Banca de DEFESA: GEAN CORRÊA TELES

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : GEAN CORRÊA TELES
DATE: 28/09/2020
TIME: 08:30
LOCAL: Video-conferêncua
TITLE:

Physiological evaluation and growth of black pepper (Piper nigrum L.) in field conditions, under different water supplies

KEY WORDS:

Irrigation levels, water demand, photosynthetic efficiency

PAGES: 65
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Fitotecnia
SPECIALTY: Fisiologia de Plantas Cultivadas
SUMMARY:

Black pepper (Piper nigrum L.) is the most important spice sold worldwide and it is used on a large scale as a condiment and the meat and canning industries. Brazil is among the largest world producers, with the states of Pará and Espírito Santo the main responsible for the cultivation and production of black pepper. In commercial crops, irrigation systems have been used contributing to the increase in productivity, despite the lack of correct management and the availability of information on the water needs of the crop. The objective of this research was to evaluate the influence of water supply levels on the growth of black pepper culture in field conditions. The study was developed in the Horticulture sector of the Agronomy Institute of the Federal Rural University of Rio de Janeiro, from April / 2019 to May / 2020. The black pepper seedlings, cv. Bragantina, with 6 to 8 leaves were grown in plastic containers of 25 L installed in an open field and submitted to different irrigation levels. The experimental design used was in randomized blocks (DBC), with 4 treatments (irrigation levels) and 6 replications. Spacing of 1.0 m by 1.5 m was used, with 2 plants per plot, totaling 48 plants. The water was applied by micro-irrigation system, using self-compensating emitters with combined flow rates of 2.3; 3.3; 4.3 and 5.3 L h^-1. The irrigation management was carried out automatically by the Simplified Controller (SC) and the applied volume measured by daily readings on a hydrometer. During the experiment, the height of the plant, stem diameter, total number of leaves and the levels of chlorophyll (a, b and total) were evaluated every 15 days. Chlorophyll a fluorescence at 120, 238, 386 and 391 days after transplantation (DAT) were also evaluated. At 391 DAT, leaf area, fresh and dry shoot weight, dry root weight, and number, length and dry and fresh weight of ears at different maturation stages were measured. The data were subjected to analysis of variance, at a 5% significance level. In the cases of significance, the data were compared by regression analysis, at 5% probability by the F test. There was an increase in the values of all parameters with the increase in irrigation levels, with a variation of 40% in height, 55% in the number of leaves, 57% in the leaf area between the highest and the lowest irrigation level. Black pepper is considered sensitive to water stress with significance loss in the accumulation of fresh and dry mass. The photosynthetic efficiency and the concentration of chlorophyll pigments in plants were negatively affected by water stress and the number and weight of ears was reduced.

BANKING MEMBERS:
Presidente - 1224578 - DANIEL FONSECA DE CARVALHO
Externa ao Programa - 2353141 - LEONARDO DUARTE BATISTA DA SILVA
Externo à Instituição - ROBSON BONOMO - UFES