Question 1
Measuring which of the following soil properties would provide a good indication of root penetration, air-filled pore space, and microbial activity in the soil?
◦ soil OM
◦ microbial biomass
◦ bulk density
◦ sodicity
Question 2
Michelle wants to increase rotation productivity on her farm by reducing pesticide use and ensuring that recovery of residual nutrients applied to the previous crop. Also, she prefers minimal initial investment on equipment and labor. Which of the following sets of agronomic principles would help her best in designing an effective crop rotation sequence?
◦ two-season interval between the same crop; livestock diversified farming; crops with high nutrient demand; variation in crop rotation sequence
◦ three-season interval between the same crop; vegetable crops for rotation; crops with high nutrient demand; variation in crop rotation sequence
◦ two-season interval between the same crop; vegetable crops for rotation; crops with slow germination and root growth; constant crop rotation sequence
◦ two-season interval between the same crop; livestock diversified farming; intensive tillage before planting; constant crop rotation sequence
Increase in rainfall on continents
British Output and Productivity Growth, 1760–1913
Effect of an Increase in gA,2 on Productivity and Output
Effect of Productivity Improvement in the Malthusian Model
Internal and external hip rotation
Reducing Radicals