Banca de DEFESA: CLODOALDO SPADETO AMBROZIM
Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.DISCENTE : CLODOALDO SPADETO AMBROZIM
DATA : 27/02/2019
HORA: 14:00
LOCAL: Sala de pós-graduação do PPGF
TÍTULO:
PHYSIOLOGICAL EVALUATION OF BLACK PEPPER (Piper Nigrum L.), UNDER DIFFERENT IRRIGATION LEVELS AND CONTROLLED RELEASE FERTILIZER DOSES
PALAVRAS-CHAVES:
Automated irrigation, plant development, plant nutrition, abiotic stress, physiological parameters.
PÁGINAS: 76
GRANDE ÁREA: Ciências Agrárias
ÁREA: Agronomia
SUBÁREA: Fitotecnia
ESPECIALIDADE: Produção de Mudas
RESUMO:
Black pepper is a plant cultivated mainly in countries of tropical climates, and in Brazil presents great economic importance in the states of Pará and Espírito Santo. Despite this, little information is available in the literature, especially in relation to the water and nutritional needs of the crop. Therefore, the objective of this work was to evaluate the production of black pepper seedlings under different nutrient doses, as well as the physiological status of the crop when submitted to water stress. For this, two experiments were conducted in the Horticulture sector of the Agronomy Institute of the Federal Rural University of Rio de Janeiro. In the first, pepper stakes (cv Bragantina) were pre-rooted for 60 days in washed sand, and then transplanted in polyethylene tubes with a capacity of 280 cm3. The design was completely randomized in a uni-factorial scheme with 4 doses of controlled release fertilizer (concentrations of 0.0, 2.5, 5.0 and 10.0 kg m-3) (osmocote®), with 10 replications. After 30 days of repication, the height of the plants was periodically measured up to 120 days. At the end of the experiment, destructive analyzes were carried out to evaluate fresh and dry masses of shoot and roots, leaf number and leaf area, as well as chemical analysis of shoots, roots and substrates. In the second experiment, pepper plants (cv Bragantina) with approximately 120 days were cultivated in 5.0 L pots and submitted to different water supplies, corresponding to 100, 78, 58 and 32% of the volume applied by an automatic irrigation controller. The experimental design was in randomized blocks, with 4 treatments and 6 replicates. When wilt symptom was detected in about 50% of the plants of a treatment, it was rehydrated and subjected to the corresponding treatment again. The chlorophyll content and stomatal conductance (gs) were measured periodically during the 33 days of evaluation, while leaf osmotic potential (Ψf) and relative water content (RWC) leaf were measured at 22, 28 and 31 days of water restriction (DWR). In relation to the first experiment, higher plant height and dry and fresh shoot mass were verified in seedlings produced with higher doses of fertilizer, as well as higher leaf area rates and chlorophyll a and b indexes. Variations in the macro and micronutrients contents were verified between the aerial part and the root of the plants according to the applied doses. The different levels of irrigation (second experiment) influenced the values of Ψf and RWC in black pepper plants. In those submitted to the lowest irrigation level (32%), total stomata closure was observed at 28 DWR, showing a small recovery after rehydration. Values of a, b and total chlorophyll were also affected by irrigation levels. It was possible to conclude that: black pepper seedlings produced with doses of 10.0 kg m-3 of controlled release fertilizer present higher height and fresh and dry root masses; there were variations in the contents of nutrients in relation to the aerial part and root in black pepper plants; black pepper plants are sensitive to more stringent water stress, with partial recovery of Ψf, RWC and stomatal conductance in 32% water replenishment treatment.
MEMBROS DA BANCA:
Presidente - 1224578 - DANIEL FONSECA DE CARVALHO
Externo ao Programa - 3036150 - JUNIOR BORELLA
Externo à Instituição - ROBSON BONOMO