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| Author(s): |
João Paulo Francisco
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | Piracicaba. |
| Institution: | Universidade de São Paulo (USP). Escola Superior de Agricultura Luiz de Queiroz (ESALA/BC) |
| Defense date: | 2017-03-10 |
| Examining board members: |
Marcos Vinicius Folegatti;
Rubens Duarte Coelho;
Adriano Valentim Diotto;
Sergio Nascimento Duarte;
Leonardo Duarte Batista da Silva
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| Advisor: | Marcos Vinicius Folegatti |
| Abstract | |
Today the world is going through a phase of changing the energy matrix, where cleaner and renewable sources of energy are being used more and more. Considering the imminent scenario of scarcity of water resources, in addition to the need to produce cleaner energy, there is a need to rationalize the use of water and for this we must study the water consumption of crops. Thus, this project will aim to calibrate and use sap flow measurements obtained by the thermal dissipation probe to determine Jatropha curcas L. transpiration. For the calibration, jatropha plants grown under greenhouse conditions were used in 250 L vessels. These vessels were placed on weighing lysimeters and had their surface covered to avoid evaporation of soil water. The calibration was carried out during 60 consecutive days, which during the first 15 days the soil was maintained with humidity near the pot capacity by means of frequent irrigations, followed by 30 days of soil moisture reduction due to suppression of irrigation and of 15 days with the return of irrigation to the recovery of plant hydration. The transpiration was determined in the lysimeters and these data were used to calibrate the measurements obtained by sap flow sensors inserted in the trunk of the plants. After the calibration, the sensors were installed in the field to monitor the transpiration of plants cultivated under central pivot irrigation, drip irrigation and without irrigation. Allied to the different types of pruning to which the plants were submitted, the combination of the water consumption of the jatropha plants associated to these pruning treatments was evaluated. As expected, the thermal dissipation method proved to be reliable for the determination of perspiration of Jatropha, allowing the methodology to be used in the field. It was verified a significant effect of irrigation, pruning types and evaluation period after pruning for plant height, canopy diameter and volume and LAI. ETc values of 6.96; 7.54 and 6.57 mm day-1 for the treatments of localized irrigation, central pivot and without irrigation, respectively. (AU) | |
| FAPESP's process: | 13/25686-2 - Estimation of transpiration of physic nut using the method of thermal dissipation |
| Grantee: | João Paulo Francisco |
| Support Opportunities: | Scholarships in Brazil - Doctorate |