Nitrogen Use by Yam as Affected by Mineral Fertilizer Application

Hgaza, Valérie Kouamé; Diby, Lucien; Oberson, Astrid; Tschannen, A.; Tie, Bi Tra; Sangakkara, U. R.; Aké, S.; Frossard, Emmanuel

doi:10.2134/agronj2011.0387

Cited by 23 publications

(20 citation statements)

References 36 publications

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“…Equating N s to U 0 assumes that no interactions occur to increase or decrease N s when the plants are fertilized. However, there is evidence that N fertilization may affect the N cycle in ways that cause N s to differ from U 0 , indicating that N fertilization can stimulate N mineralization from organic matter (the priming effect) and reduce the quantity and rate of N immobilization by crop residues (Broadbent, 1965;Jenkinson et al, 1985;Green and Blackmer, 1995;Hgaza et al, 2012). Future recommendation systems might need to take these interactions into account.…”

Section: Fundamental Background Information About Nitrogenmentioning

confidence: 99%

Strengths and Limitations of Nitrogen Rate Recommendations for Corn and Opportunities for Improvement

et al. 2018

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A gronomy J our n al • Volume 110 , I ssue 1 • 2 018 1 T he goal of an N recommendation system is to accurately estimate the gap between the N provided by the soil and the N required by the plant. Accurately estimating this gap depends on the ability of the recommendation system to accurately estimate fi eld or subfi eld specifi c economically optimal nitrogen rates (EONR). Current recommendation systems are not as accurate as needed to provide consistently reliable estimates of N needs across years at the fi eld or subfi eld scale. Uncontrollable factors like temperature, rainfall timing, intensity and amount, and interactions of temperature and rainfall with factors such as N source, timing and placement, plant genetics, and soil characteristics combine to make N rate recommendations for an individual fi eld or rates for subfi elds a process guided as much by science as by the best professional judgement of farmers and farm advisors.Substantial evidence has accumulated that EONRs can vary widely across fi elds, within fi elds and over years in the same fi eld for a wide range of crops and geographies. Examples ABSTRACTNitrogen fi xation by the Haber-Bosch process has more than doubled the amount of fi xed N on Earth, signifi cantly infl uencing the global N cycle. Much of this fi xed N is made into N fertilizer that is used to produce nearly half of the world's food. Too much of the N fertilizer pollutes air and water when it is lost from agroecosystems through volatilization, denitrifi cation, leaching, and runoff . Most of the N fertilizer used in the United States is applied to corn (Zea mays L.), and the profi tability and environmental footprint of corn production is directly tied to N fertilizer applications. Accurately predicting the amount of N needed by corn, however, has proven to be challenging because of the eff ects of rainfall, temperature, and interactions with soil properties on the N cycle. For this reason, improving N recommendations is critical for profi table corn production and for reducing N losses to the environment. Th e objectives of this paper were to review current methods for estimating N needs of corn by: (i) reviewing fundamental background information about how N recommendations are created; (ii) evaluating the performance, strengths, and limitations of systems and tools used for making N fertilizer recommendations; (iii) discussing how adaptive management principles and methods can improve recommendations; and (iv) providing a framework for improving N fertilizer rate recommendations.

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Section: Fundamental Background Information About Nitrogenmentioning

confidence: 99%

Strengths and Limitations of Nitrogen Rate Recommendations for Corn and Opportunities for Improvement

et al. 2018

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“…Whether such an effect would also occur following organic fertilizer inputs should be assessed. In the same study, Hgaza et al ( 2012 ) observed a maximum N fertilizer recovery of below 30% in the tuber. This limited recovery was explained by the low planting density (one plant m −2 ), which is typical for West Africa and by the coarse and superficial root system of D. alata (Hgaza et al, 2011 ).…”

Section: Importance Of Soil Fertility For Yam Productionmentioning

confidence: 70%

“…Melteras et al ( 2008 ) observed radial of roots of D. esculenta that were longer than 3 m and suggested that this would lead to wrong interpretation of fertilizer trial results as an unfertilized plant would be able to take up nutrients from a fertilized plot. On the contrary, no N transfer was observed from fertilized to unfertilized plots in a study conducted with 15 N labeled fertilizer on D. alata with 1 m space between plots (Hgaza et al, 2012 ). Except in the work done by Kassi et al ( 2017 ), no relation linking soil properties and yam tuber yield has been published.…”

Section: Importance Of Soil Fertility For Yam Productionmentioning

confidence: 99%

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The Challenge of Improving Soil Fertility in Yam Cropping Systems of West Africa

Frossard

Aighewi²,

Aké

et al. 2017

Front. Plant Sci.

