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Improved Pit Storage Method for ginger rhizomes in Nepal
In the predominantly rainfed area of Surket, Ginger is raised either as a sole crop, or as an intercrop. Seed rhizomes are usually planted during March-April. Most of rural families living in remote places follow traditional methods for cultivation and storage, which are usually eco-friendly, less expensive, and utilize local resources, knowledge and labour. The improved pit storage method provides cool conditions, ensuring freshness for prolonged storage. Ideal storage conditions should have a temperature of 12-140C and a relative humidity of 65-75%. Under these conditions, Ginger seed rhizomes can be easily stored for 5-6 months without damage and deterioration in quality as it will minimize shrinkage, rhizome rot and improve germination capacity. Approximately 350 kg of Ginger rhizomes can be stored in one pit.
The objective of the practice is toimprove and maintain the quality of Ginger rhizomes selected for seeds through improved pit storage technology.
Implementation of this practice/technology
To implement a proper ginger pit storage:
- Disease free and vigorous rhizomes for seed are selected to be stored immediately after harvest. For this purpose, healthy and disease-free clumps are marked in the field when the crop is 6 - 8 months old and still green.
- Rhizomes are disinfected with fungicides and pesticides.
- A circular or rectangular pit of about 1-2 m depth is dug in a shady and well-drained area, i.e. under the shade of a tree, provided water does not enter the pits.
- Pit walls may be coated with cow dung and disinfected with the same solution used in step 2 for rhizomes. If this is not possible, fire should be lit inside the pit to improve hygienic conditions within the pit.
- Prior to storage of the rhizomes, the top of the pit (up to 6”) is covered with grass and soil and is raised slightly above ground level to prevent entry of rainwater into the pit.
- A 3-4 cm layer of rice husk, saw dust, straw or dry grass should be placed in the bottom of the pit to serve as a cushion. Ginger rhizomes are placed in layers with 1-2 cm of sand/straw layers in between.
- The pit is covered by a wooden plank with holes and plastered with thatch and soil or cow dung in an oval shape.
- A temporary thatch roof is made over the pit to lower the inside temperature and protect it from water entry. Ventilation inside the pit can be maintained with the help of a pipe.
Pits are to be inspected every 20 days approximately to remove shriveled and disease affected rhizomes, and dried every 2 months to protect them from insect pests and molds.
Technical, economic, financial, social and environmental attributes of the technology: Improves efficiency of storage through improvements on traditional system/Maintains quality of ginger rhizome selected for seed /
Factors underlying success: Temperature and relative humidity in the improved storage is well maintained/Quality of ginger rhizome selected for seed improved/Provision of training to farmers/ Good quality seed rhizomes available for planting/
The Natural Resources Management and Environment Department provides leadership, technical and policy advice and knowledge towards the sustainable use of the earth’s natural resources (land, water, genetic resources and biodiversity). The Impact, Adaptation and Environmental Sustainability team of the Climate, Energy and Tenure Division (NRC) develops the knowledge base on the impact of climate, climate change and climate variability on agriculture, and facilitates the use of this information and knowledge through field projects. The team also supports capacity development at national level by supporting governments to integrate disaster risk reduction in the agriculture sector as well as identifying, testing and validating in cooperation with various partners climate change adaptation and disaster risk reduction good practice options to build resilience of all actors in agriculture to the impact of climate change and extreme weather events.