Mechanism of response to heavy manuring in rice varieties.

amidon arroz azote cellulose celulosa fertilisation fertilizer application feuille fisiologia vegetal gas exchange hojas intercambio de gases leaves ligninas lignine lignins nitrogen paille de riz paja de arroz photosynthese photosynthesis plant physiology plant population plant response racine rendement rendimiento respuesta de la planta rice rice straw riz roots starch variedades varieties yields