WATER QUALITY IN IRRIGATED AREA FOR PRODUCTION OF ROBUSTA COFFEE (COFFEA CONEPHORA) IN THE AMAZON

The present work attempts to characterize Robusta coffee producing properties located in the São Miguel do Guaporé– RO river basin and analyze water quality. Collections were carried out on 20 properties and the following parameters were evaluated: Calcium, Electrical Conductivity; Total Hardness; Total Phosphorus; Magnesium; pH; Sodium, Sodium Adsorption Ratio, salinity and sodicity. The pH ranged from 5.2 to 6.5 and 55% of the samples presented results within the limit established by CONAMA 357/2005, and around 70% of these waters presented a phosphorus content outside the recommended levels. The water classification regarding salinity and sodicity was C1S3, where C1 means that it does not present any risk of salinity and S3 indicates a severe problem when there is infiltration into the soil due to the sodicity of the water. The results obtained may add technical knowledge on the São Miguel do Guaporé river basin, assisting in sustainable management of soil and water.