Perhaps you should try some spelling variations:
"Supply basin irrigation schemes." » "Supply basin irrigation scheme.", "Supply basin irrigation systems.", "Supply drip irrigation schemes.", "Supply farm irrigation schemes.", "Supply water irrigation schemes."
"Supply canal irrigation schemes." » "Supply canal irrigation scheme.", "Supply canal irrigation systems.", "Supply scale irrigation schemes."
supply basin » supply asia, supply based, supply design
supply canal » supply canada, supply annual, supply china

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