Agricultural is essentially a combination of process designed by man to promote plant growth in a semi controlled environment. Climate together with soil are the main constraints to agricultural. Among the elements of climate influencing plant growth the temperature,rainfall, and sunshine are directly involved in various stages of plants growth from germination to grain formation. The water requirements rainfall/snowfall of plants can be met even in water deficit areas,by man's ingenuity of storage and conservation of water through dams canals,tube Wells, and karez. The sunshine in subtropical Pakistan is plenty averaging eight hours or more per day. The temperature variations both diurnal and annual are large. Each crop has a minimum optimum and maximum temperature requirements and these can not be artificially created on a scale covering the farm land. Effective day and effective night temperatures are more appropriate for agricultural studies..!!!!
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