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In contrast to ecosystems that are not harvested (e.g., native forest, grasslands), where in nutrientcycling is generally quite conservative, most agriculturalecosystems are net exporters of nutrients inherent in soil. Consider the following barley production system:-- Soilcontains 0.5% “available” Ca in the rooting zone to adepth of 50 cm.-- Soil bulkdensity is 1.20 g/cm3.-- Totalplant production (above ground biomass) is 5000 kg/ha/yr(dry-weight basis).-- Totalgrain yield is 2500 kg/ha/yr (dry-weight basis).-- Ca contentof the grain is 0.05%.-- Ca contentof the whole above ground plant is 1.5%.
1 ha = 10,000 m2a) If only the grain is removed fromthe field, how many years will the “available” Casupply in the soil last (assuming yields don’t decrease as Cacontent decreases)?b) If the entire barley plant isremoved, how long will the Ca last (same assumption as above)?c) Speculate upon and briefly discussimplications for barley straw and soil fertility management inlight of the results from a) and b) above.
q. mrs. gray a 50-year-old mother of seven children is complaining of dull aching pains in her legs. she reports that
A recessive mutant allele, black, causes a very dark body in drosophila when homozygous. The normal wild-type is described as gray. What F1 phenotypic ratio is predicted when a black female is crossed to a gray male whose father was black?
Determine if the bird is really foraging optimally an energy gathering sense. What aspects of its foraging behaviour would I need to know and measure order to calculate the net caloric gain for the foraging hummer?
If you look at photograph for a short time and then look awayfrom it, your trace memory of the image will
Explain how a mutation could inhibit the binding of sigma factor to DNA. Describe two specific base substitutions you think would inhibit the binding of sigma factor. Explain why you think your base substitutions would have this effect.
Select an environmental problem (the more specific the better) and design a scientific method to investigate in order to help find asolution. Focus on outlining the steps of the scientific methodrelative to the research you propose and using terms an..
you are the owner of a 100 employee retail dry goods store. you are located in a town where the major employer is an
q1. the new form of life is discovered. it has a genetic code much like other organisms except there are 5 dna bases
What are the steps in enzyme-substrate reaction. The enzyme most frequently study is bovine alkaline phosphatase. Alkaline phosphatase hydrolyze the artificial substrate p-nitrophenylphosphate (pNPP) giving us a way to create quantitative measu..
Compare and contrast the processes of replication and transcription. Be sure o include in the discussion a comparison of the purpose of the processes, the templates used in each process, when each process occurs, and the initiation and termination..
Which theme of biology explains the modification of an organism’s parts to adapt to its habitat?
Occasionally, subjecting a plant to photoflood and a fan will produce a lower rate of transpiration than exposing it solely to a photoflood. Why is alcohol effective against some viruses and not others?
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