Growers may consider replanting soybean [Glycine max (L.) Merr.] when stands are reduced early in the growing season because of such factors as seed quality, seedbed conditions, herbicide injury, weather events, etc. Stand reductions may occur well after emergence, but while there still is time to replant. Plant density studies established shortly after emergence may not best estimate the yield loss due to poor stands. Therefore, we thinned soybeans, which were growing at recommended densities, to determine the effect on yield of stand reductions at three early growth stages. The research was conducted for seven-location years in southern and southwestern Minnesota. Five uniform densities ranging from 50 000 to 150 000 plants per acre (ppa) were established using normal seeding rates and by thinning the resulting stands at three growth stages-VC, V3, and V6. Two nonuniform stands with either 1- or 2-ft gaps were also established 75 000 ppa. Yields were significantly lower for densities for 50 000 ppa than for densities of 75 000 and higher ppa. There was no significant effect on yield of densities ranging from 75 000 to 150 000 ppa, although regression analyses indicated higher yields at 125 000 ppa. Yields were significantly lower when stands were reduced at the V6 stage than at VC or V3 stages. Yields were reduced more by thinning to the low densities at the V3 and V6 stages than thinning to low densities at the VC stage. At 75 000 ppa, yields were reduced by 2.1% and 6.7% with gaps of 1 and 2 ft, respectively; but the difference was only significant with 2-ft gaps.

AbstractFoliar application of dinoseb (2‐sec‐butyl‐4‐.6‐dinitro phenol) has been reported to increase the grain yield of corn (Zea mays L.) The objective of our work was to evaluate the response of dent corn hybrids adapted to the northern region of the Corn Belt to foliar applications of dinoseb. Several rates of dinoseb were evaluated on corn grown at two locations for 4 years.Dinoseb with a surfactant was applied as a foliar spray at the rate of 190 to 238 liters/ha. In 1974–73, dinoseb rates evaluated ranged from 0 to 70 g a.i./ha and were applied 2 weeks prior to tassel ing. 1974–73 one rate (12.5 g a.i./ha) of dinoseb was applied when the unemerged tassel was 1.3 or 17.8 cm in length. Three hybrids of differing maturity were planted on two dates for the test. Grain yield and ear or kernel moisture percentages were determined for all experiments. Tasseling and silking dates, test weight, barrenness, and 100‐kernel weight were recorded in some experiments.In general, grain yields were not statistically affected by dinoseb foliar application. Yield differences were small and in many cases the numerical difference between dinoseb treated and nontreated plots was negative. Percent moisture at harvest, tasseling and silking dates, kernel test weight, 100‐kernel weight, and barrenness were not statistically affected by foliar application of dinoseb. The lack of a significant yield increase, the low mean response, and the inconsistent response do not support foliar application of dinoseb to enhance corn grain yield.

The mineralization-alteration zonation at Panguna is rationalized in terms of an over-printing of three broad alteration events which resulted from the progressive decline of an inner magmatic-hydrothermal system and its eventual disruption by the influx of heated external groundwaters. These three events are represented by amphibole-magnetite (early), K-silicate (main-stage) and feldspar-destructive (late, retrogressive) assemblages. Mineralization was associated with K-silicate alteration processes, and emphasis throughout the study is placed on main-stage events.Chemical analyses of important rock alteration types and their constituent minerals reveal interesting and useful variations. Mg/Mg + Fe ratios of both hydrothermal amphibole and biotite increase toward the ore zone. Only minor differences in TiO 2 contents and Mg/Mg + Fe ratios exist between texturally magmatic and hydrothermal biotites, and the Mg/Mg + Fe ratios of secondary biotite tend to be lower than in other porphyry deposits. Application of the biotite geothermometer of Beane (1974) yields biotitization temperatures in the range 370 degrees to 540 degrees C. Hydrothermal K-feldspar, Fe-Ti oxides, chlorite, sericite, and epidote show limited compositional variations. Chemical gains and losses observed in specific rock alteration types are consistent with mineralogic changes. The highly saline magmatic-hydrothermal ore fluids added Si, K, Cu, S, and Rb to K-silicate assemblages. They mobilized Ca, Na, Mg, Mn, Sr, Pb, Zn, and Zr from the potassic zone but redeposited most of these elements in the propylitic fringe. The resulting element zonation is similar to that observed in other porphyry deposits, with the mineralized central K-silicate zone coincident with high K, Cu, Cu/S, Rb, and Rb/Sr values, and decreased levels of Ca, Mn, Sr, K/Rb, Zn, and Pb. Although an outward temperature decline was the dominant control on the alteration-mineralization zonation, several additional interdependent factors were probably involved. These include chemical variations in the outward migrating fluids, the mafic wall-rock chemistry, and predominance of hydrothermal biotite.

