Nitrogen mineralization in soils fertilized with vinasse

• Grant number: 18/16216-6
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: October 01, 2018
• End date: September 30, 2019
• Field of knowledge: Agronomical Sciences - Agronomy - Soil Science
• Principal Investigator: Mara Cristina Pessôa da Cruz
• Grantee: Amanda Manduca Rosa da Silva
• Host Institution: Faculdade de Ciências Agrárias e Veterinárias (FCAV). Universidade Estadual Paulista (UNESP). Campus de Jaboticabal. Jaboticabal , SP, Brazil

Abstract

In areas fertilized with vinasse, the total amounts of N applied are relevant, but in general it is not known how much N is available, neither the transformations that it causes in the N of the soil. It is only known that there is a need to complement N doses for sugarcane with industrial fertilizers. In vinasse, N predominates in organic form and needs to be mineralized to be absorbed by plants. In order to obtain estimates of the mineralized N from the vinasse application it is necessary to determine the rate of mineralization in the laboratory and in the field. With the present project we intend (I) to evaluate the N mineralization rate in a laboratory incubation test using soils treated with vinasse, and (II) to correlate the mineralizable N with N absorbed by sugarcane plants. Two experiments will be carried out under controlled conditions, both combining three soils (sandy, sand-clay and clayey) collected in the 0 to 20 cm layer and three doses of vinasse (0, 75 and 150 m3 ha-1). In the experiment in pots will be used a completely randomized design with four replicates. In the pots will be transplanted two pre-sprouted sugarcane seedlings, which will grow for 60 days. At the end of the experiment the N absorbed by the plants (Nabs) will be obtained. The mineralized N will be evaluated at 14; 21; 28; 35; 42; 49; 56 and 63 days of incubation. The obtained data will be adjusted to the exponential equation of first order kinetics to obtain the potentially mineralizable N (N0) and the mineralization constant (k), and the N0 and N mineralized accumulated at 63 days will be correlated to the Nabs by the sugarcane plants.

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

DA SILVA, AMANDA MANDUCA ROSA; LOPES, IVA GUIDINI; BRAOS, LUCAS BOSCOV; DA CRUZ, MARA CRISTINA PESSOA. Nitrogen Mineralization and Sugarcane Growth in Soils Fertilized with Vinasse. SUGAR TECH, v. 22, n. 6, JUL 2020. (18/16216-6)