TY  - BOOK
AU  - Yogaratnam N
TI  - Urea as a source of nitrogen for rubber plantations in Sri Lanka. 1. A review and preliminary observations
PY  - 1981///
PB  - Journal of the Rubber Research Institute of Sri Lanka
KW  - Rubber plantation
KW  - Sri Lanka
KW  - Urea fetilization
ER  -