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Yield of a potato clone under mineral and organic fertilization The study aimed to evaluate the response to total production, marketable production and production by tuber size classes; dry matter content and internal physiological disorders internal brown spot, hollow heart and black heart of potato tubers clone IAC 2.5 subjected to three rates of mineral fertilizers 04-14-08 (N-P2O5K2O) and ammonium sulphate, supplemented or not with an organic compost trademark Provaso. The trial was conducted from October 2012 to February 2013, at the Research & Development Unity of Agência Paulista de Tecnologia dos Agronegócios (APTA), in Itararé, SP, Brazil (lat. 24o16’06’’S; long. 49o12’19’’W), and altitude of 1200 m. The treatments were arranged in a 3x2 factorial scheme in a completely randomized block design, with four replications. The treatments consisted of three rates of 04-14-08 at planting and ammonium sulphate in dressing fertilization, follow respectively: 2150 kg ha + 200 kg ha; 3225 kg ha + 100 kg ha; e 4300 kg ha + 0 kg ha, with (5000 kg ha) or without organic compost. 04-14-08 rates were calculated based on the soil analysis and 100, 150 and 200% on P2O5 recommendation for the potato crop, and for dressing fertilization, was adopted quantities respectively 40, 20 and 0 kg ha of N and 44, 22 and 0 kg ha of S. The experimental plot consisted of four rows of 3.5 m each, for a total of 40 plants. Useful plot was the 16 plants from central rows. The spacing was 0.35 m between plants in the row and 0.8 m between rows. The data were submitted to analysis of variance and treatment means were compared by Tukey test (p < 0,10) using the statistical program Sisvar. Taking in account the conditions in wich the trial was conducted, a high yield of marketable tubers (52.4 t ha) for the clone IAC 2.5 by 3225 kg ha of 04-14-08 + 5000 kg ha of organic compost in planting and 100 kg ha of ammonium sulphate in dressing fertilization suggests the importance of organic matter complementing in increasing the efficiency of mineral fertilization.

Produtividade de um clone de batata submetido às adubações mineral e orgânica