Estabelecimento do DRIS para Lima Ácida Tahiti na região Noroeste do Paraná

Abstract

Brazil has an area of 715,580 thousand hectares of citrus fruits (Orange and Lemon), resulting in a production in the year 2015 of 17,926,518.00 million tons, of which 47,391 thousand ha are of Lemon and ‘Tahiti’ Lime (IBGE, 2017), which demonstrates the importance of the activity for the country. In the state of Paraná, the Lemon / ‘Tahiti’ Lime area occupies an area of 1034 hectares, resulting in a production of 30,141 tons, generating a Gross Production Value (VBP) of R$ 50,637,384.00 million (1,8% of state fruit production), showing the importance of the crop to the state. The work was carried out between February 2015 and July 2016 (2014/2015, 2015/2016), in rural properties located in the municipalities of Santa Fé, Ângulo, Iguaraçu, Nova Esperança and Altônia, both in the state of Paraná . It was obtained the establishment of the DRIS norms for the nutritional diagnosis of Tahiti Lime (Citrus latifolia Tanaka) for the State of Paraná, using as standard the productivity of 32.5 t ha-1 (2014/2015 and 2015/2016 crops). It was observed in the data of the samples of the selected cut point (above 32.5 t ha-1) that in the agricultural year 2014/2015 the major deficiency was nutrient B (40%), followed by Mg (26%). As for nutrient contents, nutrients S (25%), Ca (20%) and K (18%) were observed. Already, in the results with the data of the agricultural year 2015/2016, deficiency of P (21%) was verified, followed by the nutrients B and Fe (20% both). In relation to the contents of excessive nutrients, one can observe K (21%), followed by nutrients N (16%) and Mn (14%). It is possible to define a criterion for choosing which matrix generated by the DRIS system to use at the field level, since the higher the productivity, the lower the IBN was obtained by calculating and analyzing the correlation (r) between the Nutritional Balance Index IBN) and DRIS matrices for the different productive levels. it was obtained the establishment of the DRIS standards for Tahiti Lime (Citrus latifolia Tanaka) for the state of Paraná, using as standard, productivity above 32.5 t ha-1.