- Plant propagation--In vitro--Congresses (2)
- Agricultural systems--Congresses (1)
- Agricultural systems--Europe--Congresses (1)
- Botany--Variation--Congresses (1)
- Corn as feed--Congresses (1)
- Corn--Breeding--Congresses (1)
- Corn--Congresses (1)
- Corn--Silage--Congresses (1)
- Crops--Congresses (1)
- Forage plants--Congresses (1)
- Forage plants--Europe--Congresses (1)
- Germplasm resources, Plant--Storage--In vitro--Congresses (1)
- Herpesvirus diseases in animals--Congresses (1)
- Latent virus diseases--Congresses (1)
- Legumes--Congresses (1)
- Legumes--Europe--Congresses (1)
- Microbial genetics--Congresses (1)
- Nitrogen--Fixation--Congresses (1)
- Plant proteins--Congresses (1)
- Plant-breeding--Congresses (1)
- Rhizobium--Congresses (1)
- 牛の病気と手当 (1)
- 牛の育種・繁殖 (1)
- 農業--農業経済・行政・経営 (1)