Download or read book Response of Soybeans Glycine Max L Merrill to Soil Water Stress During Different Stages of Growth written by Clarence Johnson and published by . This book was released on 1973 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Duration of Water Stress at Different Growth Stages on Growth and Yield of Soybeans Glycine Max L Merrill written by Suwit Laohasiriwong and published by . This book was released on 1982 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Water Stress Timing in the Field on Growth Yield and Water Use Efficiency of Soybeans Glycine Max L of Varying Growth Habit written by Mohammad Reza Neyshabouri and published by . This book was released on 1982 with total page 484 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Response of Soybean glycine Max L merill to Irrigation Leels Soilmoisture Stress at Different Growth Stages a Simulation Approach written by S. Sridhara and published by . This book was released on 1992 with total page 193 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Plasticity of Soybean Glycine Max l Merrill Root Development Under Mild Water Deficits written by Yong He and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Drought is the major abiotic factor limiting soybean yield in the US. Under water deficit conditions, root systems may exhibit developmental plasticity resulting in morphological changes that extend the water-absorbing surface area of the roots. The objective of this study was to identify soybean genotypes which exhibit genetic diversity in root system developmental plasticity in response to water deficits, in order to enable physiological and genetic analyses of the regulatory mechanisms involved. Studies were conducted both at the seedling stage under precisely-controlled water deficits, and during three-week soil drying treatments of plants growing in 1.5 m-deep soil cylinders in controlled-environment chambers. Using the seedling system, 11 soybean genotypes selected from both domestic and Plant Introduction lines were studied. The results showed substantial genetic diversity in the capacity for increased lateral root development (number and total length of roots produced) and in the responses of overall root and shoot growth under water deficit conditions. Studies of the spatial and temporal patterns of lateral root development showed that the promotion of lateral root length under water deficit conditions was due to an increased root production rate rather than earlier initiation or promotion of root elongation. Genotypes with either superior or inferior root plasticity responses at the seedling stage were selected for more detailed studies using the deeper soil cylinder system with more mature plants. The results showed consistent genetic differences in lateral root developmental plasticity under water deficit conditions between the seedling and more mature plant systems.
Download or read book Yield and Development of Soybeans Glycine Max L as Affected by Irrigation with Municipal Wastewater and Well Water written by Michael J. Cordonnier and published by . This book was released on 1981 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Soybean Glycine Max L Merr Growth and Yield in Response to Blending Cultivars and Soil water Adjustment written by Percy Chisanga Simwanza and published by . This book was released on 1992 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Soil Moisture and Atmospheric Conditions on the Water Status of Soybean Plants Glycine Max L Merrill written by Cleber Morais Guimares and published by . This book was released on 1979 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two experiments were conducted in the field to study the effects of soil moisture and atmospheric conditions on the water status of soybeans. Leaf diffusive resistance at midday, and leaf water potential early in the morning and at midday correlated with soil moisture and atmospheric parameters. The atmospheric parameters studied were: solar radiation, potential evapotranspiration, pan evaporation and maximum air temperature. In addition leaf temperatures were correlated with leaf diffusive resistance. Atmospheric conditions explained the variations of non-stressed plants better than in the stressed plants in 1977 were explained better than in 1978. Probably factors associated with limited volume of soil, and different soil structure inside the soil containers used in 1978 were the reason for those variations of results. The highest yields were obtained from plants not stressed during the entire season. Treatments A (water stress initiated during the flowering), B (water stress initiated during early pod formation), and C (water stress initiated during later pod filling) reduced A and the control were the same. However, the seeds on plants of treatments B and C were significantly smaller. Stress applied during the late pod filling stage produced the smallest seeds. Information obtained from this experiment illustrated two points: (1) the importance of studying plant water status under natural environmental conditions, and (2) water stress during late pod filling is more deleterious on soybean yield than water stress imposed at any other stage.
Download or read book Effects of Various Planting Practices on Yields and Growth and Development of Soybeans Glycine Max L Merrill in Michigan written by David Warren Merck and published by . This book was released on 1980 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Plant Abiotic Stress and Responses to Climate Change written by Violeta Andjelkovic and published by BoD – Books on Demand. This book was released on 2018-05-23 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: Climate change is a serious problem influencing agricultural production worldwide and challenging researchers to investigate plant responses and to breed crops for the changed growing conditions. Abiotic stresses are the most important for crop production, affecting about 96.5% of arable land worldwide. These stress factors include high and low temperature, water deficit (drought) and flooding, salinity, heavy metals, UV radiation, light, chemical pollutants, and so on. Since some of the stresses occurred simultaneously, such as heat and water deficit, causing the interactions of physiological processes, novel multidisciplinary solutions are needed. This book provides an overview of the present state in the research of abiotic stresses and molecular, biochemical, and whole plant responses, helping to prevent the negative impact of global climate change.
