निम्नलिखित में से किसने मृदा वर्गीकरण प्रणाली की एक व्यापक योजना प्रस्तुत की थी?

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?