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  • Slaton, Nathan A.  (8)
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Sprache
Erscheinungszeitraum
Fachgebiete(RVK)
  • 1
    Online-Ressource
    Online-Ressource
    Grain Yield and Kernel Smut of Rice as Affected by Preflood and Midseason Nitrogen Fertilization in Arkansas
    Wiley ; 2004
    In:  Agronomy Journal Vol. 96, No. 1 ( 2004), p. 91-
    Details
    In: Agronomy Journal, Wiley, Vol. 96, No. 1 ( 2004), p. 91-
    Materialart: Online-Ressource
    ISSN: 1435-0645
    URL: Article
    DOI: 10.2134/agronj2004.0091
    Sprache: Englisch
    Verlag: Wiley
    Publikationsdatum: 2004
    ZDB Id: 1471598-3
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 2
    Online-Ressource
    Online-Ressource
    Recovery of Nitrogen in Fresh and Pelletized Poultry Litter by Rice
    Wiley ; 2006
    In:  Soil Science Society of America Journal Vol. 70, No. 4 ( 2006-07), p. 1359-1369
    Details
    In: Soil Science Society of America Journal, Wiley, Vol. 70, No. 4 ( 2006-07), p. 1359-1369
    Kurzfassung: The N‐fertilizer value of preplant incorporated poultry litter for rice ( Oryza sativa L.) grown using the direct‐seeded, delayed‐flood (DF) production system is unknown. The research objective was to compare preplant incorporated fresh (FPL) and pelleted (PPL) poultry litter with urea applied preflood to determine the urea‐nitrogen (N) equivalence of poultry litter for rice. Fresh and pelleted litter were preplant incorporated at total‐N rates ranging from 34 to 270 kg N ha −1 and compared with urea applied preflood at rates ranging from 34 to 168 kg N ha −1 at five site‐years on silt loam soils. Net‐N uptakes and grain yields between FPL and PPL were similar, but significantly lower when compared with urea applied preflood, regardless of site‐year. By heading, when averaged across all N rates and site‐years, rice recovery of the urea‐N applied preflood averaged 76%. In contrast, the apparent recovery of N applied as FPL or PPL averaged only 14%. Net‐grain yields for rice fertilized with urea increased nonlinearly as N rate increased with near maximal yields produced with ≥101 kg urea‐N ha −1 Grain yields for FPL and PPL increased linearly and approached the near maximal yields produced with urea‐N only when 270 kg total‐N ha −1 was applied. Based on net grain yield, multiplying the total‐N content in FPL and PPL by 0.25 reasonably estimates its equivalence to urea applied preflood. Recommended preflood urea‐N rates should be decreased by 0.25 times the total N applied as poultry litter.
    Materialart: Online-Ressource
    ISSN: 0361-5995 , 1435-0661
    URL: Article
    DOI: 10.2136/sssaj2005.0298
    RVK:
    RA 4845
    Sprache: Englisch
    Verlag: Wiley
    Publikationsdatum: 2006
    ZDB Id: 241415-6
    ZDB Id: 2239747-4
    ZDB Id: 196788-5
    ZDB Id: 1481691-X
    SSG: 13
    SSG: 21
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 3
    Online-Ressource
    Online-Ressource
    Bermudagrass Forage Yield and Ammonia Volatilization as Affected by Nitrogen Fertilization
    Wiley ; 2011
    In:  Soil Science Society of America Journal Vol. 75, No. 2 ( 2011-03), p. 638-648
    Details
    In: Soil Science Society of America Journal, Wiley, Vol. 75, No. 2 ( 2011-03), p. 638-648
    Kurzfassung: Forage fertilization practices are changing because of poultry litter use restrictions and reduced NH 4 NO 3 availability. Our objectives were to compare bermudagrass [ Cynodon dactylon (L.) Pers.] yield and N uptake among N sources and rates and evaluate the influence of N‐fertilizer source on NH 3 volatilization. Four N sources, pelleted poultry litter (PPL), NH 4 NO 3 , urea, and urea + N ‐(n‐butyl) thiophosphoric triamide (NBPT) were applied at rates of 0 to 500 kg N ha −1 yr −1 to common bermudagrass from 2006 to 2008. Measurements included dry matter yield and total N uptake from each N source applied at 400 kg N ha −1 yr −1 A semi‐open static chamber method was used to measure NH 3 volatilization for 15 d from each N source applied at 400 kg N ha −1 yr −1 in three split applications. Dry matter increased linearly in 2006 and curvilinearly in 2007 and 2008 as N rate increased, with maximum yields of 9910 to 14,328 kg ha −1 Forage fertilized with ≤300 kg PPL‐N ha −1 yr −1 produced 78 to 96% of the dry matter as the same rates of NH 4 NO 3 The addition of NBPT to urea showed no consistent benefit to yield or N uptake compared with urea alone. Urea‐based fertilizers produced similar to slightly lower yields and N uptakes than NH 4 NO 3 Cumulative NH 3 –N loss was greatest for urea (10.4–18.7% of applied N), intermediate for urea + NBPT (2.0–3.9%), and 〈 1.5% for PPL and NH 4 NO 3 Given the limited availability of NH 4 NO 3 , restrictions on poultry litter use, and concerns about air quality, urea amended with NBPT is a suitable N source for bermudagrass.
