The present study was carried out in order to evaluate the effects of irrigation depths applied through drip and presence/ absence of soil cover in onion yield (ETc): 0, 22, 45, 75 and 100% (0, 155, 220.6, 320.5 and 372,7mm in +S condition and 0, 145.5, 207.6, 285, 351, (ETc): 0, 22, 45, 75 e 100% (0; 155; 220,6; 320,5 e 372,7mm na condição SC e 0; 145,5; 207,6; 285
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