Download or read book Influence of Soil Temperature and Moisture on Penetration Development and Reproduction of Heterodera Glycines in Soybean written by Mustapha Chelbi and published by . This book was released on 1984 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Masters Theses in the Pure and Applied Sciences written by Wade H. Shafer and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 407 pages. Available in PDF, EPUB and Kindle. Book excerpt: Masters Theses in the Pure and Applied Sciences was first conceived, published, and disseminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS) * at Purdue University in 1 957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the activity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all con cerned if the printing and distribution of the volumes were handled by an interna tional publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Cor poration of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 29 (thesis year 1984) a total of 12,637 theses titles from 23 Canadian and 202 United States universities. We are sure that this broader base for these titles reported will greatly enhance the value of this important annual reference work. While Volume 29 reports theses submitted in 1984, on occasion, certain univer sities do report theses submitted in previous years but not reported at the time.

Download or read book The Influence of Soil Temperature and Soybean Phenology on Dormancy Induction of Heterodera Glycines written by Nancy Sherwood Hill and published by . This book was released on 1985 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Southern Cooperative Series written by and published by . This book was released on 1943 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Variability and Population Dynamics of Root knot and Cyst Nematodes in the Southern Region of the United States written by Donald Peter Schmitt and published by . This book was released on 1989 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Influence of Photoperiod Temperature and Soil Moisture on the Growth and Development of Williams Soybeans written by Rafael A. Gimenez and published by . This book was released on 1983 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Pesticides Documentation Bulletin written by and published by . This book was released on 1968 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Soil Physical Conditions and Nitrogen Fixation of Soybeans Glycine Max Merrill Var Chippewa 64 written by Tsungmin Kuo and published by . This book was released on 1970 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effect of soil water suction and soil temperature on rates of transpiration, photosynthesis, respiration and nitrogen fixation of soybean (Glycine max. Merrill, var. Chippewa 64) seedlings was studied. A special apparatus was developed in which the soil water suction of several cells with soybeans growing in them could be maintained independently at a selected temperature. Transpiration was determined by a constant-water level device which recorded the amount of water used over a period of time. Photosynthesis and respiration were measured using an infra-red gas analyzer. The total nitrogen content of plants was measured by the micro-Kjeldahl method at the beginning and end of a ten-day experimental period. Leaf surface areas were determined with an air flow planimeter. In general with increasing soil temperature rates of transpiration, photosynthesis, and nitrogen fixation increased slowly at first and then rapidly until a certain optimum range was reached and decreased at higher temperatures. Maximum rates occurred around soil temperatures, of 30, 27 and 27°C, respectively. The rate of respiration also increased with increasing soil temperature until an optimum range around 27°C was reached and then dropped rapidly as the soil temperature further increased. Rates of photosynthesis, respiration, transpiration and N-fixation decreased steadily with increasing soil water suction. The decrease in the rate of these metabolic processes with increased soil water suction was attributed to effects of changes in viscosity and root cell permeability, stomatal movement and translocation of metabolic substrates. At low soil temperatures the dry matter accumulation seemed to be controlled by the water supply. At higher than optimum soil temperatures the dry dry matter accumulation was very sensitive-to temperature changes and less soil water dependent. When the nitrogen supply from the soil is limiting, the nitrogen fixation may possibly be a most important factor in the metabolic processes and thus the growth of leguminous plants. It is obvious that for such a plant, soil water availability, soil temperature and nodule rhyzobium organism-plant relationships are important.

