Banca de DEFESA: JOAO VITOR DE NOVOA PINTO
Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.STUDENT : JOAO VITOR DE NOVOA PINTO
DATE: 30/09/2022
TIME: 09:00
LOCAL: laboratorio de agrometeorologia (defesa virtual)
TITLE:
CHARACTERISTICS OF PRODUCTION OF IRRIGATED “TAHITI” ACID LIME IN THE CLIMATE CONDITIONS OF EASTERN AMAZON
KEY WORDS:
Irrigated citrus, Yield, evapotranspiration, efficient water use
PAGES: 71
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Agrometeorologia
SUMMARY:
Brazil is the fifth largest producer of “Tahiti” lime in the world. Among the existing citrus species, this is the one with the second largest cultivated area in the country, behind orange. In the state of Pará, citriculture has been growing in recent years, and the acid lime “Tahiti” already occupies 25% of the area cultivated with citrus in the state. In this region, flowering occurs at the end of June and the fruit development period extends until mid-November. The harvest is concentrated between December and April, period in which the Tahiti lime reaches the lowest price in the regional market. In this study, the response of irrigated Tahiti lime to four different irrigation depths was evaluated in a randomized block experiment under the edaphoclimatic conditions of the eastern portion of the Amazon. The treatments, which consist of the four irrigation depths, were named T1, T2, T3 and T4. Irrigation was performed in order to maintain the soil water potential, monitored by tensiometers, within the following ranges: below -50 kPa for T1, between -30 and -50 kPa for T2, between -10 and -30 kPa for T3, and above -10 kPa for T4. The crop response was analyzed through observations of the following variables: occurrence of flowers and fruits, productivity, and gas exchange. The results indicate that irrigation lead to anticipation of the beginning of the harvest period and an increase in the total productivity accumulated in the 2020-2021 harvest until February, which increased from 2.22 in T1 to 6.89 kg plant‑1 in T4. In the following months, the productivity of the treatments was equal, stabilizing between 6.01 and 8.95 kg plant‑1. Water stress induced a second flowering in mid-October in plants that received the lowest irrigation depth, which prolonged the period of fruit harvest in this treatment. The different irrigation depths also influenced the fresh weight of the harvested fruits, which was higher in the treatment with the highest irrigation depth. In addition, the economic efficiency and water productivity of the crop were evaluated. In the analysis of economic efficiency, the gross revenue and the net revenue of the crop were evaluated. Under the conditions of the study, there was no economic viability in any of the blades tested, due to the low productivity obtained. Regarding water use, it was found that increasing the irrigation depth reduced the ratio between the gross revenue obtained and the volume of water supplied (with irrigation), and there was a reduction in the ratio between the productivity obtained and the water supplied. The radiation balance was also measured throughout the experiment. It was observed that the albedo of the culture was 0.13 and the mean evapotranspiration during the two years of the experiment was 3.2 mm day‑1
BANKING MEMBERS:
Presidente - 1356961 - PAULO JORGE DE OLIVEIRA PONTE DE SOUZA
Interna - 2494920 - ANTONIA BENEDITA DA SILVA BRONZE
Externo à Instituição - ANTONIO HÉLDER RODRIGUES SAMPAIO - IFBaiano
Externo à Instituição - GLAUCO DE SOUZA ROLIM - UNESP
Externa à Instituição - LUCIETA GUERREIRO MARTORANO - EMBRAPA