    Materialart: Online-Ressource
    ISSN: 0361-5995 , 1435-0661
    URL: Article
    DOI: 10.2136/sssaj2010.0254
    RVK:
    RA 4845
    Sprache: Englisch
    Verlag: Wiley
    Publikationsdatum: 2011
    ZDB Id: 241415-6
    ZDB Id: 2239747-4
    ZDB Id: 196788-5
    ZDB Id: 1481691-X
    SSG: 13
    SSG: 21
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 4
    Online-Ressource
    Online-Ressource
    Correlation and Calibration of Soil Potassium Availability with Rice Yield and Nutritional Status
    Wiley ; 2009
    In:  Soil Science Society of America Journal Vol. 73, No. 4 ( 2009-07), p. 1192-1201
    Details
    In: Soil Science Society of America Journal, Wiley, Vol. 73, No. 4 ( 2009-07), p. 1192-1201
    Kurzfassung: Soil testing is an important tool for estimating soil K availability and determining how much fertilizer must be applied to realize crop yield potential and minimize fertilizer costs. Our primary objectives were to correlate relative rice ( Oryza sativa L.) yield with Mehlich‐3 and 1 mol L −1 HNO 3 extractable K, define sufficient whole‐plant K concentrations at panicle differentiation (PD) and early heading (HDG), and calibrate K‐fertilizer rates with Mehlich‐3 soil K in the direct‐seeded, delayed‐flood rice production system. Potassium rate experiments were established at 32 site‐years on silt loams in eastern Arkansas. Relationships between selected parameters were evaluated with linear, curvilinear, and linear‐plateau models. The relationships between relative yield regressed against Mehlich‐3 and HNO 3 extractable K were significant and curvilinear. The final curvilinear models for Mehlich‐3 and HNO 3 K explained 63 and 43% of yield variability among site‐years, with predicted critical soil concentrations to produce 95% relative yield of 99 and 390 mg K kg −1 , respectively. Linear‐plateau models provided comparable critical soil K concentrations. Rice having whole‐plant K concentrations of 23.1 g kg −1 at PD and 13.0 g kg −1 at HDG were predicted to produce 95% relative yield. The predicted K‐fertilizer rates required to optimize rice grain yield depended on the model and ranged from 51 to 90, 41 to 70, 30 to 55, and 20 to 35 kg K ha −1 for soil having Mehlich‐3 soil K concentrations of 60, 70, 80, and 90 mg K kg −1 , respectively. The suggested Mehlich‐3 soil and plant K critical concentrations should be appropriate for other U.S. mid‐South rice‐producing areas using similar cultural production practices.