Download or read book The Effect of the Soybean Gene Rhg1 on Reproduction of Heterodera Glycines in the Field and Greenhouse and Associated Effects on Agronomic Traits written by Eric Alan Brucker and published by . This book was released on 2004 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effects of the Rhg1 Gene on Resistance to Heterodera Glycines in Soybean Glycine Max written by Yuhong Li and published by . This book was released on 2003 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book An Investigation of Heterodera Glycines Populations on Resistant Soybean written by Alison Lee Colgrove and published by . This book was released on 2004 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: The development of the soybean cyst nematode, Heterodera glycines, on resistant soybean was investigated in three separate studies: (1) the effect of soybean resistance on field populations of H. glycines ; (2) the effect of resistant soybean on males of H. glycines populations; and (3) a molecular analysis of H. glycines development on resistant soybean and sex determination. The response of field populations to consistently planted resistant soybean was observed to determine if H. glycines race test results are reliable indicators for future population changes. Results suggested that race test results are highly variable and of questionable value for forecasting. Variability of sex ratios on resistant soybean was investigated in inbred lines of H. glycines in which reproduction of females is consistent in an attempt to characterize resistance effects on H. glycines males. Results suggested that the lower requirements for male survival under stressful host conditions and not environmental sex determination mechanisms were associated with higher male numbers. A molecular analysis of inbred lines of H. glycines compared the DNA of lines with different levels of development on resistant soybean and males and females in an attempt to identify genetic markers for virulence and genetic differences between males and females. Polymorphisms found between virulent and avirulent lines are useful to characterize H. glycines development on resistant soybean.

Download or read book Dormancy of Heterodera Glycines in Missouri written by Jyh-herng Yen and published by . This book was released on 1995 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt: A two-year study was conducted in field microplots to determine the relative importance of soybean phenology and soil temperature on the induction of dormancy in soybean cyst nematode, Heterodera glycines. Infested microplots were planted with near-isogenic soybean lines (selections from 'Clark') differing for date of maturity. Eggs of H. glycines, extracted from cysts collected monthly from each microplot, were used in hatching tests and bioassays to determine dormancy. Egg-hatching and J2-infectivity rates decreased beginning in July, indicating dormancy induction. Hatching rates were not related to soil temperature, and did not differ consistently among soybean isolines. The monophasic changes in all nematode responses (hatching, infectivity, and reproduction) with peak mid-summer rates suggest that H. glycines produces one primary generation per year under central Missouri conditions. Changes in hatching rates and the timing of minimum and maximum rates suggested that H. glycines eggs exhibit more than one type of dormancy. Trehalose accumulation occurs during dormancy induction in other nematode species, and its use as a marker for dormancy of H. glycines was investigated in a two-year field microplot experiment. Changes in the glucose, trehalose, total protein, and glycogen contents og eggs retained within cysts were monitored monthly. Trehalose accumulation was highly negatively correlated with soil temperature. Thus, trehalose accumulation is not a useful marker for dormancy in contrast to dormancy induction, which was temperature-independent.

Download or read book Effect of Soybean Products and Other Host Products on Hatch of the Soybean Cyst Nematode Heterodera Glycines Ichinohe written by Mary Elizabeth Moberg and published by . This book was released on 1999 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book In field Variation for Soybean Emergence and Development written by Travis C. Belt and published by . This book was released on 2004 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this study was to evaluate the effects of soil and landscape characteristics on soybean [Glycine max (L.) Merr.] emergence, development, and yield. Effects of soil and landscape characteristics, as measured by EC a and DEM data, on soybean emergence and yield as well as soybean NDVI, as measured by a multispectral radiometer, were measured near Columbia, MO in 2001 and 2002. Two planting dates and seeds treated with or without a fungicide were used in an attempt to provide variation for soil temperature, moisture, and disease pressure during emergence. Early planting dates delayed emergence and decreased emergence percentage in both years. Lower initial populations for the early planting dates also resulted in lower NDVI readings, shorter heights at R7, and greater change and relative change of NDVI. Only when planting date drastically affected emergence percentage did planting date affect yield. The seed treatment with a fungicide increased both emergence percentage and yield but only for the 4 May 2002 planting date. Forward stepwise linear regression analyses produced several significant models using EC a and DEMs, but were quite variable and differed depending on weather conditions associated with planting dates and years. (Abstract shortened by UMI.).

