H4-KH-16-D l factor Kth Depending on the application it is n Helical gear boxes H4

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introduced. Most of the physical treatments are residue-free processesand the grain quality generally remains unaffected. However, as compared with chemicalmethods, physical methods are normally expensive, but some of them are already in com-mercial use, whereas others are yet to be applied judiciously (. 2 Rajendran 4.1.1 Sanitation Before binning or before building bag-stacks, the storage facilities should be cleaned thor- oughly to eliminate insects breeding on sweepings, spillage, and residual grains. As infes-tation is likely to be carried in harvesting machinery, the combines should also be cleaned. Sanitation of the premises is an integral part of the protection strategies. It will be advanta- geous to give residual spray treatment with approved contact insecticides on the oorand wall surfaces and fumigate empty storages. In Australia, slurry of an inert dust(Dryacidea diatomacious earth coated with silica aerogels) is used for treating the insidestructures and is claimed to have given protection for 1 months (. The cleanlinessaround storage facilities is also important. Weeds and unwanted materials around the stores should be removed or destroyed, as they harbor the pests particularly the vertebrates. The sanitary condition of the grain matters lot in affecting its storage life. The impurities, dustand insects present in the grain must be removed by mechanical sieving or by aspiration. 4.1.2 Drying For longer storage life, the moisture content of the grain should be within the safe limit. However, in newly harvested grain the moisture content will exceed the limit, particularly in paddy and maize during wet seasons it will be 2% in Southeast Asia and Asia, and in wheat in Canada (4,. Before storing, grain has to be dried either by natural orarticial means to bring down the moisture to an optimum level to avert stack burningand spoilage by the microbial activity and mycotoxin production. In paddy any delay indrying affects germination, producing di