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In the field of agriculture the most important part is: to get the information about the fertility of soil and secondly moisture content of soil. After measuring these two factors a farmer can start sowing of seeds. In this paper, the authors are giving the brief outline about different techniques to measure soil fertility in order to check the productivity of crop. They are using here two devices to measure the constituents (potassium, phosphorus, nitrogen) of soil. After measuring fertility, they are proposing a system of automatic drip irrigation through microprocessor to measure the moisture of soil.
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