Influence of the soil fertility factors on the P absorption of rey-grass grown in saline soils

Abstract

The relation between dry matter production of ry-grass and the intensity factor in the saline soils of the province of Saragossa (Spain) was studied. The maximum yield of rey-grass was attained at different levels of phosphorus in the soil solution. These values are from 3 to 12 ppm P. The addition of phosphorus to these soils also improves the quality of rey-grass by increasing its P content. Furthermore the salinity present in the soil affects the phosphorus concentration in the soil solution necessary to obtain 0.60 % P in rey-grass. The intensity varies from 0.86 to 8 ppm P. In the soils studied, the phosphorus uptake by the plant is governed by the replenishment factor, as the maximum P asorption is attained at a factor of 4.