For each 1°C increase in temperature, plants need 2 mm additional precipitation to maintain a healthy water balance; i.e. PET = 2 xT (°C). For an ecosystem with a mean monthly temperature of 30°C, receiving 40 mm/ month precipitation, which of the following statements is most likely true? There is a water surplus and AET = PET. There is a water surplus and AET < PET. There is a water deficit and AET = PET. There is a water deficit and AET < PET.
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- Fertilization & deposition Crop export Watershed Leaching & Runoff Mineralization The figure above shows major N inputs and outputs for a watershed dominated by corn/soybean production. Given an annual change in N storage of 1200 Mg yr for the watershed, calculate the rate of leaching & runoff. To answer this question, assume also the following rates (in Mg yr): fertilization & deposition = 4000; mineralization = 4900; and crop export = 5400. %3! Your Answer: AnswerState three conditions that lead to very low water application efficiency in most lowland rice farmsFigure 46.8 Why do you think the value for gross productivity of the primary producers is the same as the value for totall heat and respiration (20,810 kcal/ m2/yr)?
- As a rule of thumb, each 1% of soil organic matter by weight contains about 1,000 pounds of nitrogen in the plow layer. For a plow layer with 2% soil organic matter, one can expect the amount of N to be mineralized per growing season to equal about: over 120 pounds less than 10 pounds 15 pounds 120 pounds 40 poundsEthanol from sugarcane has a medium net energy yield, while ethanol from corn has a low net energy yield. Why might this be the case? The energy input for growing corn is lower than that for sugarcane. The energy input for growing sugarcane is lower than that for corn. The EROI for corn ethanol is higher than that for sugarcane. The net energy ratio of corn ethanol is negative. Corn ethanol is not a renewable energy source.Which of the following are true about irrigation? Select all that apply 1. It requires sunlight to be beneficial 2. It helps to saturate the land 3. It depletes the groundwater supply 4. It prevents farmers from replying on rainfall
- what would the biotic factors be in livestock production and how do they affect the followings:1- reproduction and milk yield in cattle breeding 2- reproduction and growth in sheep breeding mention some details.productivity in above-ground biomass increment is greater in the estuarine stand than the island fringing stand productivity in litterfall is greater in the estuarine stand than the island fringing stand O productivity can be measured in part by measuring carbon in litterfall O productivity can be measured in part by measuring carbon in above-ground biomass increment subtracting above-ground biomass increment from litterfall provides the total productivity for a mangrove standWhich of the following statements about nutrient inputs and eutrophication is FALSE? O Fossil fuel combustion (e.g. burning gasoline, coal) releases nitrogen which contributes to eutrophication The production of chemical farm fertilizers through industrial fixation of N, is a major source of bioavailable nitrogen and cause of eutrophication O The mining of phosphate rock for fertilizers is a major source of bioavailable phosphorus and cause of eutrophication O Eutrophication can cause oxygen depletion in aquatic systems by increasing the growth of algae which consume a lot of oxygen The production of livestock at large-scale (which generates a lot of manure) can be a cause of eutrophication
- AP Environmental Science Primary Productivity Problems Net Primary Productivity efficiency can be calculated for terrestrial producers when values for insolation energy, respiration loss and gross productivity are known. Use the equations below to answer the following problems: Net Primary Productivity = Gross Productivity – Respiration Loss Efficiency = . NPP . X 100 Insolation Energy In a rice paddy in Southeast Asia, the insolation energy is 6,000,000 calories/m2/day. The gross productivity of the rice is 0.012 grams/cm2/day, and the respiration loss is 20 percent. One gram of rice is equivalent to 1000 calories. Calculate the net primary productivity of the rice. Find the efficiency of photosynthesis by the rice. Could you mostly help me set it up and find it? So I can learn how to do it.The Philippines has long been facing different problems in the sector of agriculture. Cite two real-life scenarios/situations where you can see or observe the impacts of abiotic and biotic factors on crop production in the country (PH) . In what ways can you manage these factors to ensure agricultural productivity? (be as specific in giving abiotic/biotic stresses in real life example)Phosphorus immobilization occurs when: O a plant absorbs phosphorus from the soil, and converts it into ATP phosphate rich rock undergoes weathering, releasing biologically-available phosphorus into the environment O a coyote dies, and as it decomposes, it releases phosphorus back into the environment