Hydrogen‐ and oxygen‐isotope analyses of biotite (19), sericite (8), chlorite (2), quartz (27), and total rocks (37) from the Panguna porphyry‐copper deposit on Bougainville Island, place important constraints on the origin of the hydrothermal fluids responsible for mineralization and alteration in the mine region. Early high‐temperature amphibole‐magnetite alteration resulted from magmatic‐hydrothermal fluids. Several lines of evidence indicate 500°C as a realistic average temperature for mineralization, development of quartz veins, and biotitization processes. On the basis of mineral isotope data, responsible fluids could represent either 18O‐shifted ground‐waters or magmatic‐hydrothermal fluids at submagmatic temperatures. Independent evidence, as well as total‐rock 18O data, support the magmatic‐hydrothermal model. Late‐stage sericitization processes probably resulted from fluids produced by 18O shifting of groundwaters during the evolution of the propylitic zone. Outermost quartz veins and biotitization conceivably resulted from fluids similar to those that caused sericitization, indicating that some interaction between relatively cool, 18O‐poor meteoric waters and the ore fluids occurred near the margins of the deposit. The origin of the chlorite‐sericite alteration cannot be resolved solely by isotope studies.

Crop ScienceVolume 17, Issue 5 cropsci1977.0011183X001700050039x p. 823-823 Registration of Crop Cultivars Registration of Culbert Flax1 (Reg. No. 32) V. E. Comstock, V. E. ComstockSearch for more papers by this authorJ. H. Ford, J. H. Ford Professor and associate professor, Dep. of Agronomy and Plant Genetics, Univ. of Minnesota, St. Paul, MN 55108 and Southwest Exp. Stn., Lamberton, MN 56152.Search for more papers by this author V. E. Comstock, V. E. ComstockSearch for more papers by this authorJ. H. Ford, J. H. Ford Professor and associate professor, Dep. of Agronomy and Plant Genetics, Univ. of Minnesota, St. Paul, MN 55108 and Southwest Exp. Stn., Lamberton, MN 56152.Search for more papers by this author First published: 01 September 1977 https://doi.org/10.2135/cropsci1977.0011183X001700050039xCitations: 2 1 Registered by the Crop Sci. Soc. Am. Cooperative investigations between Minnesota Agric. Exp. Stn. and ARS, USDA. AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat No abstract is available for this article.Citing Literature Volume17, Issue5September–October 1977Pages 823-823 RelatedInformation

