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Plénet, Daniel; Lemaire, G.

doi:10.1023/a:1004783431055

Cited by 368 publications

(93 citation statements)

References 34 publications

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“…2). Both Plénet and Lemaire (1999) and Ziadi et al (2007) reported, in general, that neither N nor P deficiencies severely reduced maize BM and P concentration compared with optimum N or P. Ranges in plant P and/or K dilution in our research were similar to those Table 1. Leaf and stem P, K, and S contents for different vegetative growth stages (V5, V10, V15, and R1 stages) for maize grown at three plant densities and three N rates (0, 112, and 224 kg N ha -1 ) across two hybrids, sites, and growing seasons.…”

Section: Nutrient Content Evolution: Phosphorus Potassium and Sulfursupporting

confidence: 84%

Maize Nutrient Accumulation and Partitioning in Response to Plant Density and Nitrogen Rate: I. Macronutrients

et al. 2013

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Understanding nutrient balances in changing cropping systems is critical to appropriately adjust agronomic recommendations and inform breeding efforts to increase nutrient efficiencies. Research to determine the season‐long P, K, and S uptake and partitioning dynamics in maize (Zea mays L.) as affected by low, medium, and high plant density (PD) and N rate factors and their interactions was conducted over four site‐years in Indiana. Plant nutrient contents at maturity responded predominantly to N rate. Relative nutrient contents at silking compared with those at maturity were 47% for P, 100% for K, and 58% for S. Concentrations of P, K, and S varied less in leaf vs. stem (vegetative stage) and in ear vs. shoot (reproductive stage). Equivalent stoichiometric ratios were documented for N and S partitioning in leaf, stem, and ear components. The PD and N rate treatments did not modify P, K, and S nutrient partitioning to plant components during vegetative or reproductive periods (except for an N rate effect on leaf vs. stem P partitioning). Near silking, relative nutrient partitioning to the ear followed the order P > S > K. This mimicked the nutrient harvest indices observed at maturity, suggesting genetic modulation. Ratios of N to P, K, and S in whole‐plant tissues were influenced by N content changes in response to N rate but not by PD. As the season progressed, PD and N rates changed the absolute P, K, and S quantities (primarily reflecting biomass responses) but had little influence on nutrient ratios.

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Section: Nutrient Content Evolution: Phosphorus Potassium and Sulfursupporting

confidence: 84%

Maize Nutrient Accumulation and Partitioning in Response to Plant Density and Nitrogen Rate: I. Macronutrients

et al. 2013

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“…In corn and potatoes, the approach of critical N at the early growth stage does not provide a reliable estimate crop N status [61] and this could be due to the competition between plants [62]. The concentration of N decreases with increase in crop biomass, sometimes referred to as "dilution" [62].…”

Section: Use Of Tissue Analysis For N Managementmentioning

confidence: 99%

“…The concentration of N decreases with increase in crop biomass, sometimes referred to as "dilution" [62]. The critical N dilution curve range for corn could be used up to the silage maturity [63].…”

Section: Use Of Tissue Analysis For N Managementmentioning

confidence: 99%

A Review of Methods to Improve Nitrogen Use Efficiency in Agriculture

2017

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Management of nitrogen (N) is a challenging task and several methods individually and in combination are in use to manage its efficiency. However, nitrogen use efficiency (NUE) has not been improved to a level, only 33%, as predicted by the researchers while developing nitrogen management tools and methods. The primary objective of this review article is to evaluate methods and tools available to manage nitrogen. Several methods, soil testing, plant tissue testing, spectral response, fertilizer placement and timing and vegetative indexes (leaf area index, and NDVI) through drones, handheld sensors, and satellite imagery were reviewed on the subject of user-friendly and effectiveness towards NUE. No single method was found sufficient to counter the nitrogen loss. Some methods were found time consuming and unsynchronized with N uptake behavior of particular crop, for example, plant tissue testing. Use of precision agriculture tools, such as GreenSeeker, Holland Crop Circle, drone, and satellite imagery, were found better compared to conventional methods such as soil testing, but these tools can only be used when the crop is up. Therefore, N management is possible only through inseason N application methods. When 70% of the applied nitrogen is used by the crops within 25-30 days after planting, for example, corn and potatoes, it is required to apply major N rates through inseason approach and some N at planting using soil test reports. In conclusion, this article strongly advocates using two or more methods in combination when managing N.

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“…the right time (Plénet and Lemaire, 1999). This can best be steered by the application of easily soluble mineral fertilizer.…”

Section: Effect Of Fertilizer Treatments On Yield Performance Of the mentioning

confidence: 99%

Fertilizing Potential of Separated Biogas Digestates in Annual and Perennial Biomass Production Systems

Ehmann

Thumm

Lewandowski

2018

Front. Sustain. Food Syst.

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Digestates produced by the increasing number of biogas plants require appropriate treatment or recycling. This study investigates the fertilizing potential of separated biogas digestates. These contain valuable nutrients and can be used in agriculture to close the nutrient cycle. Multi-year field experiments were established at two challenging sites in south-west Germany in 2010; results from 6 years are shown here. The objectives were to determine (1) whether separated digestates can complement or substitute mineral fertilizers and (2) their effect on long-term yield performance in different biomass cropping and fertilization systems. The fertilizing performance was assessed in a split-plot design with four replications using three cropping systems: (1) perennial grassland; (2) intercropping of triticale and clover grass; (3) silage maize. Five N fertilization treatments were applied, each at 150 kg N ha −1 :• mineral fertilizer (calcium ammonium nitrate) • combined solid digestate fraction and mineral fertilizer • solid digestate fraction • combined liquid digestate fraction and mineral fertilizer • liquid digestate fraction.The influences of site, cropping system, year and fertilization treatment were highly significant.The mineral fertilizer and combination "liquid digestate fraction + mineral fertilizer" mostly led to the highest quantitative biomass yields in all cropping systems at both sites. Fertilization with solid digestate fraction produced lowest yields in all fertilized plots, with results very often not significantly different from the untreated control. Maize achieved relatively high yields in years with favorable weather conditions; unfavorable conditions led to low yields. The grassland and intercropping systems were less susceptible to weather conditions, producing a more constant biomass supply irrespective of site, treatment and year. The separated biogas digestates were found to have a comparable effect to mineral fertilizer on biomass yield, but this varied with cropping system. In the intercropping system, complete substitution was Ehmann et al. Fertilizing With Separated Biogas Digestates possible. The solid fraction is more likely to contribute positively to soil humus in annual systems. In general, the combined application of digestate and mineral fertilizer is highly recommendable to meet crops' short-and long-term N demand, even on challenging sites. In this study, it allowed a mineral fertilizer input reduction of 66%.

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Cited by 368 publications

References 34 publications

Maize Nutrient Accumulation and Partitioning in Response to Plant Density and Nitrogen Rate: I. Macronutrients

Maize Nutrient Accumulation and Partitioning in Response to Plant Density and Nitrogen Rate: I. Macronutrients

A Review of Methods to Improve Nitrogen Use Efficiency in Agriculture

Fertilizing Potential of Separated Biogas Digestates in Annual and Perennial Biomass Production Systems

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