Question

crop rotation
the practice of rotating use of different fields from crop to crop each year, to avoid exhausting the soil.
applies to plants and animals (cows, etc)
pros

• fixation (beans and legumes) naturally replenish soil nutrients
• different types of crops use different nutrients

cons

• need to replant/change layout

intercropping
the practice of growing two or more different crops at the same time on a plot.
ex. a carbohydrate - rich grain that depletes soil nitrogen and a protein - rich legume that adds nitrogen to the soil
pros

• use more efficiently
• grow a greater variety of crops
• no need to rotate crops

cons

• harder to harvest on a large scale

companion planting
the practice of planting specific plant together to help deter insects or to attract insects away from crops of interest
pros

• plants do the work \each other\

cons

• need to know what crops grow well together and which ones to avoid

trap crop
a plant that agricultural pests (usually insects) away from nearby crops
pros

• insects wont get to main crop

cons

• need to take time and space to plant a crop you wont

Explanation:

Step1: Analyze the context of each blank

For the first blank in "Crop Rotation", it's about a process related to beans and legumes replenishing soil nutrients. Nitrogen - fixation is a key process here.
For the second blank in "Intercropping", since it's about using something more efficiently and considering the context of land and crops, "space" makes sense.
For the third blank in "Companion Planting", the phrase "help each other" is common in such contexts.
For the fourth blank in "Trap Crop", the function is to draw pests away, so "attracts" is appropriate.
For the fifth blank in "Trap Crop", if you plant a crop you won't use for the main purpose (like eating), "harvest" is the right word.

Step2: Fill in the blanks

• In "Crop Rotation": Nitrogen - fixation (beans and legumes) naturally replenish soil nutrients.
• In "Intercropping": Use space more efficiently.
• In "Companion Planting": Plants do the work (help each other).
• In "Trap Crop": A plant that attracts agricultural pests (usually insects) away from nearby crops.
• In "Trap Crop": Need to take time and space to plant a crop you won't harvest.

Answer:

• Crop Rotation: Nitrogen
• Intercropping: space
• Companion Planting: help
• Trap Crop: attracts
• Trap Crop: harvest