Preliminary investigations on soybean (Glycine max L. Merill) at Maha Illuppallama (1973-1977) [field trials, yields, Sri Lanka]

agronomic characters asia asie crops cultivation cultivo cultivos dicotiledoneas dicotyledons economic plants espacement espaciamiento essai feed crops feed legumes glycine glycine (genre) glycine (genus) glycine max legumes leguminosae leguminosas leguminosas forrajeras methode methods papilionoideae plantas plantas forrajeras plante plante de culture plants pratique culturale productividad productivity profitability pruebas recherche rendement rendimiento rentabilidad research rosales spacing sri lanka trials yields