Banca de DEFESA: MATEUS MARQUES BUENO

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : MATEUS MARQUES BUENO
DATE: 31/07/2020
TIME: 08:00
LOCAL: Sala 24 - Departamento de Solos
TITLE:

Optimization of water use in the production of Atlantic Forest species using automatic irrigation management, substrate with biosolids and shading levels

KEY WORDS:

Seedling quality; water need; water use efficiency.

PAGES: 79
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Ciência do Solo
SPECIALTY: Física do Solo
SUMMARY:

The increase in demand for native tree species seedlings makes it important to optimize the production factors that affect quality parameters, such as water supplementation and luminosity levels. The lack of information on the tree species water requirement promotes waste of water in the of seedlings production in nurseries. Water use efficiency, growth indicators and quality parameters were evaluated in six native species of the Atlantic Forest, by conducting experiments from September 2018 to December 2019. Two groups of experiments were carried out: (i) in the greenhouse, in the seedling production phase, when four levels of water replacement were applied by dripping to seedlings of Schizolobium parahyba (Vell.) Blake, Cytharexylum myrianthum Cham. and Ceiba speciosa Ravenna, and posteriorly, with uniform water replacement; and (ii) on outdoor benches, when seedlings of the Dalbergia nigra (Vell.) Allemão ex Benth., Apuleia leiocarpa (Vogel) JFMacbr and Hymenaea courbaril L. species were produced in four shading levels, simulating commercial nursery conditions. In all experiments, in the seedling phase, automated irrigation management was used, with instant storage of the number of actuations and the volume of water applied. The biosolid, from the treatment and stabilization of the sewage sludge, was used as a substrate in the seedling phase (280 cm^-3 tubes) and sandy soil material in the initial growth phase (pots 18 dm^-3). In general, the seedlings of the first group of experiments showed development above the standards applied for planting in the field before 80 days after emergence (DAE), for treatments with greater water replacement of seedlings. For treatments with less water replacement, the seedling recovery was fast and the growth was satisfactory, after 30 days after planting in pots. In the seedling phase, S. parahyba, C. myrianthum and C. speciosa received, respectively, 2.40, 1.08 and 0.85 L per plant, for treatment with replacement of 100% of the water requirement (V4); in the initial growth phase (230 DAE), the total water volumes were, respectively, 70.0, 50.3 and 52.7 L per plant. The tree species in the first experiment group showed low sensitivity to growth in response to water deficit, and distinct water efficiencies between the seedling and initial growth phases, with the highest height (80.7 and 17.0 cm L^-1 ) and diameter values (2.1 and 0.5 mm L^-1) in the two phases for C. speciosa. For the second group of experiments, the total volumes of water applied were 70.0; 50.3 and 52.7 L per plant, respectively, for D. nigra, A. leiocarpa and H. courbaril, presenting better results in the shading levels of, respectively, 37 and 58%; 37% and in full sun. Higher water productivity of irrigation (PAi) for the D. nigra and A. leiocarpa species are associated with the seedlings of the treatments that showed better growth and quality performance. It can be concluded that the application of water in response to the water needs of seedlings of tree species, via automated irrigation management, and the identification of the ideal shading rate guarantee the production of quality seedlings with low water volume.

BANKING MEMBERS:
Presidente - 1224578 - DANIEL FONSECA DE CARVALHO
Externo ao Programa - 2132414 - MARINALDO FERREIRA PINTO
Externo ao Programa - 2136627 - NIVALDO SCHULTZ
Externo à Instituição - ALEXANDER SILVA DE RESENDE - EMBRAPA
Externo à Instituição - CARLOS RODRIGUES PEREIRA - UFF