Summary Two case histories are presented in which light stable isotope ratios (D/H and 18 O/ 16 O) place important constraints on the origins of ore-forming fluids in the Panguna porphyry copper deposit (upper Pliocene) and on the nature of the volcanic exhalative environment at Matupi Harbour, near Rabaul. At Panguna the overlap in δD values between local meteoric water and inferred primary magmatic waters poses problems in the interpretation of secondary biotite and sericite isotope data. The range of hydrogen and oxygen isotope ratios of the secondary biotites associated with the mineralized areas is essentially identical to those from other magmatic hydrothermal deposits, including porphyry copper deposits. The sericites from alteration haloes adjacent to mineralized quartz veins have δ 18 O values of 5.4 to 8.6‰ and δ D values of −61 to −77. A combination of thermodynamic and fluid inclusion techniques indicates that ∼500°C is a realistic average temperature for much of the mineralization-quartz veining-biotitization process. The isotopic composition of the fluids causing this mineralization and alteration was δ D⋍ −20 to −45‰ and δ 18 O ⋍ 6 to 7‰. If a meteoric water component existed at this stage of alteration, meteoric water/rock ratios were extremely small (less than 0.05 at %). Assuming that sericitization took place at temperatures down to 300°C, as suggested by the fluid inclusion data, the fluids responsible for this process had a composition of δ D = −30 to −50‰ and δ 18 O of ⋍ 3.5‰. These fluids probably would be largely of meteoric hydrothermal origin, produced by 18 O shifting of groundwaters during the formation of the propylitic zone and with a water/rock ratio of about 0.01 at % for the entire propylitic zone. Quartz δ 18 O values from veins associated with the different alteration assemblages increase away from intrusive centres, consistent with an outwards temperature decline, a decrease in δ 18 O content of associated water and a progressive increase in the meteoric water component associated with the later and (?) lower-temperature sericitization. There is no isotopic evidence to suggest that sea waters or connate waters formed a recognizable component of the hydrothermal system at any stage. Calculations with possible δ 18 O depletions of 0.5–1.0‰ in whole rocks from the Panguna region indicate that a meteoric leaching model for the genesis of the Panguna copper deposit is theoretically possible, but unlikely because of the small water/rock ratios. The area around Matupi Harbour includes the dormant volcanoes Rabalanakaia and Tavurvur, set in loosely consolidated, Quaternary ash deposits. Tavurvur last erupted in 1941 and 1942 and has since reverted to a quiet solfataric condition. D/H and 18 O/ 16 O ratios were determined on fumarole condensates, hot springs and meteoric waters. The data are grouped into distinct areas close to the meteoric water line and demonstrate that the thermal springs away from the shoreline are of meteoric origin and that sea water only enters the springs at the shoreline. If allowance is made for the vapour-liquid separation at the temperature of collection (100°C), the fumarole results from Tavurvur may be interpreted as steam separating from a water phase at ⋍ 100°C. The calculated water-phase isotopic compositions suggest that evaporation and possibly a small amount of mixing with sea water are involved. These conclusions are in conflict with those drawn from anion ratio and trace metal contents inferred by previous authors to be consistent with an hypothesis of modified sea-water origin. We contend that the chemistry is a reflection of the later history of these acid, mineralized, geothermal waters and does not necessarily give a correct picture of their ultimate origin. The markedly enhanced Fe, Mn and Zn values of the Matupi springs are purely a function of the leaching potential of geothermal fluids at elevated temperatures and of the chemistry of the porous rocks through which they pass.

AbstractApplication of high rates of [(4‐chloro‐o‐tolyl)oxy] acetic acid (MCPA) on four relatively homogeneous populations of flax (Linum usitatissimum L.) for seven successive generations and on two heterogeneous populations for three successive generations (F2, F2, and F4) caused no detectable genetic change in yield, oil content, iodine value, or maturity. Tolerance to MCPA was not increased by successive generation treatment with MCPA.The lack of detectable mutants in the progenies of flax populations sprayed with high rates of MCPA for several successive generations suggested that MCPA was not mutagenic. The frequency of mutations should not be increased as a result of successive applications of MCPA to commercially grown flax cultivars or to breeding populations.

Comparison of agronomic and seed quality characters of 17 near‐isogenic pairs of flax lines showed that the d locus was not associated with seed yield, maturity, height, or seed germination. Lines homozygous for the recessive d allele (yellow seed and pink flowers) had significantly smaller seed and higher iodine value than lines homozygous for the dominant D allele (brown seed and blue flowers). Percent oil of the two seed color classes differed significantly in each of four trials, but the differences were not consistent. High oil content was associated with the recessive allele in half the trials, but with the dominant allele in the other 2 trials. The analyses of variance strongly suggests that the chromosomal segment adjacent to the d locus is active in determining oil content and seed size, and that the d locus has a pleiotropic effect upon iodine value.

Crop ScienceVolume 9, Issue 4 cropsci1969.0011183X000900040052x p. 522-523 Registration of Crop Cultivars Registration of Norstar Flax1 (Reg. No. 30) V. E. Comstock, V. E. ComstockSearch for more papers by this authorJ. H. Ford, J. H. Ford Research Agronomists, Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture in Department of Agronomy and Plant Genetics, Univerrdty of Minnesota, St. Paul 55101.Search for more papers by this author V. E. Comstock, V. E. ComstockSearch for more papers by this authorJ. H. Ford, J. H. Ford Research Agronomists, Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture in Department of Agronomy and Plant Genetics, Univerrdty of Minnesota, St. Paul 55101.Search for more papers by this author First published: 01 July 1969 https://doi.org/10.2135/cropsci1969.0011183X000900040052x 1 Registered by the Crop Science Society of America. Cooperative investigations between the Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture, and Minnesota Agricultural Experiment Station. AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL No abstract is available for this article. Volume9, Issue4July–August 1969Pages 522-523 RelatedInformation

