LAHORE - Farmers should shun burning of wheat straw in fields because it causes a serious loss of nutrients and creates environmental pollution. Agriculture Department, Punjab has stated in a press statement here on Saturday that this straw after proper management can be converted into manure and its use along with chemical fertilizers not only improves the fertility level of the soil but also increases yields of crop on sustainable basis. Therefore, the Department has advised farmers to use appropriate machinery like primary tillage and wheat straw chopper instead of burning it.