Which one among the following is *not* correct regarding the black soi

Which one among the following is *not* correct regarding the black soils of Peninsular India?

Rich in iron, lime and potash
Retentive in moisture
Fertile and well-suited for growing sugarcane
Rich in phosphorus and organic matter
This question was previously asked in
UPSC CAPF – 2013
The statement that black soils are rich in phosphorus and organic matter is incorrect.
Black soils (Regur) are derived from weathering of basaltic rocks (Deccan Traps) and are rich in minerals like iron, lime, calcium, potash, aluminium, and magnesium. They have a high clay content, which gives them excellent moisture retention capacity. They are generally fertile and suitable for crops like cotton, sugarcane, groundnut, tobacco, and millets. However, they are typically deficient in nitrogen, phosphorus, and organic matter (humus).
The deficiency in phosphorus and organic matter means that these nutrients often need to be supplemented through fertilizers for optimal crop yield, especially for nutrient-demanding crops like sugarcane. Their characteristic black colour is attributed to the presence of titanium salts and iron oxides.