Report of the ninth meeting of the working party on rice production and protection of the international rice commission - New Delhi, India, 11-16 Dec 1961.

abonos arroz control de enfermedades crop rotation disease control economic distribution enfermedades de las plantas engrais fertilizers fitomejoramiento graine maladie des plantes plant breeding plant diseases plant production plant protection protection des plantes resistance to injurious factors rice riz rotation culturale seeds semilla