Dinitrogen (C2H2) fixation, total plant yield, and total nitrogen percentage in alfalfa (Medicago sativa L) as affected by plant density, cutting management, and cultivar

Bohl, William H.

doi:10.31274/rtd-180817-6212

Cited by 2 publications

(8 citation statements)

References 30 publications

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“…Similar results were obtained in a field study reported by Bohl (1981). This decrease in nitrogenase activity could not be explained by sloughing of nodules (Vance et al, 1979) as occurs in some perennial legumes after defoliation (Butler et al , 1959).…”

Section: Symbiotic Nitrogen Fixationsupporting

confidence: 89%

“…Kroontje and Kehr (1956) reported that roots of alfalfa cut two times during the seed ing year had higher N concentrations than alfalfa cut one or three times. Bohl (1981) found a 21% greater N concentration in alfalfa roots and crowns (combined) of an uncut, secondyear stand than roots and crowns of alfalfa cut three or four times. Continuing these managements for another year resulted in slightly lower N concentrations in roots and crowns of the four-cut system compared to the three-or no-cut systems.…”

Section: Symbiotic Nitrogen Fixationmentioning

confidence: 81%

“…Kroontje and Kehr (1956) found that root N concentration, averaged over six cultivars, was lower under a one-cut manage ment than when cut two or three times. Bohl (1981), on the other hand, found that roots of uncut alfalfa contained sig nificantly higher concentrations of N than roots of alfalfa cut either three or four times during the first season of pro duction.…”

Section: Proteinmentioning

confidence: 93%

“…Jarvis (1962) observed no increase in forage yield at -2 densities above 43 plants m . Bohl (1981) Annual yields of IVDEM were always lowest when winterdormant cultivars were harvested according to the bud man agement but differences between the bud and first-flower man agements were not significant in 1980 (Table 1.4). The greatest IVDDM yield, 9.43 mt ha~^, was obtained with the midflower and early-pod managements in 1981.…”

Section: Plant Densitiesmentioning

confidence: 93%

“…The root mass of uncut alfalfa virtually doubled during that time. Bohl (1981) reported a constant decrease in end-of-season root yields as number of harvests increased from zero to either three or four times during the first season of production. Imposing these manage ments for a second season resulted in similar root yields for the zero and four-cut managements, both of these being lower than yields under the three-cut management.…”

Section: Phytomass Accumulationmentioning

confidence: 99%

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Studies on nitrogen accumulation, fiber chemistry, and in vitro digestibility of alfalfa

Albrecht

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Section: Symbiotic Nitrogen Fixationsupporting

confidence: 89%

Section: Symbiotic Nitrogen Fixationmentioning

confidence: 81%

Section: Proteinmentioning

confidence: 93%

Section: Plant Densitiesmentioning

confidence: 93%

Section: Phytomass Accumulationmentioning

confidence: 99%

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Studies on nitrogen accumulation, fiber chemistry, and in vitro digestibility of alfalfa

Albrecht

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Viral infection can reduce the net nitrogen inputs of legume break crops and cover crops

Marchetto

Power

2020

Ecological Applications

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Legumes are used in crop rotations by both large‐scale and smallholder farmers alike to increase soil fertility, especially before high‐nitrogen‐demanding crops such as corn (maize). Legume crop residues and green manures are rich in nitrogen due to mutualistic rhizobia, bacteria that live in their roots and convert atmospheric nitrogen into a biologically available form. Growers can obtain recommendations from local extension offices about how much less inorganic nitrogen fertilizer needs to be added to a subsequent crop following different legume break crops for the predominant soil type (the nitrogen fertilizer replacement value, or NFRV). Due to the intimate relationship between legumes and rhizobia, conditions that affect plant health can also affect the rhizobia and how much nitrogen they provide. We use a combination of empirical data and previously published values to estimate reductions in nitrogen inputs under outbreaks of plant viruses of varying severity. We also use historical fertilizer prices to examine the economic impacts of this lost fertilizer for farmers. We find that fertilizer losses are greatest for crops that fix large amounts of nitrogen, such as clover and alfalfa as opposed to common bean. The economic impact on farmers is controlled by the proportion of plants with viral infections and the price of synthetic fertilizer. In a year of high disease prevalence, attention is normally focused on the yield of the diseased crops. We suggest that farmers growing legumes as break crops should be concerned about yields of subsequent crops as well. Viral diseases can be difficult to diagnose in the field, so the easiest way for farmers to prevent unexpected yield losses in subsequent crops is to test their soil when it is feasible to do so.

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Dinitrogen (C2H2) fixation, total plant yield, and total nitrogen percentage in alfalfa (Medicago sativa L) as affected by plant density, cutting management, and cultivar

Cited by 2 publications

References 30 publications

Studies on nitrogen accumulation, fiber chemistry, and in vitro digestibility of alfalfa

Studies on nitrogen accumulation, fiber chemistry, and in vitro digestibility of alfalfa

Viral infection can reduce the net nitrogen inputs of legume break crops and cover crops

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