(20 pts) Overfertilization with N is inefficient, resulting in unnecessary costs to growers and substantial environmental impacts. Using the concept of nutrient recovery and a yield optimum at 150 kg N ha-1, describe with words how yield, N uptake and N losses via leaching evolve as a function of N inputs, up to 250 kg N ha-1. In your description, you should also mention the shape of the relationships (e.g., linear, plateauing, exponential, etc.).

Most of a soil’s phosphorus is generally not found as phosphate anions in soil solution, but rather associated with different soil pools. Which of the following pools is not important for phosphorus removal from soil solution?

A. (10 pts) Soil health is the capacity of soil to function as a living ecosystem. Describe how soil organic matter/carbon can impact biological, chemical, and physical soil functions/processes (describe one function/process for each, so three in total). B. (10 pts) Soil fertility is the capacity to support plant productivity. Describe how two of the functions/processes described above for SOM impact soil fertility.

A. (10 pts) Describe two key practices that distinguish organic from conventional agriculture, including one related to nutrient management. B. (10 pts) Compare how yields and environmental impacts (expressed per unit of area vs. per unit of productivity) differ between the two types of agricultural systems.

reaeraer

Identify the greatest source of energy in the United States.A) petroleumB) natural gasC) waterD) coalE) nuclear power

Use the standard reaction enthalpies given below to determine ΔH°rxn for the following reaction:     2 S(s) + 3 O2(g) -> 2 SO3(g) ΔH°rxn = ?   Given:    SO2(g) -> S(s) + O2(g)  ΔH°rxn = +296.8 kJ    2 SO2(g) + O2(g) -> 2 SO3(g) ΔH°rxn = -197.8 kJ    A) -494.6 kJ  B) -692.4 kJ  C) -791.4 kJ  D) 1583 kJ  E) -293.0 kJ

 The energy that is associated with the position or composition of an object is calledA) kinetic energyB) thermal energyC) potential energyD) chemical energy

Describe the concept of Orthodoxy vs. Orthopraxy when comparing religions. Give an example of how and why orthodoxy influences religious practice, and one example of how orthopraxy influences religious practice.

How much energy is required to decompose 765 g of PCl3, according to the reaction below? The molar mass of PCl3 is 137.32 g/mol and may be useful.            4 PCl3(g) → P4(s) + 6 Cl2(g)    ΔH°rxn = +1207 kJ A) 2.31 × 103 kJB) 4.33 × 103 kJC) 6.72 × 103 kJD) 1.68 × 103 kJE) 5.95 × 103 kJ