Crops and Soil: Four Difficulties, 4000 Levels
Crops and Soil has four difficulties with 1000 levels each and ten questions per level; check soil before choice. Crop levels ask for texture, pH or rotation; identify the soil constraint first.
作物与土壤基础闯关Crops and Soil Basics1000 关作物与土壤进阶闯关Crops and Soil Intermediate1000 关作物与土壤高阶闯关Crops and Soil Advanced1000 关作物与土壤挑战闯关Crops and Soil Challenge1000 关
How it works
- Start at the basic difficulty.
- Ten questions per level; clear one to unlock the next.
- Review at 1/3/7/14/30 days.
FAQ
Which difficulty?
Start at basic and move up when accuracy stays above 80%.
How many levels each?
1000.