Optimized Nitrogen (N) management strategies are needed to maximize oat (Avena spp) production. In Mediterranean conditions, warm temperatures and water scarcity occurring during grain filling reduce photosynthesis rate, limiting the contribution of current assimilates to grain filling. In these conditions, remobilization of pre-anthesis reserves becomes particularly important and Nitrogen (N) grains of cereals is derived largely from remobilization from vegetative tissue. To determine whether genotypic differences in dry matter and nitrogen assimilation exist and are consistent across N fertilization, this study reports on comparisons of a diverse set of oat genotypes grown with different N rates in Central Italy. Field experiments were carried out in two consecutive years and in both years, experimental treatments consisted of five oat genotype and three N rates. The oat genotypes were: Avena sativa L., cv. Genziana (Bulban/Weibull 17578//Moore/Angelica, year of release 2002), Avena byzantina Koch, cv. Argentina (line no. 109 from an Argentinian population, year of release 1969), line 54 (Argentina/Genziana), dwarf line 27 (Argentina/Tropicale), and naked line (Penncomp40/Argentina/Argentina//Manoire). The N rates were: 0, 80 and 160 kg N ha-1. Plants were sampled at two harvesting stages: heading (Zadocks stage 59) and physiological maturity (Zadocks stage 92). The post-heading dry matter (DM) and N accumulation were calculated as the difference between DM and N content of the aerial plant part at physiological maturity and at heading. Then, remobilization on DM and N (DMR and NR) during grain filling were calculated as: - DMR = DM of the aerial plant part at heading - (DM of leaves + culms + chaff at maturity); - NR = N content of the aerial plant part at heading - (N content of leaves + culms + chaff at maturity). Oat species displayed different differences in remobilization and NHI values depending on N fertilization rate.
Accumulation and Remobilization of Dry Matter and Nitrogen in Oats As Affected By Genotype and Nitrogen Fertilization
Pampana S.
Primo
Writing – Original Draft Preparation
;Baldanzi M.Membro del Collaboration Group
;Arduini ISupervision
2023-01-01
Abstract
Optimized Nitrogen (N) management strategies are needed to maximize oat (Avena spp) production. In Mediterranean conditions, warm temperatures and water scarcity occurring during grain filling reduce photosynthesis rate, limiting the contribution of current assimilates to grain filling. In these conditions, remobilization of pre-anthesis reserves becomes particularly important and Nitrogen (N) grains of cereals is derived largely from remobilization from vegetative tissue. To determine whether genotypic differences in dry matter and nitrogen assimilation exist and are consistent across N fertilization, this study reports on comparisons of a diverse set of oat genotypes grown with different N rates in Central Italy. Field experiments were carried out in two consecutive years and in both years, experimental treatments consisted of five oat genotype and three N rates. The oat genotypes were: Avena sativa L., cv. Genziana (Bulban/Weibull 17578//Moore/Angelica, year of release 2002), Avena byzantina Koch, cv. Argentina (line no. 109 from an Argentinian population, year of release 1969), line 54 (Argentina/Genziana), dwarf line 27 (Argentina/Tropicale), and naked line (Penncomp40/Argentina/Argentina//Manoire). The N rates were: 0, 80 and 160 kg N ha-1. Plants were sampled at two harvesting stages: heading (Zadocks stage 59) and physiological maturity (Zadocks stage 92). The post-heading dry matter (DM) and N accumulation were calculated as the difference between DM and N content of the aerial plant part at physiological maturity and at heading. Then, remobilization on DM and N (DMR and NR) during grain filling were calculated as: - DMR = DM of the aerial plant part at heading - (DM of leaves + culms + chaff at maturity); - NR = N content of the aerial plant part at heading - (N content of leaves + culms + chaff at maturity). Oat species displayed different differences in remobilization and NHI values depending on N fertilization rate.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
