IFPRI Cocoon Storage

Exploring new options for off-farm storage in Bangladesh

Background

In Bangladesh, farmers sell about one-third of their harvested paddy just after harvesting, store another one-third for sale after two to three months, and store the remaining one-third for house hold consumption over the next six months. This pattern of sales and home consumption means that the majority of the country’s grain is stored at the farm level. On-farm storage may occur in jute sacks, woven dole, loosely fitted plastic drums, metallic bins, or open mounds on the floor. Storage at husking mills is typically in jute bags in open warehouses. Some automatic or semi-automatic mills have more modern storage facilities, but the capacity is very low,and only a small share of privately owned grain is stored in modern silos.

The Government of Bangladesh’s Modern Food Storage Facilities Project (MFSP)aims to improve storage of the country’s rice supply. While this would improve the storage of publically procured and distributed rice, a considerable amount of the country’s paddy crop is stored in private rice mills or remains in possession of farmers. Reducing losses in these locations would increase the amount of grain available for consumption.

Project Information

One path to addressing storage losses in the private sector could be to encourage private off-farm storage by millers or other intermediaries using low cost, hermetic storage cocoons, possibly in combination with warehouses (go downs or capacity of local storage depots). This project was designed to demonstrate the use and functionality of hermetic cocoons and train practitioners in their use.

Objectives

Researchers at Bangladesh Agricultural University are testing large-scale off-farm hermetic grain storage techniques to determine the feasibility and effectiveness of these options for long-term storage. Several 5-ton capacity hermetic cocoons have been set up alongside traditional rice storage practices for a period of 4 months at the Moti AutoRice Mill, a private rice mill. The specific objectives of this study are:

  • To train and pilot use of hermetic cocoons for paddy storage in isolation of warehouses and in conjunction with them;
  • To assess the viability of alternative hermetic cocoon-warehouse models for storage when used by new trainees;
  • To assess cost economic return to off-farm hermetic storage of paddy by private sector agents using alternative cocoon and warehouse technologies;
  • To assess different business models including public-private-partnership for off-farm grain storage, based on trainee capacity and performance, and develop instructional materials.

Experiment Design

Researchers take regular readings for oxygen, carbon dioxide, moisture and humidity levels. The project will include use of multiple cocoon technologies differing by material (1250g/m2PVC; 205g/m2laminated PE and 97.5g/m2PE), and placement (indoors or exposed). The capacity of the cocoons will be 5 ton. Paddy will be dried to a moisture content of between 12 to 14 percent (current miller practice), placed in 50 kg jute bags, and stored in five different technologies (shown below).Table 1: Storage environment and size of the cocoon

Material and EnvironmentPVC indoorsPVC exposedLaminated PE indoorsLaminated PE exposedPE indoors
Size5 ton5 ton5 ton5 ton5 ton

Engineering performance of the different cocoons will reflect the effectiveness of the technology-training, will be shared in the closing training to help trainees understand the impact of the technologies, and will inform the content of future training and technology transfer. Performance parameters to measure as part of this demonstration and training are:

  1. Air tightness, variation of moisture content, ambient humidity and temperature over a three month period;
  2. Dry inspection (grain color, damage grain, insect and mold infestation), milling quality (head rice recovery and broken rice %), germination rate (seed) and storage losses over three months;
  3. Change of O2and CO2 level for first 28 days;
  4. Resistance to damage, damage in handling, and durability of material at beginning and end of storage period.

Two rounds of experiments took place, to allow comparison of results in two different climatic seasons:

Following the Amman storage season (January to April)and the more rainy and humid Boro storage period(July to September).

Outcome & Results

  • Project is still in progress.