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Yam (Dioscorea spp.) is a tuber crop grown for food security, income generation, and traditional medicine. This crop has a high cultural value for some of the groups growing it. Most of the production comes from West Africa where the increased demand has been covered by enlarging cultivated surfaces while the mean yield remained around 10 t tuber ha−1. In West Africa, yam is traditionally cultivated without input as the first crop after a long-term fallow as it is considered to require a high soil fertility. African soils, however, are being more and more degraded. The aims of this review were to show the importance of soil fertility for yam, discuss barriers that might limit the adoption of integrated soil fertility management (ISFM) in yam-based systems in West Africa, present the concept of innovation platforms (IPs) as a tool to foster collaboration between actors for designing innovations in yam-based systems and provide recommendations for future research. This review shows that the development of sustainable, feasible, and acceptable soil management innovations for yam requires research to be conducted in interdisciplinary teams including natural and social sciences and in a transdisciplinary manner involving relevant actors from the problem definition, to the co-design of soil management innovations, the evaluation of research results, their communication and their implementation. Finally, this research should be conducted in diverse biophysical and socio-economic settings to develop generic rules on soil/plant relationships in yam as affected by soil management and on how to adjust the innovation supply to specific contexts.

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“…The NUE values found for the whole plant were low but within the broad range of values reported in the literature. Relatively low NUE values have been reported for a great variety of cropping systems worldwide, e.g., 14-20% for a maize crop in China [20], 22-33% for maize intercropped with trees in the humid tropics [21], 23% for water yam in Ivory Coast [22]. Indeed, a comparison between these results and ours is difficult because of the many different pedoclimatic conditions and fertilizing practices (rate, timing, and placement) involved in each specific study.…”

Section: Fate Of Fertilizer N In Plantsmentioning

confidence: 99%

Fate of a 15N-labeled Urea Pulse in Heavily Fertilized Banana Crops

et al. 2020

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Banana crops in the Caribbean are characterized by the use of high rates of nitrogen (N) fertilization which causes severe environmental damages. The aim of this study was to assess the fertilizer N use efficiency (NUE) of banana crops in the field. To do so, a field trial was carried out during the first (GS1) and the fourth (GS4) growing seasons of banana crops, and the fate of a 15N-labeled pulse applied late in the growing season (flowering stage) was determined. At harvest, NUE (average 24% 15N applied) and the total recovery of fertilizer 15N in the soil–plant system (i.e., 40% in GS1 and 62% in GS4) were low. Low NUE resulted mainly from the dilution in a large soil mineral N pool derived from earlier applications of the labeled-N fertilizer applied at flowering, combined with leaching caused by numerous high-intensity rainfall events (>20 mm d−1). Crop residues from previous cycles present at time of fertilizer application in the fourth growing season, promoted fertilizer N immobilization, which in turn favored fertilizer N recovery by decreasing N leaching. The results suggest that N fertilization after the first season could be reduced by 30% (i.e., −90 kg N ha−1) corresponding to the suppression of two applications from flowering to harvest with the current fertilizer management, as available N derived from earlier applications is sufficient to meet plant requirements.

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Nitrogen Use by Yam as Affected by Mineral Fertilizer Application

Cited by 23 publications

References 36 publications

Strengths and Limitations of Nitrogen Rate Recommendations for Corn and Opportunities for Improvement

Strengths and Limitations of Nitrogen Rate Recommendations for Corn and Opportunities for Improvement

The Challenge of Improving Soil Fertility in Yam Cropping Systems of West Africa

Fate of a 15N-labeled Urea Pulse in Heavily Fertilized Banana Crops

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