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Onion Is Associated With Micro-organisms Which Are Capable Of Causing Spoilage
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CHAPTER ONE
1.0 INTRODUCTION
1.1 BACKGROUND INFORMATION
Onions is a vegetable crop and ancient in nature if is through to have
been domesticated in the central Asia. It is one of the oldest vegetable
cultivated by man for food. In the world onion buld are found in
ancient Egypt, India, China and Europe during the middle ages, and in
the late sixteenth or early seventeenths centuries, it spread to the new
world by the Spaniards. The crop is now wide spread in both temperate
and tropical regions with Europe as the largest producers (cobley and
Steele, 1976).
In the tropic most onions are grown with
irrigation during the relatively cool dry season in semi arid region,
they are not good crop for hot wet tropic. Onions can be grown under a
wide range of climatic condition but they succeed best in a mild climate
without excessive rainfall or great extremes of heat and cold. They are
not suitable to regions with heavy rainfall in the lowland humid
tropics. Cool conditions with an adequate moisture supply are most
suitable for early growth followed by warm drier condition for
maturation, harvesting and curing. They can be grown on a variety of
soils, but the soil should be retentive of water, non – packing and rich
in nutrient, a good fertile loam usually gives the best result. They
may be grown successfully on peat soils. The soil optimum pH is about
6.0 – 7.0 (alkaline) (carl and Hall, 1986).
In storage a
specific environment must be provided for the onions, if a high quality
product is to result. Storage losses are a function of storage
environment as well as the condition and cultural practices used during
the growing season. Proper control of storage environment can however,
significantly extend the storage season from that which would result
from storage environment that were not matched to the condition of the
onions when placed in storage (carl & Hall, 1986).
Onions may be stored in bulk or may be placed in palletised bins that
are stacked in a storage structure. The use of bins may make handling of
onions convenient but it does make ventilation of the onions more
difficult. Improved bins design may alleviate the ventilation problems
in future (cobley and Steele, 1976).
Onions are packed
locally by using basket and jute bags these packaging material come
locally from palm; bamboo and fibrous jute trees, also they have
different sorts and sizes. These packaging materials have the function
for transportation and storability of the onions. Again these packaging
material are locally available and relatively cheap. Apart from these
few advantages mentioned they have no barrier to dust, not suitable for
measuring weight and can easily be crushed which might lead to damage of
the onions.
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ABSRACT - [ Total Page(s): 1 ]Onion is associated with micro-organisms which are capable of causing spoilage. Onions with rots were examined microscopically. A solution of it was made and the serial dilution of 1:10-1¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬ to 1:1-5 were made from 10ml of the onions sample. From the dilution, 1ml of each diluent was plated on nutrient and saboor and dextrose agree to permit the grouth of the common bacterial and fungi, from the roffen onions. Duplicate plates were p ... Continue reading---
