RESUMO
O objetivo deste trabalho foi estudar os efeitos dos fatores externos no crescimento, desenvolvimento e na produtividade da planta de mamona. O experimento foi realizado com a cultivar 'BRS Energia' semeada em três épocas nas safras 2008/09 e 2009/10 em Pelotas - RS. As variáveis avaliadas foram a taxa de crescimento relativo (TCR), taxa assimilatória líquida (TAL), produtividade e as principais variáveis meteorológicas. A maior taxa de crescimento relativo e assimilatória líquida ocorre nos períodos de temperatura média de 22,5 a 25,7°C e insolação média diária maior que seis horas, que coincidem com as semeaduras de novembro e dezembro na região de Pelotas, enquanto as maiores produtividades ocorrem nas semeaduras de outubro e novembro.
The objective was to study external effects on growth, development and plant productivity. The experiment was conducted with 'BRS Energia' sown at three times in 2008/09 and 2009/10 seasons in Pelotas, Southern Brazil. It was evaluated the relative growth rate (RGR), net assimilation rate (NAR), yield and the main meteorological variables. The highest relative growth rate and net assimilation rate occurred at an average temperature of 22.5 to 25.7°C and average daily insolation greater than six hours, which coincide with November and December sowings in Southern Brazil. The highest yields were observed in October and November sowings.
RESUMO
The use of highly diluted and agitated solutions is widespread. Its use extends to all living beings including plants, acting effectively in the latter's primary and secondary metabolism. Aims: this is a pilot study designed to assess the action of Natrum muriaticum in dilutions 6 CH and 30 CH in comparison to the action of 5.0% NaCl solution administered separately to a population of Phaseolus vulgaris L. (common bean). Materials and methods: it was determined the relative growth rate (RGR) of the bean population treated for 6 weeks and subdivided into 4 groups (5 vases each): P1 (control) treated with 30% alcohol solution only; P2, treated with aqueous 5.0% NaCl solution; P3, treated with Nat-m 6 CH; P4, treated with Nat-m 30 CH. Results: it was seen an increase in the salinity of the soil that caused the inhibition of the development of the bean population P2. In addition, the use of Nat-m promoted a significant increase in vegetable growth, chiefly in dilution 6 CH (P3), causing a significant increase in the RGR of the bean population. Conclusion: high dilutions of Nat-m showed to be efficient to stimulate the growth of common bean.