A farmer started irrigating a soil some 10 years ago but in recent years yields have declined and the soil physical condition has deteriorated. Which of the following most likely accounts for this situation?
A) failure to use conservation tillage to reduce salt accumulation at the soil surface
B) high SAR of the irrigation water
C) high content of Ca and Mg in the irrigation water
D) excessive drainage of the soil
E) high gypsum content in the soil
Question 2
Non-point source losses of which element are considered to be a serious water pollution problem because the resulting high concentration of the element in stream water is toxic to most fish.
A) phosphorus B) potassium C) both A and B D) neither A nor B
Soil pH
Checklist of Developmental Skills: Birth to 5 years
Preschool: 3–6 years.
Pangaea 200 Million Years Ago
Earth 340 Million Years Ago
Three years old drawing