Download or read book Evaluation of Heterodera Glycines Macrophomina Phaseolina Interactions on Soybean written by Horacio Daniel Lopez Nicora and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: oth Heterodera glycines, the soybean cyst nematode, and the fungus Macrophomina phaseolina, the causal agent of soybean charcoal rot, are damaging soil-borne pathogens. Many studies have been conducted to understand the individual effect of each pathogen on soybean. Little is known, however, of the effect when both soil-borne pathogens co-infest soybean fields. We examined this effect in three different studies. The first was a survey to determine the distribution and abundance of both pathogens in agricultural fields across Ohio. Soil samples were collected from soybean fields; H. glycines and M. phaseolina were extracted and quantified from each soil sample. More than 77% of the samples tested positive for the presence of both pathogens. Surprisingly, over 75% of the growers with H. glycines infested fields were unaware they had this problem. Information on the distribution and abundance of these pathogens in Ohio is extremely useful for alerting growers of potential yield reduction and recommending integrated pest management. In the second study, fields with different levels of each pathogen were identified during three growing seasons. From each field, soybean yield and abundance of H. glycines and M. phaseolina were obtained and used in a spatial regression analysis. We evaluated the effect of each pathogen and their interaction on soybean yield. Based on spatial regression analysis there was a significant interaction effect between H. glycines and M. phaseolina on soybean yield for fields with high initial inoculum. Observations from these fields helped us design the third study in which we expanded on basic nematology and plant pathology techniques, and used plant genetics to evaluate and better understand the field biology of these soil-borne pathogens. Experiments were conducted in the greenhouse and in two fields infested with H. glycines (HG) Type 2.5.7 and M. phaseolina in 2013 and 2014, respectively. Soybean lines developed through four backcrosses (BC4) were used; half of the lines were predicted to have the H. glycines resistance allele at Rhg1 from PI 88788 based on a linked genetic marker and the other half did not have the resistance marker. In a split-plot experimental design, soybean genotypes were planted in adjacent plots, one with M. phaseolina added pre-plant and the other without. Soybean yield reduction took place with increasing levels of H. glycines initial population in both fields. In addition, soybean emergence in plots infested with M. phaseolina was reduced by over 10% and 35% compared with uninfested plots in the 2013 and 2014 field experiments, respectively. Results from these studies showed that the marker alleles of lines for Rhg1 and the greenhouse studies reliably predicted the response of soybean lines to HG Type 0 and HG Type 2.5.7. In the field studies, however, the response of these lines to HG Type 2.5.7 was dependent on H. glycines initial population. Environmental conditions in 2013 and 2014 were not conducive for the development of charcoal rot and the disease did not develop. The findings of these projects will help improve integrated pest management recommendations to growers for sustainable crop production.

Download or read book Soil Moisture Stress Effects on Soybean Vegetative Physiological and Reproductive Growth and Post harvest Seed Physiology Quality and Chemical Composition written by Chathurika Wijewardana and published by . This book was released on 2018 with total page 219 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the increasing scarcity of water resources, soil moisture stress is the single most threat to global soybean production causing extensive yield losses. The objectives of this study were to investigate soil moisture stress effects on all aspects of soybean growth and development processes and to develop functional algorithms that could be used for field management decisions and in soybean crop modeling. To fulfill these objectives, six experiments were conducted; one in vitro osmotic stress study on seed germination, four studies by imposing five soil moisture treatments, 100, 80, 60, 40, and 20% of daily evapotranspiration of the control at different growth stages using sunlit plant growth chambers, and one transgenerational study on seed germination at different osmotic levels and offspring growth at three irrigation treatments (100, 66, and 33% based on field capacity) for plants grown at different soil moisture levels. Two cultivars from maturity group V, Asgrow AG5332 and Progeny P5333RY, with different growth habits were used in all these studies. Midday leaf water potential, plant height, mainstem nodes, gas-exchange traits, canopy reflectance, and several yield components including pod weight, seed yield, and seed quality were measured. Soil moisture stress decreased biomass, net photosynthesis, yield, individual seed weight, maximum seed germination, protein, fatty acids, sucrose, N, and P and increased oil, stachyose, Fe, Mg, Zn, Cu, and B contents. Overall, Asgrow AG5332 was more tolerant to drought stress than Progeny P5333RY. Soil moisture stress induced changes in seed quality that were correlated with seed germination and seedling vigor in the F1 generation. These data can be used to build a model-based decision support system capable of predicting yield under field conditions.

Download or read book The Effect of Seed Quality Soil Temperature and Soil Moisture on Field Emergence of Soybeans Glycine Max L Merr written by Jerry Lee Hatfield and published by . This book was released on 1972 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt: