Banca de DEFESA: VANDEILSON BELFORT MOURA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : VANDEILSON BELFORT MOURA
DATA : 27/02/2019
HORA: 14:00
LOCAL: Laboratório de Agrometeorologia - UFRA
TÍTULO:

TIME DOMAIN REFLECTOMETRY, COWPEA EVAPOTRANSPIRATION AND SENSIBILITY FACTOR SUBMITTED TO DIFFERENT IRRIGATION BLADES IN NORTHEAST OF PARA.

PALAVRAS-CHAVES:

Sensitivity coefficient. Water deficit. Fall of productivity. Vigna unguiculata (L.) Walp. Water balance. Water in the soil

PÁGINAS: 100
GRANDE ÁREA: Ciências Agrárias
ÁREA: Agronomia
SUBÁREA: Agrometeorologia
RESUMO:

The analysis of productivity, effects and viability of irrigation and climatic conditions on cowpea in the Amazon are studies necessary to optimize production in the State of Pará, in order to know the impacts that the reduction of evapotranspiration (ET) understood by the transfer of water vapor into the atmosphere from both the soil surface and the transpiration of the plants can cause the growth and development of the crop. The estimation of ET by means of the water balance method requires knowledge of the variation of soil water storage in a given volume of soil that among the methods adopted in the monitoring is Time domain reflectometry (TDR). Considering the influence of soil physical and chemical variables on the process of water measurement by technology, the readings of the apparent dielectric constant of the soil (Ka) can lead to inadequate estimates of the volumetric moisture of the soil (θ) TDR technique in sub or overestimations. The objective of this study was to determine and evaluate calibration models for the estimation of water volumetric moisture in a Castanhal Yellow Latosol (PA) by Time Domain Reflectometry using undisturbed samples and by the gravimetric method with equation adjustment, as well as the comparison with calibration curves considered reference in the literature inserted and recommended in soil moisture sensors. After calibration and adjustment of the data, the objective was to estimate the evapotranspiration of the crop (ETc), real (ETr) and to evaluate the cultivation of the cowpea submitted to different irrigation slides and their effects in the phenological stages on the response factor of the (Ky) and dry biomass (Kss) in the edaphoclimatic conditions of the Northeast of paraense by the water balance method. The linear and cubic polynomial adjustments showed the best estimates of θ estimation performance in the studied soil from the values obtained by the gravimetric method, and the CS616 sensor manufacturer's equations were inadequate, as they underestimated the Ka values. All the models of the literature presented overestimations of the values of θ, from the gravimetric values. The ETc and ETr estimation of cowpea by the water balance method in the soil and climatic conditions of Castanhal, Pará, determined a total ET of cowpea of 337.5; 284.35; 258.62 and 219.82 mm with a mean consumption of 4.6, 3.90, 3.54 and 3.01 mm day -1 for T1, T2, T3 and T4. The grain yield declines were 18.91, 33.12 and 57.17% for T2, T3 and T4, respectively, with a significant difference in grain yield among all treatments by the tukey test at 5% probability. The flowering stage presented the highest water demand with 5.88 mm day -1 and the highest sensitivity to the water deficit quantified by the dry matter response factor (Kss). Both Ky and Kss showed an increase in the severity of the water restriction imposed by environmental conditions and treatments. Cowpea had a Ki of 1.48 and Kss of 2.03, 1.08 and 0.87 for the stages of flowering, grain filling and physiological maturation, indicating that the plant has a high sensitivity to the water deficit in the climatic conditions of the Northeast of Pará.

MEMBROS DA BANCA:
Externo à Instituição - ALAILSON VENCESLAU SANTIAGO - EMBRAPA
Externo à Instituição - HILDO GIUSEPPE GARCIA CALDAS NUNES - NENHUMA
Presidente - 1356961 - PAULO JORGE DE OLIVEIRA PONTE DE SOUZA
Externo ao Programa - 1521789 - RODRIGO OTAVIO RODRIGUES DE MELO SOUZA