बिहार राज्य में मुख्य रूप से कौन सी मिट्टी सबसे बड़े भौगोलिक क्षेत्र को कवर करती है?

Field capacity, with reference to soil-water-plant relationships, primarily refers to the maximum amount of:

The soil classification terms 'Pedocals' and 'Pedalfers' were first introduced by:

Which type of soil typically develops in hot and humid tropical regions?