Attributes related to seasonal herbage growth in white clover
When breeding temperate forage species is investigated, some attributes such as herbage accumulation and seasonal growth patterns have to be considered. To modify some of these traits, knowledge of the detailed process might be useful. In order to evaluate seasonal growth of contrasting white clover populations an experiment was carried out. Treatments were five cultivars and three local populations collected in Argentina. Weekly measures were taken during each season to calculate leaf appearance and flower appearance rates, stolon growing rate and dry matter (DM) net accumulation. Different germplasm of this species have different mechanisms for DM accumulation. Leaf size, more than leaf appearance rate, was the variable with most differences among germplasm and mostly related to dry matter accumulation. During spring and summer, inflorescences production had important effects on growing stolon rate, and differences among germplasm were evident. Some local populations showed favourable attributes that could be useful for breeding.
Alternative Model for Path Analysis of Small‐Grain Yield
The model most widely used for path analysis of grain yield in small grains assumes bidirectional causal pathways between yield components; however, because yield components develop sequentially, it is questionable from a biological standpoint whether a yield component could influence others that develop earlier. The purpose of this research is to describe the theory and application of an alternative model for path analysis of grain yield that takes into account the sequential development of yield components(.)
Effect of Plant Growth Promoting Rhizobacteria (PGPR) on Reduction Nitrogen Fertilizer Application in Rapeseed (Brassica napus L.)
4 Abstract: In order to study the effect of Plant Growth Promoting Rhizobacteria (PGPR) on yield and yield components of rapeseed, a factorial experiment was conducted based on randomized completed block design with three replications in Ilam, Iran in 2011-2012 cropping season. The factors consisted of three levels of nitrogen fertilizer (100, 150 and 200 kg ha ) and bio-fertilizer (non-inoculation, Azotobacter Chroococcum and 1 Pseudomona Putid). The results showed that nitrogen rates had significant effects on yield and yield components. Significant increase was observed in all characters with applying bio-fertilizers and increasing nitrogen from 100 to 200 kg ha . The latter two treatments were in same statistical class in most characters. 1 Applying Azotobacter and Pseudomona increased yield and yield components by 15.8 and 13.7%, respectively compared with control treatment. There were significant interaction between nitrogen levels and bio-fertilizers regarding yield, yield components and seed oil and protein content. The highest amount of yield obtained from applying 200 kg ha with Azotobacter. Also, the highest seed oil and protein content was obtained by 1