    Materialart: Online-Ressource
    ISSN: 0361-5995 , 1435-0661
    URL: Article
    DOI: 10.2136/sssaj2008.0200
    RVK:
    RA 4845
    Sprache: Englisch
    Verlag: Wiley
    Publikationsdatum: 2009
    ZDB Id: 241415-6
    ZDB Id: 2239747-4
    ZDB Id: 196788-5
    ZDB Id: 1481691-X
    SSG: 13
    SSG: 21
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 5
    Online-Ressource
    Online-Ressource
    Grain Yield and Kernel Smut of Rice as Affected by Preflood and Midseason Nitrogen Fertilization in Arkansas
    Wiley ; 2004
    In:  Agronomy Journal Vol. 96, No. 1 ( 2004-01), p. 91-99
    Details
    In: Agronomy Journal, Wiley, Vol. 96, No. 1 ( 2004-01), p. 91-99
    Kurzfassung: Kernel smut, Neovossia horrida ( Tilletia barclayana ), of rice ( Oryza sativa L.) has been a persistent disease in Arkansas for more than 50 yr. Recently, epidemic levels of kernel smut have occurred on highly susceptible cultivars, which have increased awareness within the rice industry of this disease. Nitrogen fertilization treatments consisting of four preflood (50–152 kg N ha −1 ) and three midseason (0–100 kg N ha −1 ) N rates were arranged in a factorial design and used to delineate the effects of N rate and application timing on rice yield and disease incidence and severity in five site‐year–cultivar studies (environments). Significant environment × preflood N rate interactions occurred for yield, incidence, and severity. The minimum preflood N rates, averaged across midseason N rates, that produced maximum yields varied among the environments and ranged from 84 to 152 kg N ha −1 . Depending on the environment, disease incidence ranged from 2 to 93% and severity ranged from 〈 0.1 to 4.8% among preflood N rates. Preflood N rate had no significant effect on smut incidence and severity for three environments receiving optimum‐to‐excessive N and a fourth environment receiving inadequate‐to‐optimum N. For the remaining environment that received optimum‐to‐excessive N, incidence increased linearly (43–93%), and severity increased nonlinearly (0.5–4.8%) as preflood N rate increased. Midseason N rate did not affect severity but caused a positive, linear increase for incidence. Data suggest that excessive preflood N has the greater potential to increase kernel smut but only when environmental conditions are favorable for kernel smut.
    Materialart: Online-Ressource
    ISSN: 0002-1962 , 1435-0645
    URL: Article
    DOI: 10.2134/agronj2004.9100
    Sprache: Englisch
    Verlag: Wiley
    Publikationsdatum: 2004
    ZDB Id: 1471598-3
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 6
    Online-Ressource
    Online-Ressource
    Cultivar and Seeding Date Effects on Kernel Smut of Rice
    Wiley ; 2007
    In:  Agronomy Journal Vol. 99, No. 2 ( 2007-03), p. 521-529
    Details
    In: Agronomy Journal, Wiley, Vol. 99, No. 2 ( 2007-03), p. 521-529
    Kurzfassung: Rice ( Oryza sativa L.) cultivars vary in susceptibility to kernel smut ( Tilletia barclayana ). The incidence and severity of kernel smut is believed to increase as rice seeding is delayed. The research objective was to evaluate the influence of seeding date on kernel smut incidence and severity of rice. Kernel smut incidence and severity and grain yield were evaluated on selected cultivars seeded on three or four dates at 7 site‐years in Arkansas. Grain yield was generally greatest when rice was seeded in April and declined as seeding was delayed until June. Kernel smut incidence ( r = 0.38) and severity ( r = 0.38) were significantly, albeit weakly, correlated with seeding date. Depending on site‐year, kernel smut incidence and severity were affected by cultivar, seeding date, or their interaction. Within each site‐year, incidence and severity were generally lowest numerically for the first (earliest) seeded rice. With subsequent seedings, kernel smut incidence and severity increased at 1 site‐year, remained constant at 2 site‐years, or showed no trend (i.e., fluctuated) among seeding dates at 4 site‐years, but 3 of the 4 site‐years had greater incidence than the first seeding. Cultivars rated highly susceptible to kernel smut generally had greater incidence and severity values than susceptible or moderately susceptible cultivars. Kernel smut incidence and severity averages were not significantly correlated with air temperatures or precipitation for 20 d after anthesis or 7 d before and after anthesis. Data suggest that seeding the least‐susceptible cultivars during the earliest recommended period may reduce damage from this disease in most years.
