By Roger G. Petersen
This article presents statistical and biometrical strategies for designing, engaging in, examining and analyzing box experiments. It addresses an important study issues in agriculture, together with agronomy, breeding and pasture trials; farming platforms study; and intercropping examine.
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Extra resources for Agricultural Field Experiments
With manure, intestinal fluids, urine, dirt, hair). , inedibles, entrails, hides). Going to the bathroom. Blowing your nose; sneezing or coughing into your hand. Switching species of meat or carcasses. , sanitizers, cleaners, disinfectants). Any sink that can be operated without hands, in this case with foot pedals, makes an ideal hand-washing station. An automatic soap dispenser would make it even better. indd 32 11/7/13 11:17 AM Preventing the Spread of Pathogens Hands that have open wounds should be cleaned thoroughly, bandaged, and then covered with latex or nitrile gloves.
For some bacteria, incubation can take as little as a couple of hours; for hepatitis, a common viral foodborne pathogen, the average incubation period is 28 days. While many pathogens operate uniquely, they generally reproduce under similar conditions: warm temperatures, ample access to nutrients, and a slightly acidic pH. Both cooked and raw foods can provide the right nutrients and an acceptable pH condition, so the real variable for microbial growth on food is temperature. The range of temperatures that pathogens can actively persist in, often referred to as the “danger zone,” is between 40ºF and 140ºF.
These include spoilage bacteria as well as the plethora of pathogens that may already be on the food but in benign numbers. The pathogens that are affected by cold temperatures are bacteria and parasitic worms. Bacteria are prolific at temperatures above 40ºF; their multiplication rate increases with the temperature until the heat becomes high enough to kill them, which is usually around 140ºF. This is the basis of the so-called danger zone: perishable foods left exposed in temperatures of 40º to 140ºF for extended periods will undoubtedly spoil and increase the risk of dangerous infection.
Agricultural Field Experiments by Roger G. Petersen