Nitrogen Application Rate and Genotype Effects on Switchgrass Production and Chemical Characteristics

Seepaul, Ramdeo; Macoon, Bisoondat; Reddy, K. Raja; Evans, William B.

doi:10.4236/ajps.2016.73047

Cited by 7 publications

(11 citation statements)

References 27 publications

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“…Averaged across time of harvest and year, NUE decreased from 46 kg kg −1 N applied at 45 kg N ha −1 to 22 kg kg −1 N applied when fertilized with 180 kg N ha −1 (Table 4). The present results support previous findings that showed a decrease in NUE with increased N application rate (Seepaul et al, 2016). In Texas, switchgrass NUE was found to be greatest at 56 to 112 kg N ha −1 (Muir et al, 2001), which was similar to the 45 to 90 kg N ha −1 range reported in the present study.…”

Section: Resultssupporting

confidence: 93%

Nitrogen Fertilizer Application Effects on Switchgrass Herbage Mass, Nutritive Value and Nutrient Removal

2017

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Switchgrass (Panicum virgatum L.) can provide summer forage when forage production from cool‐season grasses is limited. This experiment was conducted over two growing seasons (2014 and 2015) to determine nitrogen (N) fertilizer application rate and time of harvest effect on switchgrass herbage mass, nutritive value, and nutrient removal. Treatments consisted of a split‐plot arrangement of five N rates (0, 45, 80, 135, and 180 kg ha−1) applied annually as main plots and harvest time (harvested in July for forage or October for biomass) as subplots in a randomized complete block design with three replications. Nitrogen rate × time of harvest interaction had no effect on herbage mass or nutritive value. Increasing N application rates increased herbage mass, crude protein, in vitro dry matter digestibility, and neutral detergent fiber concentrations, but not acid detergent fiber. A quadratic function described the relationship between herbage mass and N rate, with maximum yield occurring at 151 kg N ha−1. The economic optimum N rates ranged from 90 to 120 kg N ha−1 and depend on switchgrass hay price and N fertilizer costs. Generally, herbage mass was greater for switchgrass harvested for biomass, but nutritive value and nutrient removal were greater when switchgrass was harvested for forage. Switchgrass herbage mass and nutrient removal were greater in 2014 than in 2015. Our findings showed that N fertilizer rates for switchgrass under rain‐fed conditions need to be adjusted on the basis of expected herbage mass produced, hay value, and prior year N removal rates.

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Section: Resultssupporting

confidence: 93%

Nitrogen Fertilizer Application Effects on Switchgrass Herbage Mass, Nutritive Value and Nutrient Removal

2017

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“…Applied N did not result in consistent response of biomass yields to standardize N fertilizer recommendation. Inconsistent biomass yields in recent years have also been reported by other N studies (Lemus et al, 2008;Muir et al, 2001;Reynolds, Walker, & Kirchner, 2000;Seepaul, Macoon, Reddy, & Evans, 2016). In our study, the 2010 yield was most affected by N fertilizer, having the largest yield per kg N applied compared with prior years, 0.024-0.036 Mg ha −1 per kg N ha −1 applied.…”

Section: Switchgrass Yield Responses To Nitrogen Fertilizationsupporting

confidence: 82%

Nitrogen affecting switchgrass yield, nitrogen removal, and use efficiency

Massey

Antonângelo

Zhang

2020

Agrosystems Geosci & Env

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Best management practices for switchgrass (Panicum virgatum L.) fertilization in the production of biofuel feedstock and forage hay are variable depending on climate, harvest timing, and variety. A study of N fertilization was conducted to evaluate the yield response, nutrient removal, and nitrogen use efficiency (NUE) in 12 yr old switchgrass stands in Stillwater, OK. Seven rates of N fertilizer were applied ranging from 0 to 235.2 kg N ha−1 for 3 consecutive years (2008, 2009, and 2010). Positive linear trends in yield with increasing rates of N fertilizer (P < .05) were observed in two out of three years. Differences in N removal due to N fertilization were found in all studied years although responses were inconsistent. Nitrogen concentration in harvested biomass increased as N rates and biomass yield increased. Nitrogen use efficiency increased with N rate (P < .05) although many NUE values were negative up to application rate of 100.8 kg N ha−1. Better understanding of nutrient uptake and use efficiency, removal with harvests, and cycling within the plant could provide more refined fertilization practices in switchgrass production.

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“…Hybrids 103061 and 103084 stood out for NDF and ADF concentrations when compared to the other hybrids, and also showed a lower or similar NDF and ADF contents than Azulão and Aruana (Figure b,c–3b,c). Variability for NDF and ADF also was observed by Seepaul et al () in a study with different genotypes of switchgrass ( Panicum virgatum L.). Our results indicate that cell wall components may change in different years in response to N supply, precipitation and temperature, with genotypes responding dissimilarly.…”

Section: Discussionsupporting

confidence: 65%

Nutritive value and herbage mass in hybrids of Paspalum plicatulum × Paspalum guenoarum fertilized with nitrogen or in mixture with temperate legumes

et al. 2020

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Animal production in tropical and subtropical areas of the world is largely dependent on native or cultivated pastures, which requires higher production, quality and adaptation of forage plants (Jank, Valle, & Resende, 2011). Agronomic practices such as nutrient management and species selection or the combination of these two factors are some of the options for increasing dry matter yield (DMY) and forage nutritive value in pastures. Proper soil fertility management is required for efficient grass forage production. Nitrogen (N) has an effect on crop growth, development and physiological processes (Seepaul, Macoon, Reddy, & Evans, 2016), and supply of N fertilizer tends to improve yields and nutritive value in warm-season grasses (Obour,

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Nitrogen Application Rate and Genotype Effects on Switchgrass Production and Chemical Characteristics

Cited by 7 publications

References 27 publications

Nitrogen Fertilizer Application Effects on Switchgrass Herbage Mass, Nutritive Value and Nutrient Removal

Nitrogen Fertilizer Application Effects on Switchgrass Herbage Mass, Nutritive Value and Nutrient Removal

Nitrogen affecting switchgrass yield, nitrogen removal, and use efficiency

Nutritive value and herbage mass in hybrids of Paspalum plicatulum × Paspalum guenoarum fertilized with nitrogen or in mixture with temperate legumes

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