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Evaluating the impact of biostimulants at variable nitrogen rates in Mississippi corn production systemsGajula, Praveen 10 May 2024 (has links) (PDF)
A field study was conducted in 2022 and 2023 at two different locations in Mississippi (MS) implementing a split-plot design. Nitrogen (N) rates as the main plot including 0 (control), 90, 180, 269 kg N ha-1 at Starkville and 224 kg N ha-1 at Stoneville. The subplot was seven treatments, including a no biostimulant (check) and six commercially available microbial biostimulants (Source Corn®, Envita®, iNvigorate®, Blue N®, Micro AZTM, and Bio level phosN®) applied either as foliar at V4-V5 growth stages or in-furrow at planting. Only N rates positively affected grain yield and nitrogen use efficiency at all site years. The agronomic optimum N rate (AONR) differed across all site years, ranging from 202, 128, and 166 kg N ha-1 at Starkville 2023 and Stoneville 2022 and 2023. In summary, microbial biostimulants within this study showed minimal to no effect on corn grain yield and all other tested parameters.
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The Light Sensitivity of some Nitrogen-containing Furfural DerivativesTittle, Charles William 06 1900 (has links)
This study describes the creation of various furfural derivatives and their respective light sensitivity.
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Variation among grain sorghum genotypes in response to nitrogen fertilizerMahama, George Yakubu January 1900 (has links)
Master of Science / Department of Agronomy / P.V. Vara Prasad / Grain sorghum [Sorghum bicolor (L.) Moench] is an important crop in the semi-arid regions of Africa, Asia and United States. Productivity of grain sorghum is limited by soil fertility, especially nitrogen (N). Sorghum genotypes are known to vary in their response to nitrogen, however, the information on nitrogen use efficiency (NUE) is limited. The objectives of this research were to (a) determine the response of sorghum genotypes (hybrids and inbred lines) to nitrogen fertilizer (b) quantify genotypic differences in NUE; and (c) determine physiological and morphological basis of NUE. Field experiments were conducted at three locations in Kansas (Hays, Ottawa and Manhattan) during 2010 and 2011. Six hybrids and six inbred lines of grain sorghum were grown with 0, 45 and 90 kg N ha-1.The experimental design was a split-plot design with N regimes as main plots and genotypes as sub-plot, with four replications. Planting was done in May and June across all the locations, and nitrogen fertilizer (Urea, 46% N) was applied at emergence. Data on N concentration in the leaves, stems and grain were determined. NUE and components of N use were computed for Ottawa and Manhattan as follows: Nitrogen use efficiency (NUE): Grain weight / N supplied; Nitrogen utilization efficiency: Grain weight / N total in plant; Nitrogen uptake efficiency: N total in plant / N supplied; Percent fertilizer recovery = [uptake (fertilized plot) – N uptake (un- fertilized plot)] / [ N applied ] x 100; and Nitrogen harvest index (NHI) = Grain N / N total in plant. Where N supplied = Rate of N fertilizer applied + soil N supplied. Growth and yield data were collected at all locations. There were significant effects of genotypes (P < 0.05) and nitrogen (P < 0.05) on biomass and grain yield across all locations. Performance of hybrids was generally superior to the inbred lines of all traits. Sorghum hybrids 26506 and 99480 produced maximum grain yield across all locations. While inbred lines B35 and SC35 had the lowest grain yield. Maximum biomass and grain yield was obtained at 90 kg N ha-1, followed 45 kg N ha-1, and lowest in 0 N kg ha-1. There were significant differences among genotypes for all NUE traits at Ottawa and Manhattan. Across genotypes, total NUE ranged from 17.2 to 42.6 kg kg-1, utilization efficiency from 24.3 to 60.2 kg kg-1, N uptake efficiency ranged from 56.1 to 82.5%, recovery from 2 to 52%, and NHI from 43.6 to 81.3%. Among the genotypes, 99480 and 26506 both known to be post–flowering drought tolerance were high in NUE and component of N use. While genotypes B35 and SC35 were the lowest in NUE and components of N use. Overall, our data suggest that there were significant differences for NUE traits in sorghum hybrids and inbred lines. There are opportunities to breed for higher NUE in grain sorghum.
