N-use efficiency of single, double and synthetic maize lines grown at four N levels in three ecological zones of West Africa

Akintoye, H. A.; Kling, J. G.; Lucas, E. O.

doi:10.1016/s0378-4290(98)00122-1

Cited by 44 publications

(46 citation statements)

References 13 publications

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“…However, in the low N, the NUE of P 3041 was not different from the hybrid combinations with averages of more than 254 kg kg -1 (Table 2). In experiments with maize hybrid in low and high N, Akintoye et al (1999) found NUE of 55 and 25 kg kg -1 (kg of grain per kg of N applied), respectively. These authors used the average of four N levels and three sites, and found an average NUE that varied from 39.8 to 30.4 kg kg -1 .…”

Section: Resultsmentioning

confidence: 95%

Genetic control of grain yield and nitrogen use efficiency in tropical maize

Souza

Miranda

Galvão

et al. 2008

Pesq. agropec. bras.

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-The objectives of this work were to study the genetic control of grain yield (GY) and nitrogen (N) use efficiency (NUE, grain yield/N applied) and its primary components, N uptake efficiency (NUpE, N uptake/N applied) and N utilization efficiency (NUtE, grain yield/N uptake), in maize grown in environments with high and low N availability. Experiments with 31 maize genotypes (28 hybrid crosses and three controls) were carried out in soils with high and low N rates, in the southeast of the state of Minas Gerais, Brazil. There was a reduction of 23.2% in average GY for maize grown in soil with low N, in comparison to that obtained with high N. There were 26.5, 199 and 400% increases in NUtE, NUpE, and NUE, respectively, for maize grown with low N. The general combining ability (GCA) and specific combining ability (SCA) were significant for GY, NUE and NUpE for maize grown in high N soil. Only GCA was significant for NUpE for maize grown in low N soil. The GCA and SCA for NUtE were not significant in either environment. Additive and non-additive genetic effects are responsible for the genetic control of NUE and GY for maize grown in soils with high N availability, although additive effects are more important. Index terms: Zea mays, abiotic stress, absorption efficiency, combining ability, commercial hybrids, utilization efficiency. Controle genético da produção de grão e da eficiência de uso do nitrogênio em milho tropicalResumo -O objetivo deste trabalho foi estudar o controle genético da produtividade de grãos (PG) e da eficiência no uso de nitrogênio (EUN, produção de grãos/N aplicado) e seus componentes primários -eficiência de absorção (EAbN, N absorvido/N aplicado) e utilização (EUtN, produção de grãos/N absorvido) -, em milho cultivado em ambientes com alta e baixa disponibilidade de nitrogênio. Trinta e um genótipos de milho (28 cruzamentos entre híbridos comerciais e três testemunhas) foram avaliados em solos com alta e baixa doses de aplicação de N. Houve redução de 23,2% na média de PG em milho cultivado em solo com baixo teor de N, em relação à obtida com alto N.

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Section: Resultsmentioning

confidence: 95%

Genetic control of grain yield and nitrogen use efficiency in tropical maize

Souza

Miranda

Galvão

et al. 2008

Pesq. agropec. bras.

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“…Some researchers (Balko & Russel, 1980;Muruli & Paulsen, 1981;Presterl et af., 2002;Laffite & Edmeades, 1994a;Banziger et ai., 1997) reported that sufficient genetic variability exists to select or breed maize genotypes that can perform well on soils with low N supplying capacities. Other researchers (Kamprath, Moll & Rodriquez, 1982;Moll, Kamprath & Jackson, 1982;Akintoye, Kling & Lucas, 1999;Wiesler, Behrens & Horst, 2001) reported that genotypes that are superior in the utilization of available nitrogen, either due to an enhanced uptake capacity or because of more efficient use of the absorbed nitrogen in grain yield, could reduce the impact of nitrogen deficiency on maize production.…”

Section: Introductionmentioning

confidence: 99%

Comparison of maize genotypes for grain yield, nitrogen uptake and use efficiency in Western Ethiopia

Tolessa

Preez

Ceronio

2007

South African Journal of Plant and Soil

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Nitrogen is the most limiting nutrient in the production of maize in western Ethiopia with its favourable climate for this crop. This is because Nitisols inherently low in N are used for maize production by resource-poor farmers who cannot afford fertilizer application. ,An option in combating this constraint is planting of maize genotypes that are efficient in N use. Experiments were therefore conducted to evaluate different maize genotypes for grain yield, N uptake and use efficiency at five sites. At each site two experiments, viz. one with open-pollinated genotypes and the other with hybrid genotypes were laid out in a randomized complete block design with three replications. In each of these experiments either five open-pollinated genotypes or five hybrid genotypes were combined in complete factorial arrangement with six N fertilization levels ranging from 0 to 230 kg ha-1 at 46 kg intervals. The results indicated that only two genotypes qualified as N use efficient, viz. the open-pollinated Ecaval 1 and the hybrid CML373/CML202/CML384. On average they outyielded their respective local genotypes by 5.9% at a low N application and by 17.5% at a high N application. Both genotypes also showed consistently higher N agronomic efficiency, N recovery efficiency and N physiological efficiency at low and high N applications. The introduction of these two N use efficient genotypes into the farming systems of the resourcepoor farmers could be beneficial to them.

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“…This can result in higher N losses. The higher rate of N fertilizer led to low recovery of N due to losses through denitrification, ammonia volatilization, run off, leaching, and inefficient utilization by crops was reported as important constraints to N fertilizer use among farmers in the sub-region (Akintoye et al, 1999). Based on the effects of N rate × irrigation interactions on N losses, it can be concluded that an increase in irrigation amount at low levels of N rates led to no influence in N losses whereas, more N losses was found at high levels of N rates in the same conditions (Figure 3).…”

Section: N Lossesmentioning

confidence: 99%

“…Maximum values of NUE were acquired by application of lower N fertilizer and the minimum values were observed at higher levels of N rates at over levels of plant densities (Figure 4). Because further increases in yield diminishes along with further increases in the amount of applied N fertilizer , that is, the efficiency of N utilization decreases as yield increases (Akintoye et al, 1999). It is well known that NUE decreases with increment of N availability (Chamoro et al, 2002;Svecnjak and Rengel, 2006).…”

Section: Nitrogen Use Efficiency (Nue)mentioning

confidence: 99%