Pick out the wrong statement.

• Loamy soil is the best soil for vigorous plant growth, while the clayey soil is solid and hence the plant roots penetrate with difficulty.
• Large excess use of nitrogenous fertiliser in land causes the problem of diarrhoea and cyanosis.
• Application of large excess of potassic fertiliser in soil increases the valuable carotene in fruits and vegetables.
• Cereal crops grown on alkaline soil absorb higher amount of flourides thereby spreading flourosis.