Crop nutritional requirements and input use efficiency on llanos oxisols under crop rotations

acid soils aluminio aluminium amendement calcique besoin nutritionnel cajanus cajan colombia colombie enmiendas calizas exigence des plantes ferralsol ferralsoles ferralsols fosforo liming materials llanuras magnesio magnesium necesidades de las plantas necesidades de nutrientes nutritional requirements oryza sativa phosphore phosphorus plaine plains plant requirements potasio potassium rotation culturale rotational cropping soil toxicity sol acide toxicidad del suelo zea mays