TY - BOOK TI - Proceedings of the National Symposium on new trends in crop improvement of perennial species, August 30, 1990, Kottayam U1 - 575:631.52:061.3 PY - 1990/// CY - Kottayam PB - RRII, Division of Botany KW - Crop breeding KW - Hevea breeding KW - Hevea genetic improvement KW - Hevea genetic parameters KW - Hevea hybrid correlation KW - Rubber prepotency ER -