Crop ScienceVolume 8, Issue 5 cropsci1968.0011183X000800050050x p. 640-640 Registration of Crop Cultivars Registration of Nored Flax1 (Reg. No. 29) V. E. Comstock, V. E. ComstockSearch for more papers by this authorJ. H. Ford, J. H. Ford Research Agronomists, Crops Research Division, ARS, USDA, in Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul 55101.Search for more papers by this author V. E. Comstock, V. E. ComstockSearch for more papers by this authorJ. H. Ford, J. H. Ford Research Agronomists, Crops Research Division, ARS, USDA, in Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul 55101.Search for more papers by this author First published: 01 September 1968 https://doi.org/10.2135/cropsci1968.0011183X000800050050xCitations: 10 1 Registered by the Crop Science Society of America. Cooperative investigations between the Crops Research Division, Agricultural Research Service, U.S. Department of Agriculture, and Minnesota Agricultural Experiment Station. AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat No abstract is available for this article.Citing Literature Volume8, Issue5September–October 1968Pages 640-640 RelatedInformation

Progeny arising from crosses between 2‐methyl‐4‐chlorophenoxyacetic acid (MCPA)‐tolerant and MCPA‐susceptible flax varieties were evaluated for MCPA tolerance in F3, F4, BC(S2), and BC(S3) generations. Data were obtained on the change in anthocyanin production and stem curvature, delays to first bloom, full bloom, and maturity, and on the reduction of plant height andseed yield.Based on heritability estimates, selection would be most effective for change in anthocyanin production, stem curvature, and reduction in plant height in the ‘Arrow’ ✕ ‘Dakota’ cross and most effective for stem curvature, and delays to first bloom and to maturity in the Arrow ✕ C.I. 1139 cross.

Crop ScienceVolume 3, Issue 2 cropsci1963.0011183X000300020024x p. 171-172 Article Association Among Seed and Agronomic Characteristics in Isogenic Lines of Flax1 V. E. Comstock, V. E. ComstockSearch for more papers by this authorJ. H. Ford, J. H. FordSearch for more papers by this authorB. H. Beard, B. H. Beard Research Agronomists. Crops Research Division, ARS, USDA.Search for more papers by this author V. E. Comstock, V. E. ComstockSearch for more papers by this authorJ. H. Ford, J. H. FordSearch for more papers by this authorB. H. Beard, B. H. Beard Research Agronomists. Crops Research Division, ARS, USDA.Search for more papers by this author First published: 01 March 1963 https://doi.org/10.2135/cropsci1963.0011183X000300020024xCitations: 4 1 Contribution from the Crops Research Division, ARS, USDA, in cooperation with the Department of Agronomy and Plant Genetics, Minnesota Agr. Exp. Sta., Paper No. 4888, Scientific Journal Series, Minnesota Agr. Exp. Sta. AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat No abstract is available for this article.Citing Literature Volume3, Issue2March–April 1963Pages 171-172 RelatedInformation

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPesticide Residues, Determination of Cycloheximide (Acti-dione) Residues in CherriesG. C. Prescott, Harold Emerson, and J. H. FordCite this: J. Agric. Food Chem. 1956, 4, 4, 343–345Publication Date (Print):April 1, 1956Publication History Published online1 May 2002Published inissue 1 April 1956https://pubs.acs.org/doi/10.1021/jf60062a005https://doi.org/10.1021/jf60062a005research-articleACS PublicationsRequest reuse permissionsArticle Views43Altmetric-Citations6LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose Get e-Alerts

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTColorimetric Determination of ErythromycinJ. H. Ford, G. C. Prescott, J. W. Hinman, and E. L. CaronCite this: Anal. Chem. 1953, 25, 8, 1195–1197Publication Date (Print):August 1, 1953Publication History Published online1 May 2002Published inissue 1 August 1953https://doi.org/10.1021/ac60080a014RIGHTS & PERMISSIONSArticle Views208Altmetric-Citations42LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (340 KB) Get e-Alerts Get e-Alerts

The Hippo pathway was initially discovered in Drosophila melanogaster as a key regulator of tissue growth. It is an evolutionarily conserved signaling cascade regulating numerous biological processes, including cell growth and fate decision, organ size ...Read More

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydroxylamine Method of Determining PenicillinsJ. H. FordCite this: Anal. Chem. 1947, 19, 12, 1004–1006Publication Date (Print):December 1, 1947Publication History Published online1 May 2002Published inissue 1 December 1947https://pubs.acs.org/doi/10.1021/ac60012a018https://doi.org/10.1021/ac60012a018research-articleACS PublicationsRequest reuse permissionsArticle Views271Altmetric-Citations44LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose Get e-Alerts