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| Author(s): |
Allan Charlles Mendes de Sousa
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: | 2016-02-26 |
| Examining board members: |
Zigomar Menezes de Souza;
Edson Eiji Matsura;
Miguel Cooper;
Marlene Cristina Alves;
Isabella Clerice de Maria
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| Advisor: | Zigomar Menezes de Souza |
| Abstract | |
The use of autopilot in agricultural vehicles and the adoption of combined double row spacing are possible solutions to mitigate the problems of soil compaction in sugarcane areas. The objective of this study was to evaluate the effects of autopilot and the use of combined double row spacing on the physical attributes of the soil in areas of sugarcane production. The experiment was undertaken in the city of Nova Europa ¿ SP, in two experimental areas of the Santa Fé mill, differentiated by their soil class within the property, one dystrophic Red Latosol and the other Quartzipsamment. The experiment followed the randomized block design (RBD), with four repetitions and three treatments: T1 = sugarcane planted with simple spacing (1.50 m), and managed without autopilot; T2 = sugarcane planted with simple spacing (1.50 m), and managed with autopilot; T3 = sugarcane planted with combined double row spacing (1.5 x 0.90 m), and managed with autopilot. The collection sites presented a difference in density only within the ratoon cycle. There was no difference among the treatments in carbon, humidity, clay content and particle aggregation. Treatments T2 and T3 presented lower soil resistance to penetration. Among the treatments used, there was no difference in the average size and forms of the pores in the two years of study. The second year of the study presented a reduction in big and complex pores in all of the treatments. There was an increase in the least limiting water range (LLWR) in treatments T2 and T3 in the second year of the study, especially in the crop row and in the seedbed. There was a reduction in T1¿s LLWR value from the first to the second year of harvest. The seedbed presented a larger load-carrying capacity when compared with the wheel rows in all treatments. The diameter, plant length, productivity, technological quality and root system variables presented no difference among the treatments. Among the collection sites, the wheel rows presented the shortest root length. All three treatments showed negative net present value and only T3 provided a positive internal rate of return (AU) | |
| FAPESP's process: | 12/21094-0 - Physical soil quality in sugar cane area with traffic control |
| Grantee: | Allan Charlles Mendes de Sousa |
| Support Opportunities: | Scholarships in Brazil - Doctorate |