Banca de DEFESA: JANE ANDREON VENTORIM

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : JANE ANDREON VENTORIM
DATA : 27/02/2018
HORA: 13:00
LOCAL: Sala Hilton Sales
TÍTULO:

Development and Evaluation of a Low Cost Prototype for Detection of Water Stress in Eggplant

PALAVRAS-CHAVES:

water deficit, leaf temperature, crop water stress index (CWSI), vapor pressure déficit , water stress index.

PÁGINAS: 44
GRANDE ÁREA: Ciências Agrárias
ÁREA: Engenharia Agrícola
SUBÁREA: Engenharia de Água e Solo
ESPECIALIDADE: Irrigação e Drenagem
RESUMO:

The indicators of the water status of the plants can be used in several situations. However, most of these indicators are determined by the use of expensive equipment, often through time-consuming techniques. Thus, the use of infrared thermometry presents itself as a great alternative, being of low cost and high practicality in the determination of water stress in plants. The objective of this work was to evaluate if the estimated CWSI, calculated through the vapor pressure deficit (DPV), the leaf temperature and the air temperature, can be used as an indicator of water stress for the eggplant crop and to evaluate if there is a need to calculate the measured CWSI from the wet leaf temperature, comparing with the estimated CWSI and to verify if there is a relation between the estimated CWSI, the water potential and the soil moisture. The experiment was conducted in a greenhouse at the Centro Estadual de Pesquisa em Agricultura Orgânica (PESAGRO) located in the municipality of Seropédica - RJ. The culture was planted with eggplant (Solanum melongena L.), cultivar Nápoli, cultivated in 18 L pots, filled with a mixture of sandy clay loam soil and 20% commercial substrate, spaced 0.70 mx 1.0 m , arranged in 6 rows and with 7 pots each. The irrigation system used was located by drip irrigation. The plants were randomly assigned to two treatments. T1 and T2. Where T1 represents the plants that were maintained near the field capacity and T2 representing the plants that underwent water stress. The plants were submitted to seven cycles of stress, lasting between two and three days, varying according to the climatic conditions. All plants were kept close to field capacity, starting the cycle. Soon irrigation was suspended in T2, and T1 was always kept close to field capacity. After T2 suffered the water deficit irrigation was resumed in all plants for at least two days before starting a new cycle.

In order to establish an estimated CWSI correlation, the variables soil moisture and leaf water potential were evaluated. Plant growth traits were also evaluated: height, stem diameter, leaf leaf vein growth and leaf length and root dry weight. It was possible to verify that there is a satisfactory adjustment between the (Tw - Tar) interval with the DPV, which means that there is no need to measure the wet sheet temperature (Tw) of the sheet when it is possible to calculate DPV, (Tar) and relative humidity (RH). The relationship between CWSIest and CWSImed obtained performance from the pet model rated "Very Good". Thus, the CWSIest, using data from the prototype at a low cost, can be used as an indicator of water stress for the eggplant crop. A positive correlation was found between the CWSIest and the water potential and between CWSIest and soil moisture, concluding that it is feasible to use the prototype to detect the water deficit in the eggplant.

MEMBROS DA BANCA:
Interno - 2353141 - LEONARDO DUARTE BATISTA DA SILVA
Externo ao Programa - 1736993 - SILVIA APARECIDA MARTIM
Externo à Instituição - ELIEMAR CAMPOSTRINI - UENF