Dry matter accumulation in genotypes of bean submitted to different levels of nitrogen

Abstract

The objective of this study was to verify the response of dry matter accumulation in bean lines (Phaseolus vulgaris L.) to different levels of nitrogen fertilizers. Six genotypes ('BRSMG Majestoso', 'Pérola', MA-I-18.13, 'Ouro Negro', 'BRSMG Talismã', and MA-I-2.5) were evaluated in Lavras, testing three N levels (0, 60, and 120 kg/ha) and using ammonium sulphate as N source. The experimental design adopted was the randomized block design in a 6 x 3 factorial structure with three replications and the plots were composed of five 5-m rows. The seeds were sown in November 2005 and July 2006. Total dry mass of five competitive plants was evaluated after 35 days from sowing, harvested from a pre-determined place in the useful area of the plots. This process was repeated every ten days until the harvest. The grain yield was also evaluated in one of the rows of the useful area of the plots. It was observed that regarding the dry mass accumulation, the genotypes did not present different responses at the N levels and the average increase per kg/ha applied N was 6.75 kg/ha grains. The genotype BRSMG Majestoso is the most responsive, with 14.4 kg/ha grains per kg applied N whereas the most tolerant is the MA-I-2.5 with1.8 kg/ha grains per kg N.

Seed Maturity and Its In Vitro Initiation of Chilean Endemic Geophyte Alstroemeriapelegrina L.

“…The high growth rate evidenced by dry matter accumulation confirms the sink strength of the fruits and seeds and emphasizes the plant's progression through its developmental stages [37,38]. Several authors have pointed out that the fruit, once dry, undergoes explosive loculicidal dehiscence, separating from the base with 3 valves and releasing the seeds and fruit debris to a considerable distance [6,9,11].…”

Acumulación De Materia Seca Durante Las Etapas De Desarrollo De Variedades De Frijol

“…; sin embargo, como el peso de la MS producido por una planta es el resultado de la fotosíntesis neta, el análisis del crecimiento a través de muestras secuenciales y acumulativas del peso seco describe el crecimiento de una planta a través de sus etapas de desarrollo. El análisis de crecimiento ha mostrado ser útil para describir la plasticidad de un cultivar, su respuesta a la aplicación de insumos y a cambios ambientales, así como para determinar diferencias entre cultivares (Araújo et al, 2009;White e Izquierdo, 1991).…”