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The effect of available nitrogen upon the growth and nitrogen fixing ability of AzotobacterBriscoe, Faith Winifred. January 1933 (has links)
Call number: LD2668 .T4 1933 B72
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The effect of nitrogen fertilizer on nitrification and accumulation of organic matter in the soil, and yield and composition of wheat following normal and excessive applications of straw in pot culturesCrofton, Joseph Celester. January 1947 (has links)
LD2668 .T4 1947 C7 / Master of Science
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A comparison of the amount of nitrogen fixed by common, rhizomatous, and creeping alfalfasKolp, Bernard Joseph. January 1955 (has links)
Call number: LD2668 .T4 1955 K64 / Master of Science
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SYNTHESIS, CHARACTERIZATION AND REACTIONS OF TERTIARY PHOSPHINE COMPLEXES OF COBALT DERIVATIVES OF NITROGEN OXIDES.VALLENILLA, CLEMENTE DIOGENES. January 1985 (has links)
Co(NO)(NO₂)₂L₂ complexes (L = PPh₃, PMePh₂, PMe₂Ph, PMe₃, PEt₃, PEt₂Ph, PEtPh₂, PPrPh₂, PBu₃ and 1/2DPPPr) were prepared from the reactions of Co(NO)X₂L₂ (X = Cl, Br) with sodium nitrite in methanol freshly distilled from magnesium methoxide. The complexes were characterized by elemental analysis, 15-N labeling, infrared and NMR spectroscopy. The crystal structure of Co(NO)(NO₂)₂(PMePh₂)₂ was determined by X-ray diffraction. The cobalt atom has tetragonal pyramidal geometry. The nitrosyl group in the axial position is strongly bent. The NO₂ ligands have two different ligating geometries: one is bound to cobalt through the nitrogen atom and the other is bidentate forming an asymmetric four membered ring. The phosphine ligands are equivalent and trans to each other. Multinuclear NMR spectroscopy (¹H, ³¹P, ¹⁵N and ¹⁴N) was used to determine the solution structure of Co(NO)(NO₂ )₂L₂ complexes, to study mono and bisnitrosyls of cobalt, to establish some correlations between NMR parameters and structural characteristics of these complexes and to follow their reactions in solution. Reactions of Co(NO)(NO₂)₂L₂ with CO, NO and RCOX were observed to produce Co(NO)₂XL complexes. Since the structure may be indicative of electronic requirements at the metal center as well as the reactivity of the compounds, The crystal structures of Co(NO)₂Cl(PPh₃) and Co(NO)₂(ONO)(PPh₃) were also determined. In these complexes the cobalt atoms have pseudotetrahedral geometry. The CoNO angles are in the range considered to be linear. They are geniculated in an "atracto" conformation. Co(NO)(NO₂)₂L₂ and Co(NO)₂(ONO)L complexes react with oxygen in the solid state or in solution to form Co(NO₃)₂(OL)₂ complexes. When the reactions with O₂ were carried out in the presence of an excess of olefins, the formation of nitrates is inhibited Co(NO₂)₂(OL)₂ and olefin oxides are formed instead. The crystal structures of Co(NO₃)₂(OPMePh₂)₂ and Co(NO₂)₂(OPMePh₂)₂ were determined by X-ray diffraction. In these complexes, the NO₃ and NO₂ groups are bidentate. They are arranged in a cis configuration around the cobalt atom.
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Behavior of Nitrogenous Fertilizers in Alkaline Calcareous Soils: I. Nitrifying Characteristics of some Organic Compounds under Controlled ConditionsFuller, W. H., Caster, A. B., McGeorge, W. T. 10 1900 (has links)
This item was digitized as part of the Million Books Project led by Carnegie Mellon University and supported by grants from the National Science Foundation (NSF). Cornell University coordinated the participation of land-grant and agricultural libraries in providing historical agricultural information for the digitization project; the University of Arizona Libraries, the College of Agriculture and Life Sciences, and the Office of Arid Lands Studies collaborated in the selection and provision of material for the digitization project.
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NCR-sensitive gene expression and regulation of nitrogen interconversion by VID30 in Saccharomyces cerevisiaeVan der Merwe, George K., (George Karel)1968- 03 1900 (has links)
Dissertation (PhD)--University of Stellenbosch, 2002. / ENGLISH ABSTRACT: Saccharomyces cerevisiae uses the nitrogenous compounds in its environment
selectively. The basis of this phenomenon is the transcriptional regulation of genes
whose products are required for nitrogen catabolism. A rich nitrogen source represses
the expression of genes required for the degradation of poor nitrogen sources via the
action of the target of rapamyein (TOR) signaling cascade. If only a poor nitrogen
source is available, these genes are derepressed. This process is known as nitrogen
catabolite repression (NCR) or nitrogen regulation.
