a 5-minute video). Information treatment has general information about bio-compost and information about successful farmers who used bio-compost. The former is as same as the information provided to households in comparison group and treatment group 1. The latter is the additional information. Investigators will visit each targeted household and conduct the lottery. After assigning the treatment status, the household has to make the decision to purchase bio-compost or not. If they agree to buy, a contract will be given to them. The bio-compost will be delivered to village center within 1-3 days. On delivery date, the household will receive bio-compost after showing the contract and making full payment. In order to eliminate information leaking, we will complete the field experiment in each village within a day. In the follow-up survey, we will collect the data about actual usage of bio-compost in each household. From that, we can evaluate the persistent impact of our treatments.
Randomization Method
Households are randomly selected from lists provided by village leaders. Subsequently, treatment assignment is done in each respondent's house by lottery.
Randomization Unit
Household
Was the treatment clustered?
No
Experiment Characteristics
Sample size: planned number of clusters
1134 households
Sample size: planned number of observations
1134 households
Sample size (or number of clusters) by treatment arms
378 households in the comparison group
378 household in the treatment group 1
378 household in the treatment group 2
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
According to previous studies ( Duflo et al., 2011; Carter et al., 2014), we set up standard deviation of 0.49 and expected treatment effect of 0.1. We would have 80% power.
IRB
INSTITUTIONAL REVIEW BOARDS (IRBs)
IRB Name
IRB Approval Date
IRB Approval Number
Post-Trial
Post Trial Information
Study Withdrawal
Intervention
Is the intervention completed?
No
Is 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