Evaluation of NPK 8-30-20 with gypsum addition compared to fertilization employed in the region for the production of potato (Solanumtuberosum L.)

Sidnei Osmar Jadoski, Marcio Furlan Maggi, Adenilsom dos Santos Lima, Douglas Jobim Vieira, Rafael Wazne

Abstract


Different forms of fertilizer management are employed by potato farmers, and from time to time, it appears a receipt to fertilize the crop. However, one should pay special attention to nutrition and fertilization of the potato as the relative demand of fertilizer per unit area in culture is high. The objective was to evaluate the use of NPK 8-30-20 with the addition of gypsum compared to NPK 4-14-8 (regional standard treatment) in the production of potato. The study was conducted at the Research Unit in Potato Production and Microclimate on Agriculture, Campus CEDETEG at UNICENTRO in Guarapuava - PR. The treatments were: T1 - 3.5 t ha-1 NPK 4-14-8, T2 - 3.5 t ha-1 NPK 4-14-8 over the application of 3 t ha-1 gypsum; T3 - 1.75 t ha-1 NPK 8-30-20, T4 - 1.75 t ha-1 NPK 8-30-20 plus the application of 3 t ha-1 gypsum, T5 - 1.75 t ha-1 NPK 8-30-20 plus the application of plaster to make up the difference between fertilizer. The cultivation of potato was held on December 23, 2008 and the cultivar used was Agatha. The seed used was Generation 01 and tubers of class II. The density used was 50.000 tubers per hectare. The experimental design was completely randomized design with five treatments and four replications. It was evaluated the productivity and classification of tubers of the size and incidence and severity of common scab (Streptomyces spp.) and silver scurf (Helminthosporium solani Dur. And Mont.) in the tubers. Statistical analysis was performed by ANOVA test and mean comparison by Tukey test (5%). Classification of the tubers was performed according to the diameter classes of the Ordinance No. 69 MAP of February 21, 2005. The use of manure at 5 t ha-1 NPK 4-14-8 over the application of 3 t ha-1 gypsum and 1.75 t ha-1 of 8-30-20 NPK plus the application of 3 t ha-1 gypsum causes the best results of yield of potato tubers and better classification. The application of gypsum was important to reduce the incidence of common scab independent of the formulation and application of NPK without addition of gypsum predisposes the crop to a higher incidence of scabies.


Keywords


fertilization on potato; gypsum; common scabies; silver scurf



DOI: https://doi.org/10.5777/paet.v3i1.661