In chapter 1 we will study soil organic matter, its role in conservation farming and practical applications. In chapter 2, we will address the theme fertilization systems, a subject little discussed today, even with so much progress in the paradigm shift from conventional management to conservationist management. Chapter 3 discusses the role of soil microbiota in conservationist management of soil fertility. Finally, chapter 4 discusses the importance of the watershed. All the content discussed is the result of class notes from the Master's Degree in Conservation Agriculture, academic papers...

A 110VAC voltage with a frequency of 60Hz is generated from a push-pull converter and a full-bridge inverter in a pseudo sine wave with a power of 600W. For this, a 12VDC battery is used as power source. For the circuit to work properly, a current limiter, a voltage level sensor besides a protection system against high temperatures and input under-voltage was added to the control.Keywords: converter, inverter, push-pull, full-bridge, control.

The present dissertation aimed to evaluate the influence of climate variability and water availability on soybean productivity in western Paraná. Historical series of precipitation from the Water Institute of Paraná of ten municipalities in the region were studied, with daily data from 1977 to 2015. The effects of the ENOS phenomenon during its El Niño and La Niña phases on the interannual variation of rainfall, and the LTO on the decadal cycles of precipitation in the region were analyzed. The analysis of microclimate and soybean productivity was performed in the municipality of Guaíra,...