Banca de DEFESA: DEIVISON RODRIGUES DA SILVA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : DEIVISON RODRIGUES DA SILVA
DATE: 23/10/2020
TIME: 09:00
LOCAL: Na sala do Google Meet
TITLE:

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KEY WORDS:

Agro-industrial waste, fertility, soil conditioner.

PAGES: 53
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Ciência do Solo
SPECIALTY: Manejo e Conservação do Solo
SUMMARY:

Palm oil ash (POA) is an agro-industrial waste resulting from the incineration of plant residues in the oil extraction process, the improper disposal of which can cause environmental damage, such as soil, water and air pollution. The rational use of these ashes can improve soil conditioning, without causing environmental damage. Therefore, there is a need to characterize and define the quantities that can be used to improve soil fertility and increase agricultural productivity, without the risk of contamination by potentially toxic elements. The characteristics of two CPO (C1 - produced from the combustion of fibers at temperatures of 400 to 500 ºC, and C2 - produced from the combustion of fibers and almond skins at temperatures from 800 to 1000 ºC) and the effect of doses (1, 3 and 5%) in soil fertility and lettuce (Lactuca sativa L.) growth. The pH and electrical conductivity were similar between C1 and C2, while C1 had a higher cation exchange capacity (CTC) and C2 a higher particle density. The PCZ of the two ashes were 7.3 and 7.8 for C1 and C2, respectively. The scanning electron microscopy (SEM) analysis showed a porous structure, with irregular grains and cellular textures. High total levels of phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg), manganese (Mn), molybdenum (Mo), copper (Cu), zinc (Zn) and boron (B) were found in both CPOs, with emphasis on P, with C2 being richer in nutrients. Some trace elements were also found, being titanium (Ti), strontium (Sr), chromium (Cr) and rubidium (Rb) in greater quantities. The fractionation of P present in the ash showed considerable amounts in the soluble, labile and mineral-associated form. Both ashes showed the neutralization power of the exchangeable Al, increased the pH and reduced the potential acidity. There was an increase in inorganic and organic carbon and C1 increased the CTC of the soil. The CPOs increased the concentration of P, K, Ca and Mg in the soil. The fractionation of P showed an increase in soluble P and P associated with minerals in the soil. Fe, Mo, Hg and Pb values above the recommended soil quality reference values (VRQs) for the state of Pará were found and the application of 3% C1 and 3 and 5% C2 increased the Cr value, Cu, Mn and Ni for levels above the VRQ, but below the Prevention Values (VP). Both ashes improved the growth of the lettuce crop, with increments of height, diameter, number of leaves, leaf area and fresh and dry matter of the aerial part and roots with the application of up to 3%. The greatest responses were obtained with the application of C2 and the doses of maximum agronomic efficiency ranged from 3.3 to 4% for C1 and 3.6 to 5.1% for C2.

BANKING MEMBERS:
Presidente - 6388356 - ANTONIO RODRIGUES FERNANDES
Externa à Instituição - EDNA SANTOS DE SOUZA - UNIFESSPA
Externo ao Programa - 140.391.332-34 - JESSIVALDO RODRIGUES GALVAO - UFRA
Interno - 030.493.086-56 - SILVIO JUNIO RAMOS - ITV