ChileanJAR

The effect of phosphorus fertilization on growth and nitrogen content of legumes grown on a trumao soil, with high phosphorus retention capacity, was studied under greenhouse conditions. Dry matter yields increased steadily, but not signifi cantly, when applying up to 316 Kg of P₂O₅ per hectare. Higher dosis, up to 10.000 Kg, yielded highly significant differences (P < 0,01), without noticea ble toxicity. A similar tendency was observed in total nitrogen content of the aeriarparts of the four legu mes: phosphorus deficiency caused an abnormal increase in percerit of nitrogen content, which beca me normal only aboye 316 Kg of P₂O₅ per hectare. The four legume species tested did no differ in their response to phosphorus applications.