Crop Yields Quiz

Which type of crops benefit most from increased CO₂ levels?

• C4 crops like maize

• C3 crops like wheat and rice

• All crops benefit equally

• No crops benefit from increased CO₂

What is a potential positive effect of climate change in high-latitude regions?

• Increased rainfall

• Longer growing seasons

• Fewer pests

• Less extreme weather events

By how much could maize yields be reduced during a week of temperatures above 35°C during flowering?

• 10%

• 25%

• 40%

• 60%

Which crop is expected to be most negatively affected by climate change?

• Wheat

• Rice

• Maize

• Soybeans

What effect can waterlogging have on wheat yields?

• 5-10% reduction

• 15-20% reduction

• 25-35% reduction

• 50-60% reduction

What is the typical fertiliser application rate in Sub-Saharan Africa?

• 5-10 kilograms per hectare

• 50-60 kilograms per hectare

• 100-150 kilograms per hectare

• 300-400 kilograms per hectare

What is a sign of good Nitrogen Use Efficiency (NUE)?

• Values below 40%

• Values between 60-80%

• Values above 100%

• Values between 10-20%

In China's large-scale fertiliser study involving 21 million farmers, nitrogen fertiliser use decreased by:

• 5%

• 10%

• 16%

• 25%

What is a problem with using too much fertiliser?

• Plants become too tall

• Water pollution

• Seeds germinate too quickly

• Soil becomes too alkaline

What is precision farming primarily used for?

• Reducing labor costs

• Increasing farm size

• Applying fertiliser exactly where it's needed

• Improving crop market prices