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Fertilization of irrigated conilon drip coffee: fertigation x enhanced efficiency fertilizers Fertigation is a widespread technology in coffee cultivation; however, with the insertion of new fertilizers technologies, new studies are required. This study aims to evaluate the influence of application types and fertilizers sources on the electrical conductivity and pH of the soil solution in the wet bulb as well its influence in the development and production of drip irrigated conilon coffee. The study was conducted in São Gabriel da Palha, Espírito Santo (Brazil), using 12V clone variety INCAPER 8142. The experiment was designed in randomized blocks (DBC) with six treatments and four blocks. The adopted treatments were: T1 Control / nitrogen and potassium fertilization applied via soil: urea and potassium chloride; T2 Nitrogen and potassium fertilization applied via soil : urea and potassium chloride with release controlled; T3 Nitrogen and potassium fertilization applied by fertigation: urea and potassium chloride; T4 Nitrogen and potassium fertilization applied by fertigation: ammonium nitrate and potassium sulfate; T5 Nitrogen and potassium fertilization applied by fertigation: ammonium nitrate and potassium nitrate; T6 Nitrogen and potassium fertilization applied via soil: urea and potassium chloride with controlled release in the period from October to March (rainy season) and nitrogen and potassium fertilization applied by fertigation, ammonium nitrate and potassium sulphate in the period from April to September (dry season). The biometric evaluations of the plants were: height, length of the first branch and number of nodes in the first plagiotrophycal in addition to production per plant and productivity estimate. T1 and T3 treatments using immediate solubility of urea and T4 ammonium nitrate have provided large amount of nitrogen in the ammonium form, causing increased acidification in the bulb. In contrast the T2, T5 and T6 treatments had lower acidification, with statistically significant differences in the pH variation in two depths analyzed from 18 months of treatment application. In treatments T2 and T6 it was observed lower initial salinity in the evaluation at 90 days after planting through the EC reading. To biometric assessments, treatments T2, T4, T5 and T6 differ statistically from T1 and T3, influencing plant height, length and number of nodes in the first plagiotrophycal.

Adubação do café conilon irrigado por gotejamento: fertirrigação x fertilizantes de eficiência aprimorada