Attempts to leach the excess salts from a saline-sodic soil resulted in a marked reduction of crop yields. To what is this most likely due?
A) removal of Ca2+ and Mg2+ ions from the exchange complex
B) deficiency of iron and manganese
C) increase in the Al3+ concentration
D) increase in percentage sodium saturation
E) increase in the soil pH
D
You might also like to view...
GDI fuel injectors operate under a pressure of about ________
A) 90 to 150 PSI B) 2,000 to 5,000 PSI C) 500 to 2,900 PSI D) 35 to 45 PSI
How are the stator windings in a typical truck alternator configured?
A. wye connection B. delta connection C. twisted triad D. semi-elliptical
A large amount of oxygen around flammable materials or sparks can cause _____
a. slow, persistent oxidation of the electrodes b. severe weakening of the root pass welds c. rust or scale to enter the weld puddle d. rapid and uncontrolled combustion
A given weight of water can carry more heat than the same weight of air because _____
a. water is heavier than air b. water has a greater specific heat c. air has a greater pressure drop d. water has less friction within piping