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T1 - The seed and soil hypothesis

When humans began to raze forests and use the resultant soils to raise crops, they were working their way down through the food chain, no longer harvesting ecosystem detritus but destroying entire ecosystems literally at their roots for short-term human benefit. That practice eventually turned forest ecosystems into deserts. As this essay will survey, that was a rampant problem in all early civilizations. Eventually, humans learned to reach even further back into the ecological horizon as they began burning energy stores that were hundreds of millions of years old; was first and second. They were burned a million times as fast as they were created. In all instances, humans were releasing sunlight energy that had been captured and stored by organisms. In the 20th century, when humans began using nuclear fission, they were going even further back in time and harvesting energy stored via billions of years ago. With each new energy source, humans were harvesting older, more concentrated energy sources, which released far more energy than the previously used source. In each instance, humans plundered the energy source to exhaustion. Humans have not lived in “harmony” with nature since they learned to control fire.

Investigate how planting depth of seeds affects their rate of emergence from the soil.

"Hypothesis" means, "what do you expect to happen in your experiment?" Suppose your research question is, "How will different liquids affect plant growth?" The hypothesis might be, "Soda will make the plant grow tallest because plants need carbon dioxide to live."

However, the seeds in the potting soil are very strong and healthy.

Coronary artery disease (CAD) is a multifactorial disease wherein hereditary and environmental factors play a major role. Our hypothesis is that an individual’s genetic profile functions as soil while various environmental factors such as physical inactivity, smoking, stress, etc. act as seeds in the etiopathogenesis of CAD. Much of the information regarding genetic and environmental factors can be determined in a pedigree chart by taking a history of the index patient, including details of major risk factors such as age, sex, smoking, hypertension, diabetes, coronary artery disease and stroke in the family[]. Preparing such a chart is a cost-effective way of initiating primary preventive measures in patients in a developing economy. We report herein an illustrative pedigree chart which exemplifies our above hypothesis.

It is important to word your hypothesis correctly so that it is measurable. For example, soda helps seeds grow better is not measureable because better cannot be measured. What makes something better? One person might think that seeds grow better if they grow tall. Another might disagree and say that better growth means more leaves than other plants. Decide on a hypothesis can be proved in a measureable way. For example, "Using soda to provide liquid to a plant will cause the plant to grow taller."

The Seed and Soil Hypothesis Revisted - [PDF Document]

N2 - Spatial variation in species composition within and among communities may be caused by deterministic, niche-based species sorting in response to underlying environmental heterogeneity as well as by stochastic factors such as dispersal limitation and variable species pools. An important goal in ecology is to reconcile deterministic and stochastic perspectives of community assembly and to assess the contribution of each class of processes to community dynamics and structure. We present an 8-year field experiment of grassland secondary succession that documents plant community differentiation in response to an experimental gradient of nitrogen (N) fertilization, factorially crossed with a manipulation of the available species pool achieved using a multi-species seed sowing treatment. We evaluate the hypothesis, adapted from meta-community theory, that seed availability limits the contribution of niche-based, species sorting to patterns of community variation along an environmental gradient. The magnitude of species sorting and community differentiation observed in response to N fertilization (measured as N effect size on multivariate community composition) became progressively more distinct and more statistically significant over time in experimental plots as succession proceeded. However, this response was significantly more pronounced among plots that had been exposed to experimentally enriched propagule pools. Synthesis. Our findings support the hypothesis that dispersal limitations and species pools can mediate the contribution of niche-based, species-environment sorting to plant community development and limit the extent to which underlying resource gradients become deterministically expressed in patterns of vegetation composition. We suggest that continued habitat destruction and fragmentation in the former prairie landscape where this study was conducted would further reduce native species pools and habitat connectivity, diminishing opportunities for species-environment sorting and compromising the capacity of these grassland systems to respond to environmental change.

AB - Spatial variation in species composition within and among communities may be caused by deterministic, niche-based species sorting in response to underlying environmental heterogeneity as well as by stochastic factors such as dispersal limitation and variable species pools. An important goal in ecology is to reconcile deterministic and stochastic perspectives of community assembly and to assess the contribution of each class of processes to community dynamics and structure. We present an 8-year field experiment of grassland secondary succession that documents plant community differentiation in response to an experimental gradient of nitrogen (N) fertilization, factorially crossed with a manipulation of the available species pool achieved using a multi-species seed sowing treatment. We evaluate the hypothesis, adapted from meta-community theory, that seed availability limits the contribution of niche-based, species sorting to patterns of community variation along an environmental gradient. The magnitude of species sorting and community differentiation observed in response to N fertilization (measured as N effect size on multivariate community composition) became progressively more distinct and more statistically significant over time in experimental plots as succession proceeded. However, this response was significantly more pronounced among plots that had been exposed to experimentally enriched propagule pools. Synthesis. Our findings support the hypothesis that dispersal limitations and species pools can mediate the contribution of niche-based, species-environment sorting to plant community development and limit the extent to which underlying resource gradients become deterministically expressed in patterns of vegetation composition. We suggest that continued habitat destruction and fragmentation in the former prairie landscape where this study was conducted would further reduce native species pools and habitat connectivity, diminishing opportunities for species-environment sorting and compromising the capacity of these grassland systems to respond to environmental change.

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Seed soil hypothesis | omminowithbifasleasovotbokef

Coronary artery disease (CAD) is a multifactorial disease wherein hereditary and environmental factors play a major role. Our hypothesis is that an individual’s genetic profile functions as soil while various environmental factors such as physical inactivity, smoking, stress, etc. act as seeds in the etiopathogenesis of CAD. Much of the information regarding genetic and environmental factors can be determined in a pedigree chart by taking a history of the index patient, including details of major risk factors such as age, sex, smoking, hypertension, diabetes, coronary artery disease and stroke in the family. Preparing such a chart is a cost-effective way of initiating primary preventive measures in patients in a developing economy. The advantage of a detailed pedigree chart is to provide a snapshot view of the evident and underlying risk factors in the family as a whole, and not to merely study conventional risk factors. It elucidates the hidden stressors and hereditary factors responsible for cardiovascular disease in the family. We report herein an illustrative pedigree chart which exemplifies our above hypothesis.

The seed and soil hypothesis : Vascularisation and brain ..

The Targum of Jonathan fixes this time to the fourteenth of Nisan, as if it was the time of the passover, a feast instituted two thousand years after this time, or thereabout; and very stupidly one of the Jewish writers (d) observes, that"the night of the feast of the passover came, and Adam said to his sons, on this night the Israelites will bring the offerings of the passovers, offer ye also before your Creator." That Cain brought of the fruit of the ground an offering unto the Lord; corn, herbs, seeds, &c.

Seed and soil hypothesis by Jennifer Peel - issuu

the Targum of Jonathan says it was flax seed; so Jarchi makes mention of an "agadah" or exposition, which gives the same sense; and another of their writers (e) observes, that Cain brought what was left of his food, or light and trifling things, flax or hemp seed.

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