Introduction Application of livestock manure provides nutrients for crop production and can also improve soil quality. However, the availability of nutrients in manure is difficult to predict. Therefore, livestock manure is frequently under or over-applied with respect to crop nitrogen and phosphorus requirements. In cases where the availability of nutrients is less than expected, application r...

Mechanistic crop growth models are becoming increasingly important in agricultural research and are extensively used in climate change impact assessments. In such studies, statistics of crop yields are usually evaluated without the explicit consideration of sample size requirements. The purpose of this paper was to identify minimum sample sizes for the estimation of average, standard deviation ...

Scientific investigations about crop water requirements are of fundamental importance to the irrigation process. The main objective of this paper is to analyze and to map water requirements of coffee crop in Minas Gerais State, Brazil. Potential evapotranspiration values (ET0) were estimated by the Penman-Monteith-FAO method, using daily data sets available for 42 National Meteorology Institute...

Soybean event DAS-444Ø6-6 is tolerant to the herbicides 2,4-D, glyphosate, and glufosinate. An investigation of potential unintended adverse compositional changes in a genetically modified crop is required to meet government regulatory requirements in various geographies. A study to meet these requirements in Brazil was completed demonstrating compositional equivalency between DAS-444Ø6-6 and n...

Rainfall expected to occur in a given period is defined as dependable rainfall. The increasing pressure on freshwater resources necessitates efficient water use the agricultural sector, where used most globally. Therefore, rainfall values dry (80%), normal (50%) and wet (20%) periods, which are planning operation stages of irrigation networks, can be determined by analysis. In this study, chang...