scholarly journals Plant‐available soil nitrogen fluxes and turfgrass quality of kentucky bluegrass fertilized with humic substances

Crop Science ◽  
2021 ◽  
Author(s):  
Alex J. Lindsey ◽  
Adam W. Thoms ◽  
Marshall D. McDaniel ◽  
Nick E. Christians
Keyword(s):  
Humic Substances ◽  
Soil Nitrogen ◽  
Kentucky Bluegrass ◽  
Nitrogen Fluxes ◽  
Turfgrass Quality

scholarly journals Evaluation of Humic Fertilizers Applied at Full and Reduced Nitrogen Rates on Kentucky Bluegrass Quality and Soil Health

Agronomy ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 395
Author(s):  
Alex J. Lindsey ◽  
Adam W. Thoms ◽  
Marshall D. McDaniel ◽  
Nick E. Christians
Keyword(s):  
Microbial Biomass ◽  
Humic Substances ◽  
Management Practices ◽  
Soil Health ◽  
Chemical Properties ◽  
Kentucky Bluegrass ◽  
N Fertilizer ◽  
Turfgrass Quality ◽  
N Rates ◽  
Fertilizer Rates

Soil health and sustainable management practices have garnered much interest within the turfgrass industry. Among the many practices that enhance soil health and sustainability are applying soil additives to enhance soil biological activity and reducing nitrogen (N) inputs—complimentary practices. A two-year study was conducted to investigate if reduced N fertilizer rates applied with humic substances could provide comparable turfgrass quality as full N rates, and whether humic fertilizers would increase biological aspects of soil health (i.e., microbial biomass and activity). Treatments included synthetic fertilizer with black gypsum (SFBG), poly-coated humic-coated urea (PCHCU; two rates), urea + humic dispersing granules (HDG; two rates), urea, stabilized nitrogen, HDG, and a nontreated control. Reduced rates of N with humic substances maintained turfgrass quality and cover, and reduced clipping biomass compared to full N rates. There were no differences in soil physical and chemical properties besides soil sulfur (S) concentration. SFBG resulted in the highest soil S concentration. Fertilizer treatments had minimal effect on microbial biomass and other plant-available nutrients. However, PCHCU (full rate) increased potentially mineralizable carbon (PMC) and N (PMN) by 68% and 59%, respectively, compared to the nontreated control. Meanwhile SFBG and stabilized nitrogen also increased PMC and PMN by 77% and 50%, and 65% and 59%, respectively. Overall, applications of reduced N fertilizer rates with the addition of humic substances could be incorporated into a more sustainable and environmentally friendly turfgrass fertilizer program.

scholarly journals Growth, Quality, and Foliar Iron Concentration of Kentucky Bluegrass Treated with Chelated Iron Sources

1991 ◽  
Vol 116 (5) ◽  
pp. 798-801 ◽  
Author(s):  
R.J. Cooper ◽  
L.A. Spokas
Keyword(s):  
Iron Concentration ◽  
Field Studies ◽  
Kentucky Bluegrass ◽  
Repeated Application ◽  
Iron Citrate ◽  
Fe Content ◽  
Turfgrass Quality ◽  
Growth Quality ◽  
Similar Growth

Supplemental Fe fertilization to improve turfgrass quality has become an increasingly common practice on many turfgrass areas. Field studies were conducted to evaluate the nutrient uptake, growth, and quality of Kentucky bluegrass (Pea pratensis L.) treated with chelated Fe sources. Iron sources were evaluated over 2 years at 1.5,3.0, and 6.0 kg Fe/ha applied in May, July, and September of each year. Turf treated with an iron orthophosphate citrate source (Fe-PC) exhibited more foliar growth than nontreated turf on seven of 11 sampling dates during the study. Iron citrate sources [Fe-C(EI) and Fe-C(T)] and Fe-DTPA applications resulted in similar growth rates, never stimulating growth more than the Fe-PC source and rarely increasing growth compared with nontreated turf. Increasing the Fe rate within source did not typically increase growth. Iron-treated turf exhibited quality superior to nontreated turf throughout the study with all sources performing comparably. Increasing Fe rate did not result in a corresponding increase in quality, due to greater phytotoxicity at higher rates. Although several sources produced notable phytotoxicity at 6.0 kg Fe/ha, repeated application did not decrease turfgrass density. Iron tissue content increased linearly with rate on four of five sampling dates during the study however, no source resulted in tissue Fe content significantly higher than other sources. Application of sources containing supplemental P and/or K did not increase tissue P or K content. Chemical names used: iron citrate (Fe-C); iron diethvlenetriamine pentaacetate (Fe-DTPA); iron orthophosphate citrate (Fe-PC).

Polymetallic Catalysts for the Process of Hydrogenation of Nitrocompounds

2014 ◽  
Vol 618 ◽  
pp. 238-242
Author(s):  
Yermoldina Elmira ◽  
Kayrbekov Zhaksyntay ◽  
Aity Kali ◽  
Vasilina Gulzira
Keyword(s):  
Humic Substances ◽  
Palladium Catalysts ◽  
Catalytic Properties ◽  
Potassium Humate

Results of studies of humic substances in the quality of natural polymeric modifier for the coated palladium catalysts are presented in the paper, along with synthesis of new catalysts based on palladium – potassium humate, fixed on various inorganic carriers and their catalytic properties are studied. The catalysts may be placed in the following order according to activity: Pd-PHum/B-094 > Pd-PHum/Shungit (Sht), proc.1%КОН > Pd-PHum/Sht >> Pd-PHum/SiO2. More active and optimal are the catalysts of 0,8% Pd – Potassium’s Humat (1%)/B-94 and 0,8% Pd/Shungit 1% КОН.

