Impact of heat stress among workers in naturally ventilated greenhouse

Publication Date : 27/06/2016


Author(s) :

Dr J. N. Mishra , Dr S. K. Mohanty.


Volume/Issue :
Volume 2
,
Issue 7
(06 - 2016)



Abstract :

Natural ventilated Greenhouses are the structures which gives a microclimate upto certain extent that make the plants to grow well in an unfavorable climate. These are extremely helpful in a particular period of year when some plants cannot be grown in open field. But Greenhouses cannot be considered a very suitable place to work for the workers specially in early or in summer season. Workers have to work in unfavourable conditions and exposed with stress to the body from physical activity can be dangerous to worker’s health. The experiment was carried out to study the impact of heat stress of workers in a naturally ventilated greenhouses in the Horticultural campus of College of Agriculture, OUAT, Bhubaneswar, Odisha in 2014. During 9th week the average greenhouse temperature and relative humidity was around 400C and 50 per cent respectively which is unsuitable for agril. labourers to work inside the greenhouse from 12 to 2 PM. These average values rose over 500C of temperature as well as 55 per cent relative humidity during 12th, 13th and 14th week in which it was impossible to work from 12 to 3 PM. Again during 8thand 9th week the nature of work i.e. field preparation or digging of soil inside greenhouse from 10 to 4 PM was again above the limit suitable to workers. The value of working heart rate(WHR) increased upto 120 beats/min with a corresponding value of oxygen consumption rate 0.939 lmin-1 after 20 minutes of digging. However the value in case of simple operation like weeding remain with acceptable limit. Hence to prevent from heat stress the workers should allow to work inside greenhouse from 6 to 10 AM in the morning as well as 5 to 7 PM in the evening. No doubt the greenhouse provides a conducive climate for plant growth, yet a greater overall knowledge and preventive measures would help the workers to avoid risks of inhouse work. Keywords : Greenhouse, Working Environment, Working heart rate, Health risk


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