TY  - BOOK
AU  - Bartjolomew,W.V.
TI  - Soil nitrogen changes in farming systems in the humid tropics
KW  - SUELOS - NITRÓGENO
KW  - PLANTAS - NITRÓGENO
N2  - The available information shows: (1)that rather large quantities of nitrogen are contained in fallow vegetation and underlying soil ant that upon clearing the fallow large amounts of nitrogen era mineralized; (2)That leaching processes are not such thata the nitrate is rapidly moved out of the soil and sub-soil; (3)that there is no good evidence for or against the proposition that the ordinary arable crops are shallow feeders and the fallow vegetation has deep root systems; since soil dry out in the dry season there are some plant covers which indicate more nitrate in sub-soils under arable than fallow conditions; and (4)no data were found which would negate the hypothesis that sub-soil nitrogen is an important component in the nitrogen cycle in the tropics
UR  - https://drive.google.com/file/d/1qQ4fU22rW05PZhZ0WmaFqz8UqFgcOyjD/view?usp=drivesdk
ER  -