The DALI and DAL4 genes of S. cerevisiae are transcribed divergently from the 829
bp intergenic region. The five known UASNTR elements (GATAI-5) were mutated in the
full context of the intergenic promoter. All five elements are required for the
transcriptional activation of DAL4. The two elements most proximal to DAL4 (GATA4
and GATA5) contributed the most and the one most distal (GATAI) contributed the least
to its expression. In contrast, three of the five elements (GATA2-4) are required for
DALI activation. In addition, analyses revealed that no single element is shared equally
between these two genes. Predictions as to the function of known nitrogen-regulating
elements based on their sequence and location proved to be inaccurate in some cases.
Mutation analyses of the three UISALL elements present in the intergenic promoter
region revealed that UIS8, which does not share a high degree of homology with the
consensus UISALL sequence, is required the most for transcriptional induction of both
DALI and DAL4. Also, UIS7, which shares the most similarity with the UISALL
consensus sequence, has the phenotype of a repressor-like element when mutated.
These observations therefore portray the opposite phenotypes of what was expected.
We identified a regulator, Vid30p, which is required for the transcriptional response
of S. cerevisiae in low ammonia conditions. Genetic analyses of the vid30/j, mutant
indicate that Vid30p functions by regulating the expression of genes required for the
production and degradation of glutamate. The transcription of VID30 is NCR-sensitive,
highly induced by low concentrations of ammonia, and rapamycin-sensitive. In
addition, the vid30/j, mutant is hypersensitive to rapamycin, indicating that this protein
is, directly or indirectly, controlled by the TOR signaling pathway. / AFRIKAANSE OPSOMMING: Saccharomyces cerevisiae het die vermoeë om stikstofbronne vanuit die omgewing
selektief te benut. Die basis van hierdie verskynsel is die transkripsionele regulering
van gene wat vir proteïene kodeer wat stikstof katabolisme bemiddel. 'n Goeie
stikstofbron onderdruk die transkripsie van gene wat met die degradering van swak
stikstofbronne gemoeid is. Hierdie onderdrukking word deur die teiken-van-rapamisien
(TVR)-seintransduksiepad bewerkstellig. Wanneer slegs 'n swak stikstofbron
beskikbaar is, word hierdie gene geaktiveer. Hierdie verskynsel staan as
stikstofkatabolietonderdrukking (SKR) of stikstofregulering bekend.
Die DALI- en DAL4-gene van S. cerevisiae word divergent vanaf 'n 829 bp
intergeniese area getranskribeer. Vyf UASNTR-elemente (GATAI-5) is in die volle
konteks van die intergeniese promotor gemuteer. Al vyf elemente word vir DAL4
transkripsionele aktivering benodig. Die twee elemente mees proksimaal tot DAL4
(GATA4 en GATA5) lewer die grootste bydrae tot DAL4-geenuitdrukking, terwyl die
mees distale element (GATAI) die kleinste bydrae lewer. In teenstelling hiermee lewer
slegs drie van die vyf elemente (GATA2-4) 'n noemenswaardige bydrae tot DALI se
uitdrukking. Nie een van die vyf elemente lewer 'n gelykwaardige bydrae tot die
uitdrukking van DALI en DAL4 nie. Voorspellings betreffende die bydrae van die
onderskeie UASNTR-elemente tot die uitdrukking van die DALI- en DAL4-gene,
gebaseer op die sekwens en die posisie van die element in die promotor, was meestal
onakkuraat.
Die drie U/SALL-elemente in die intergeniese area is gemuteer en toon dat U/S8, wat
nie 'n groot mate van homologie met die U/SALL konsensus sekwens deel nie, die mees
kritiese element vir transkripsionele induksie van beide DALI en DAL4 is. UIS7, wat 'n
hoër mate van homologie met die UISALL konsensus sekwens deel, toon die fenotipe van
'n onderdrukkingselement wanner dit gemuteer word. Hierdie waarnemings is dus die
teenoorgestelde van wat verwag is.
Ons het 'n reguleerder, Vid30p, geïdentifiseer wat benodig word VIr die
transkripsionele response van stikstofgereguleerde gene in lae konsentrasie ammonium.
Genetiese analises van die vid3011 mutant toon dat Vid30p funksioneer deur die
transkripsie van gene gemoeid met die vorming en degradering van glutamaat te reguleer. Die transkripsie van V/D30 is SKO-sensitief, word sterk deur lae
konsentrasies ammonium geïnduseer, en is rapamisien-sensitief. Die vid30t!. mutant is
ook hipersensitief vir rapamisien, wat aandui dat Vid30p, direk of indirek, deur die
TVR-seintransduksiepad gereguleer word.
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Addition reactions of 3H-indoles and their N-oxides單慧媚, Sin, Wai-mei, Della. January 1992 (has links)
published_or_final_version / Chemistry / Doctoral / Doctor of Philosophy
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