Effect of Split Nitrogen Application on Growth and Yield of Wheat (T. aestivum L.) Genotypes with Different N‐Assimilation Potential

Abstract

A field experiment was conducted with different nitrogen regimes to assess the growth and yield performance of wheat genotypes which differ in nitrate assimilation potential. Genotypic differences in biomass accumulation were observed at different growth stages. The nitrogen treatment had little effect on biomass accumulation at early stages of growth, while at later stages of growth there was enhanced biomass accumulation when N was applied in more than two splits. On an average, genotypes with high nitrate reductase activity (the ‘HNR’ genotypes) accumulated 14.2 % more biomass than the genotypes with low nitrate reductase activity (‘LNR’ genotypes) when an extra dose (40 kg N ha−1) of nitrogen was given at the time of anthesis. The application of nitrogen in more than two splits increased grain yield of both ‘HNR’ and ‘LNR’ genotypes mainly by increasing grain weight per ear. The application of an extra dose of nitrogen (40 kg N ha−1) at the time of anthesis increased grain yield of ‘HNR’ genotypes by 38.5 % as compared to ‘LNR’ genotypes.

Effect of nitrogen application timings and varieties on growth and yield of wheat grown on raised beds

“…The higher dry matter accumulation in response to the split application of N might be due to the availability of N to the plant for a longer period and the continued synthesis of photosynthates thus resulted in increased dry matter accumulation. The present findings also corroborate the earlier results obtained by Singh (1996) who observed that the application of N in three splits produced a higher number of tillers than tillers produced by a single application of N. Abdin et al (1996) reported that the N treatment had little effect Archives of Agronomy and Soil Science 215 on biomass accumulation at early stages of growth, while at later stages of growth there was enhanced biomass accumulation when N was applied in more than two splits. Amongst the wheat varieties, PBW343 produced significantly higher dry matter than WH711 and WH283, but was statistically similar to WH542 and HD2687 at all the growth stages.…”

Realocação de nitrogênio e de biomassa para os grãos, em trigo submetido a inoculação de Azospirillum

“…A aplicação de N nos estádios iniciais de desenvolvimento (semeadura) estimula grandemente o aumento de afilhos, porém nem todos produzirão espigas (Abdin et al, 1996). O número de grãos por unidade de área é uma medida que integra os efeitos do afilhamento, da sobrevivência de afilhos, do nú-mero de espiguetas e do número de grãos por espiguetas, e as compensações que ocorrem entre esses componentes dependem basicamente de condições ambientes (Midmore et al, 1984).…”

Seasonal Biomass Accumulation and Nutrient Uptake of Canola, Mustard, and Flax on a Black Chernozem Soil in Saskatchewan

“…Similarly, seed yield and yield components (bolls and seeds plant −1 , seed weight) as well as harvest index of flax grown in central Italy were significantly influenced by weather in different years (Casa et al, 1999). For synchronizing fertilizer amounts and nutrient supply schedule with nutrient demand of crops information on temporal patterns of nutrient uptake by crops during the growing season was needed (Rhoads and Stanley, 1981;Abdin et al, 1996). Downloaded by [University of California Santa Cruz] at 06:33 27 November 2014 Canola, flax, and mustard are important oilseed crops in the Parkland region of western Canada.…”