Avaliação do nitrato de amônio hidropônico no enraizamento de mudas micropropagadas de mandioca

Abstract

The cassava (Manihot esculenta Crantz) has important commercial aspects in Brazil. The carbohydrate in its roots is a primary source for numerous uses and products, however, the propagation of its seedlings is a transmission vector of diseases present in the soil and in the affected plant itself. As a means of preventing the spread of diseases through cassava seedlings, micropropagation is the solution for providing rural producers with healthy and more productive plants. Micropropagated seedlings have a higher production cost mainly due to the use of Ammonium Nitrate P.A. The objective of this work was to validate the replacement of Ammonium Nitrate P.A. by Hydroponic Ammonium Nitrate in cassava seedlings rooting. Both are nitrogen sources for plants established in vitro, but with different chemical purities. The analyzed variables were number of leaves (NF), number of internodes (NE), number of roots (NR), plant height (AP) and mortality of explants of micropropagated cassava seedlings. The experiment was established with a completely randomized design, with treatments consisting of the application of doses corresponding to 1.65 g L-1 of Ammonium Nitrate P.A, and the others with doses of 2.38 g L-1, 4.75 g L-1 and 7.12 g L-1, from Hydroponic Ammonium Nitrate. Hydroponic Ammonium Nitrate showed equity as Ammonium Nitrate P.A., qualifying as a source of nitrogen supply gor the cassava plant in vitro.