Yield responses of upland rice grown on tagaytay loam to the addition of nitrogen phosphorus and potash.

abonos abonos potasicos arroz azote engrais engrais potassique experimentation fertilizers fosforo highlands loam soils nitrogen phosphore phosphorus plant response potash fertilizers rendement rendimiento respuesta de la planta rice riz soil types sol sablolimoneux suelo franco tipos de suelos type de sol yields