    Materialart: Online-Ressource
    ISSN: 0002-1962 , 1435-0645
    URL: Article
    DOI: 10.2134/agronj2006.0123
    Sprache: Englisch
    Verlag: Wiley
    Publikationsdatum: 2007
    ZDB Id: 1471598-3
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 7
    Online-Ressource
    Online-Ressource
    Boron Fertilization Influences on Soybean Yield and Leaf and Seed Boron Concentrations
    Wiley ; 2006
    In:  Agronomy Journal Vol. 98, No. 1 ( 2006-01), p. 198-205
    Details
    In: Agronomy Journal, Wiley, Vol. 98, No. 1 ( 2006-01), p. 198-205
    Kurzfassung: Soybean [ Glycine max (Merr.) L.] is considered relatively insensitive to B deficiency. However, B deficiency has recently become a common nutrient deficiency of soybean in northeast Arkansas. Field studies were conducted on four alkaline silt‐loam soils in northeast Arkansas to determine the influence of B application time and rate on soybean growth, tissue B concentration, and seed yield. Boron fertilizer was applied at 0, 0.28, 0.56, 1.12, and 2.24 kg B ha −1 near the V2 or R2 growth stages. Boron fertilization had no significant effect on soybean yield at one site but increased seed yields from 4 to 130% at three sites. At the most responsive site, B application at V2 increased yields by 13% compared with applications at R2. In contrast, at a site where leaf B concentrations were sufficient for soybean receiving no B, B applied at the R2 stage significantly increased seed yields by 5% compared with V2 B applications. Trifoliate leaf B concentrations at the R2 stage increased as B rate increased. Seed B concentrations also increased as B rate increased. Boron applied at the R2 stage resulted in equal or greater seed B concentrations than B applied at the V2 stage. Application of 0.28 to 1.12 kg B ha −1 during early vegetative or reproductive growth was sufficient to produce near maximal yields. The expected severity of B deficiency plus fertilizer and application costs associated with B fertilization should be considered when selecting the most appropriate B fertilization strategy.
    Materialart: Online-Ressource
    ISSN: 0002-1962 , 1435-0645
    URL: Article
    DOI: 10.2134/agronj2005-0131
    Sprache: Englisch
    Verlag: Wiley
    Publikationsdatum: 2006
    ZDB Id: 1471598-3
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 8
    Online-Ressource
    Online-Ressource
    Correlation and Calibration of Soil Potassium Availability with Soybean Yield and Trifoliolate Potassium
    Wiley ; 2010
    In:  Soil Science Society of America Journal Vol. 74, No. 5 ( 2010-09), p. 1642-1651
    Details
    In: Soil Science Society of America Journal, Wiley, Vol. 74, No. 5 ( 2010-09), p. 1642-1651
    Kurzfassung: The ability of soil tests to identify nutrient‐deficient soils and recommend fertilizer rates that optimize agronomic yield is essential for profitable soybean [ Glycine max (L.) Merr.] production. Our objectives were to correlate relative soybean yield to Mehlich‐3 and 1 mol L −1 HNO 3 –extractable soil K and trifoliolate‐leaf K concentration at the R1 to R2 development stage and calibrate the K rates for Mehlich‐3‐extractable soil K. Experiments were established on silt loams at 34 site‐years planted with a Maturity Group IV or V cultivar and fertilized at five K rates (0–148 kg K ha −1 ). Mehlich‐3‐extractable soil K ranged from 46 to 167 mg K kg −1 and produced relative soybean yields of 59 to 100% when no K was applied. Eleven sites had Mehlich‐3‐extractable K 〈 91 mg K kg −1 and all responded positively to K fertilization. Soybean grown in soil having 91 to 130 mg K kg −1 responded positively at nine of 15 sites. Mehlich‐3 soil K explained 76 to 79% of the variability in relative yields and had critical concentrations of 108 to 114 mg K kg −1 , depending on the model. The linear‐plateau model predicted the critical HNO 3 –extractable soil K to be 480 mg K kg −1 Trifoliolate‐leaf K concentration increased significantly, positively, and linearly as Mehlich‐3‐ and HNO 3 –extractable soil K increased, but Mehlich‐3 soil K explained only 49 to 53% of the variation in trifoliolate‐leaf K. Mehlich‐3‐extractable K is an excellent predictor of soil K availability for soybean grown on silt loams in eastern Arkansas.
    Materialart: Online-Ressource
    ISSN: 0361-5995 , 1435-0661
    URL: Article
    DOI: 10.2136/sssaj2009.0197
    RVK:
    RA 4845
    Sprache: Englisch
    Verlag: Wiley
    Publikationsdatum: 2010
    ZDB Id: 241415-6
    ZDB Id: 2239747-4
    ZDB Id: 196788-5
    ZDB Id: 1481691-X
    SSG: 13
    SSG: 21
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
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