Species Succession and Turf Quality of Tall Fescue and Kentucky Bluegrass Mixtures as Affected By Mowing Height

Crop Science ◽  
2014 ◽  
Vol 54 (3) ◽  
pp. 1220-1226 ◽  
Author(s):  
Stefano Macolino ◽  
Guido Pignata ◽  
Maurizio Giolo ◽  
Michael D. Richardson
Keyword(s):  
Tall Fescue ◽  
Kentucky Bluegrass ◽  
Species Succession ◽  
Turf Quality

scholarly journals Creeping Bentgrass Quality following Preemergence and Postemergence Herbicide Applications

HortScience ◽  
1994 ◽  
Vol 29 (8) ◽  
pp. 880-883 ◽  
Author(s):  
B. Jack Johnson
Keyword(s):  
Field Experiments ◽  
Creeping Bentgrass ◽  
Monosodium Salt ◽  
Putting Green ◽  
Methylarsonic Acid ◽  
Turfgrass Quality ◽  
June July ◽  
Postemergence Herbicides ◽  
Quinolinecarboxylic Acid

Three field experiments were conducted to determine if several preemergence and postemergence herbicides were safe to apply to creeping bentgrass (Agrostis stolonifera L. `Penncross') maintained at putting green height. When dithiopyr was applied at preemergence in late February or early March, the emulsifiable concentrate formulation (≤1.7 kg·ha-1) and granular formulation (≤1.1 kg·ha-1) did not reduce the quality or cover of creeping bentgrass. Applied at preemergence, bensulide plus oxadiazon at 6.7 + 1.7 kg·ha-1 and 13.4 + 3.4 kg·ha-1 reduced turfgrass quality for 2 to 3 weeks and 8 weeks after treatment, respectively. When MON 12051 and monosodium salt of methylarsonic acid (MSMA) (≤0.14 and ≤2.2 kg·ha-1, respectively) were applied at postemergence to creeping bentgrass in early June, the reduction in turfgrass quality varied from slight to moderate for 1 to 2 weeks, but turfgrass fully recovered with no effect on turfgrass cover. Quinclorac applied at postemergence in early June at ≥0.6 kg·ha-1 severely reduced creeping bentgrass quality and cover for ≥8 weeks. Diclofop at 0.6 kg·ha-1 applied to creeping bentgrass in June, July, or August maintained consistently higher quality and cover ratings than when applied at ≥1.1 kg·ha-1. Diclofop applied at 0.6 kg·ha-1 in June and repeated at the same rate in July reduced quality of creeping bentgrass less than when applied at 1.1 kg·ha-1 at any date. Chemical names used: O,O-bis (1-methylethyl) S-{2-[(phenylsulfonyl)amino]ethyl} phosphorodithioate (bensulide); (±)-2-[4-(2,4-dichlorophenoxy)phenoxy]propanoic acid (diclofop); S,S-dimethyl-2-(difluoromethyl)-4-(2-methylpropyl)-6-(trifluoromethyl)-3,5-pyridinedicarbothioate (dithiopyr); methyl-5-{[(4,6-dimethoxy-2-pyrimidinyl)amino] carbonylaminosulfonyl}-3-chloro-1-methyl-1-H-pyrazol-4-carboxylate (MON 12051); 3-[2,4-dicloro-5-(1-methylethoxy)phenyl]-5-(1,1-dimethylethyl)-1,3,4-oxadiazol-2-(3H)-one (oxadiazon); 3,7-dicloro-8-quinolinecarboxylic acid (quinclorac).

scholarly journals EVALUATION OF WATER CONSERVATION POTENTIAL OF NON-TURF GROUNDCOVERS VS. KENTUCKY BLUEGRASS UNDER INCREASING LEVELS OF DROUGHT STRESS.

HortScience ◽  
1992 ◽  
Vol 27 (6) ◽  
pp. 676c-676
Author(s):  
David Staats ◽  
James E. Klett
Keyword(s):  
Drought Stress ◽  
Field Study ◽  
Water Conservation ◽  
Kentucky Bluegrass ◽  
Good Alternative ◽  
The Other ◽  
Irrigation Treatments ◽  
Better Than

In June 1991, a two year field study was initiated to examine if three non-turf groundcovers with reputations for using low amounts of water actually use less water than Kentucky bluegrass (KBG). Irrigation treatments were based on percentages of ET (100%, 75%, 50%, 25%, 0%) and calculated by the modified Penman equation. Results from the 1991 season indicate that at the 100% and 75% treatments Potentilla tabernaemontani and Cerastium tomentosum were significantly better than the other species in terms of establishment and vigor but quality declined significantly at rates below 75%. At the 50% rate both KBG and Sedum acre maintained good quality although growth was slow. At the 25% rate, quality of KBG significantly declined while Sedum acre maintained good quality. Quality of Sedum acre declined only slightly at the 0% treatment and would be a good alternative to KBG if water conservation was a high priority in the landscape.

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