'Adhesion Flow' and Regressive Gully-Head Expansion in Southern Brazil: Field Experiment Results

2013 ◽  
Author(s):  
Marcelo Accioly Teixeira de Oliveira
Author(s):  
Armando Androcioli Filho ◽  
Paulo Henrique Caramori

Frost damages in a field experiment of pruning types and systems for the cultivars of Coffea arabica Catuaí and Mundo Novo, were evaluated at Londrina (23º22’S, 52º10´W), State of Parana, southern Brazil, during the winter of 1990 and 1994. Pruning types evaluated were ‘esqueletamento’ (cutting off all plagiotropic branches at 20-30 cm from the orthotropic branch), ‘decote’ (cutting off the orthotropic branch at 1.5 m and 2.0 m above ground) and ‘recepa’ (cutting off the orthotropic branch at 0.8 m above ground), performed on all rows and on alternate rows, and on different sections of the plant. Results indicated that frost damage could increase according to the type and height of pruning. The pruning type ‘esqueletamento’ and prunings at higher levels were more suitable for regions with frost risk. Under severe frost condition, pruning type did not affect the damage in anyone of the treatments evaluated.


2010 ◽  
Vol 45 (12) ◽  
pp. 1456-1464 ◽  
Author(s):  
Nivea Maria Piccolomini Dias ◽  
Eduardo Fávero Caires ◽  
Luiz Fernando Pires ◽  
Márcio Arruda Bacchi ◽  
Elisabete Aparecida de Nadai Fernandes

The objective of this work was to determine the impact of phosphogypsum application on 226Ra and 228Ra activities in the soil and on their accumulation in soybean grains. A field experiment was carried out in Paraná state, Brazil, on a loamy Typic Hapludox, under no-till system, with increasing phosphogypsum rates: 4, 8, and 12 Mg ha-1. GammA ray spectrometry was carried out using HPGe detectors with 45 and 10% relative efficiencies, for soybean grains and soil, respectively. No increment of 226Ra and 228Ra activities was observed due to the increase in phosphogypsum rates in the soil, and a small reduction was noticed in the grains. Average values found for 226Ra and 228Ra activities were 37 and 57 Bq kg-1 in the soil and 1.44 and 3.19 Bq kg-1 in soybean grains. The application of phosphogypsum for no-till soybean production is a safe practice regarding the risks of radiation damage to human health


Author(s):  
Carlos Zubaran ◽  
Katia Foresti ◽  
Marina Verdi Schumacher ◽  
Aline Luz Amoretti ◽  
Lucia Cristina Muller ◽  
...  

2010 ◽  
Author(s):  
Julia Levashina ◽  
Frederick P. Morgeson ◽  
Michael A. Campion

2012 ◽  
Author(s):  
Svin Deneckere ◽  
Martin Euwema ◽  
Cathy Lodewijckx ◽  
Massimiliano Panella ◽  
Walter Sermeus ◽  
...  

Author(s):  
Jennifer S. Lerner ◽  
Roxana M. Gonzalez ◽  
Deborah A. Small ◽  
Baruch Fischhoff

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