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| Author(s): |
Ivo Zution Gonçalves
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | Campinas, SP. |
| Institution: | Universidade Estadual de Campinas (UNICAMP). Faculdade de Engenharia Agrícola |
| Defense date: | 2015-08-05 |
| Examining board members: |
Edson Eiji Matsura;
Rubens Duarte Coelho;
Regina Celia de Matos Pires;
Fernando César Bachiega Zambrosi;
Roberto Testezlaf
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| Advisor: | Edson Eiji Matsura |
| Abstract | |
The increase in the production of sugarcane is directly influenced by the increase in demand for ethanol, sugar and biofuel, and has been driven by population growth, resulting in the expansion of cultivated areas to regions where there are low volumes precipitated and even shortages of water sources for irrigation practice, thus negatively affecting crop productivity. Thus, the use of alternative sources for irrigation is essential to avoid yield loss due to this limitation. The treated sewage is shown as a potential water resource, can be used in sugarcane by irrigation, it is source of nutrients and water to the culture, and its use to reduce the negative environmental impacts generated by its launch water resources, and still keep the surface water and groundwater for human and animal consumption. Thus, the objective of this research was to evaluate the vegetative growth, the yield, the physiological, the technological aspects of raw material and soil fertility during the first and second ratoon via subsurface drip irrigated installed at different depths, with application of treated domestic sewage. An experiment was conducted in randomized blocks with 5 treatments: no irrigation (SI), irrigation with sewage applied to 0.20 m depth in the soil profile (E20), sewage 0.40 m (E40), irrigation with surface water reservoir to 0.20 m in the soil profile (A20) and water reservoir to 0.40 m (A40). All irrigated treatments received fertigation based on absorption of nutrients of the culture, supplementing the water quality used, while no irrigation received conventional fertilization. For each treatment was evaluated the vegetative growth, gas exchange, chlorophyll a and b, leaf water potential, nutritional diagnosis of leaves and stems, productivity, nutrient export by stems, technological quality analysis of stems and soil fertility in sugarcane from the first and second ratoon. The irrigated treatments showed higher vegetative growth and productivity in both ratoons, influenced by higher gas exchange, leaf water potential and soil moisture. By reason of the increased productivity of stalks, a greater nutrient uptake by irrigated plots above the supply of nutrients to the soil, resulting in reduction of soil fertility in the years of cultivation. In general, the technological quality of stems was adequate for all the treatments and higher in the second ratoon. The depth of drip tape installation and quality of applied water influenced the sodium concentrations in the soil profile. The treatments irrigated with sewage also showed in both ratoons, significant economies in mineral fertilizers. The treated domestic sewage used did not show any negative result to the soil and the crop in relation to the evaluated parameters and can be used as an alternative for irrigation in the cultivation of sugarcane (AU) | |
| FAPESP's process: | 12/03588-6 - Impact of the application of treated sewage via subsurface drip on the nutrition and physiology of culture sugar cane |
| Grantee: | Ivo Zution Gonçalves |
| Support Opportunities: | Scholarships in Brazil - Doctorate |