Download or read book Response of Soyabean Glycine Max L Merrill Cultivers to Water Stress written by Prasad K. V. R. and published by . This book was released on 1988 with total page 99 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Water Stress Effects on Physiological Processes and Yield of Soybeans written by Mahmoud Fadl El Mula Ahmed and published by . This book was released on 1983 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: Soybeans [Glycine max (L.) Merr.] cv. Bragg were grown in field lysimeters for the study of water stress effects on certain physiological characteristics during different growth periods. A second objective was to study changes in plant water relations of well-irrigated soybeans during the growing season. Mid-day measurements were taken for soil water potential, leaf water potential components, stomatal diffusive resistence, transpiration, and leaf temperature. In well-irrigated plants, leaf osmotic potential began to decline with the onset of flowering, causing a considerable decrease in the leaf water potential. Mid-day turgor potential maintained hight values (5 to 8 bars) throughout the growing season. Diffusive resistence, transpiration rates, and leaf-to-air temperature differential (leaf temperature minus air temperature) were also constant util after R[indice]5, when diffusive resistance began to increase, transpiration rates decreased and temperature differential increased. This was related to plant aging as the crop approached the late reproductive growth stages. As estomatal diffusive resistance increased, transpiration cooling was less resulting in increased temperature differentials. During the drying cycles, leaf water potential componentes of the stressed plants were, in most cases, lower than teh control plants. Transpiration rates and stomatal conductance were also lower in the stressed plants while leaf-to-air temperature differential was greater. A high correlation was observed between osmotic potential and leaf water potential during drying cycles and was most likely associated with dehydration effect which resulted in increased concentrations of the osmotic components. However, osmotic potential at full turgor (leaf water potential equal to zero), showed progressive decreases during the season, giving values of -9.4, -10.9, -11.6 and -15.1 bars at V[indice]5, R[indice]1, R[indice]5 and R[indice]6 stages, respectively. This reflects changes in osmotic potential of soybeans as they grow from vegetative to reproductive phases. The slope of [phi][indice][pi] versus [phi][indice]L also declined from 0.437 at V[indice]5 to 0.233 at R[indice]6, suggesting reduced plasticity during late reproductive stages. Moisture strees during R[indice]6 resulted in significant diferences in harvest index, 100-seed weigth, percent empty pods, and shelling percentage as compared to the well-watered control. No significant differences in seed yield were observed; however, the data suggests yield reductions of 12%, 13% and 14% due to water withholding during V[indice]5, V[indice]5 plus R[indice]5, and R[indice]6 growth periods, respectively.
Download or read book Effects of soil moisture and atmospheric conditions on the water status of soybean plants Glycine max L Merrill written by C. M. Guimaraes and published by . This book was released on 1979 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt: The dynamics of the plant water balance. Plant water potencial. Leaf diffusive resistance. Atmosphere and plant water status. Effects of water deficits on plant growth. Water stress at different growth stages of plants.
Download or read book Physiological and Developmental Responses of Normal and Dense Pubescent Soybeans Glycine Max L Merr to Water Stress written by Gandoul I. Gandoul and published by . This book was released on 1995 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Response of Soybean Glycine Max L Merrill to Irrigation Schedules and Phosphorus Levels in Black Soils During Summer written by HARADAGATTI SOMANNA S and published by . This book was released on 1996 with total page 145 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Water Stress Morphological and Anatomical Changes in Soybean Glycine Max L Plants written by Phetole Mangena and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Water stress is one of the most important physiological stress factors that adversely affect soybeans in many critical aspects of their growth and metabolism. Soybean's growth, development and productivity are severely diminished, when soil or cell water potential becomes inadequate to sustain metabolic functioning. However, little has been done to gather comprehensive information regarding the specific changes that occur in water-stressed plants at the anatomical and morphological level. In this study, deviations in root growth, shoot growth, stomatal conductance, yield components and anatomical features are reported. Treatments with two levels of water stress imposed by reducing irrigation (once in 7 days or once in 15 days) revealed that, all cultivars (Dundee, LS 677, LS 678, TGx 1740-2F, TGx 1835-10E and Peking) were highly susceptible to prolonged water stress, exhibiting severe dehydration and death. A 15.0 and 30.0% survival frequency was obtained in plants irrigated once in 7 days; LS 677 and Peking, respectively. Unlike many other stresses, water deficit did not only affect the density of stomata, but, photosynthesis was affected by the lower levels of tissue CO2. These results suggest that, balanced biochemical, physiological, anatomical and morphological regulations are necessary for increased growth and yields in soybean.
Download or read book A Genotypic Comparison of Plasticity of Root System Development During Soil Drying in Soybean Glycine Max L Merrill written by Tracy Cottle Scanlan and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Water deficit is responsible for significant losses in soybean (Glycine max (L.) Merrill) yield under dryland conditions. Under drought, increases in root depth and density, i.e., developmental plasticity, enable plants to sustain high rates of water extraction and help to maintain yield (O'Toole and Bland, 1987; Sponchiado et al., 1989; White and Castillo, 1989). The objective of this project was to screen and identify soybean lines exhibiting diversity in root system characteristics that are associated with drought tolerance, in order to enable physiological and genetic analyses of the regulatory mechanisms involved. A genetically diverse collection of soybean genotypes was selected for screening. To evaluate root plasticity in response to soil drying, an experimental system that allowed spatial and temporal monitoring of root proliferation was developed. Plants were grown in soil columns 1.5 meters in depth, and subjected to soil drying for three weeks. The vertical distribution of root development was monitored photographically at weekly intervals, and plants were harvested at the end of the experiments for taproot length and shoot biomass. In nine genotypes tested under greenhouse conditions, final taproot length ranged from 98% to 150% of well-watered controls. Genetic variation in the response of rooting density to drought was also demonstrated. However, comparison between genotypes was complicated by variation in leaf area development and, as a result, in rates of soil drying and plant stress development, as well as by seasonal variation in the greenhouse environmental conditions. Therefore, growth chamber studies which allowed equivalent rates of soil drying between two selected genotypes were conducted. These studies demonstrated that under equivalent rates of soil drying, insignificant differences in the response of rooting density to drought between the two genotypes were observed.
