Friday, August 21, 2015

Monday, August 17, 2015

Groundnut post harvest managment methods


How do we know the crop is mature to be harvested ?
The easiest and most practical method to look for pod maturity is internal pericarp color.
Darkening of the internal surface of the pericarp is directly related to seed maturity (Fig 11). When
75–80% pods show internal pericarp darkening, it means the crop is at optimum maturity. 

What will be the moisture content on harvest ?

At harvesting, groundnut pods generally contain about 35% moisture, which must
be brought below 7% to provide optimal conditions in storage. The harvested
plants are well shaken to dislodge the soil from pods and are left in the fi eld
for 2–3 days for initial drying before stripping. In the postrainy season, when
higher temperatures (40-45°C) prevail at the time of harvesting, the pods must
be stripped immediately and dried under shade.

How to store groundnut for longer periods ?
Eco-friendly management of storage pests at farm and household level:
At farm level, groundnut is often stored as pods, and it may not be possible for
the smallholder farmers to provide high quality storage conditions. The pods
should be stored in polythene lined gunny bags or in some other safe storage
structures (small seed bins, earthen pots or metal drums) in a well-ventilated
and rodent free room. Only undamaged, well-dried clean pods should be stored
to avoid fungal and insect pests’ attack in the storage.
•   After 2–3 days of drying in the fi eld, when high temperatures (40-45°C)
prevail at the time of harvest, the pods must be stripped immediately and
dried under shade to maintain seed viability for a longer period.
•   Maintenance of optimum moisture content (below 7%) of seed, sanitation of
seed as well as storage space, and appropriate storage methods are always
critical in preventing the development and damage caused by storage pests.
In rural household situations where measuring moisture content is difficult.
see that the testa of the seed comes away with gentle pressure applied to the
seed between thumb and forefinger after thorough drying.
•  Clean the storage containers thoroughly and expose them to sunlight for a
couple of days before storing groundnuts.
•   In case of C. serratus, to prevent primary infestation from alternate hosts
(Tamarind, Acacia and Pongamia) avoid drying groundnuts near these host
trees.
•   In Vietnam, well dried pods are stored in earthen pots of 20-25 kg capacity
lined with dried banana leaves. The top of the container is fi lled with a
thin layer (one cm depth) of rice and then sealed with mud. This facilitates
effective storage against insect pests without affecting the viability.
•  Storing groundnut kernel with dried neem leaves (about 500 g of leaves for
10 kg kernel) in any sealed container can be effective.

Ref : http://oar.icrisat.org/215/1/591_09_IB84_PostharvestInsectPestsofGroundnut.pdf

Ref : http://www.n2africa.org/sites/n2africa.org/files/images/Post%20Harvest%20Handling%20Manual%20Zimbabwe%20%2831Oct%202013%29.pdf