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Phosphorus is a basic nutrient for plant growth and it becomes determinant of yield and persistence of pasture legumes under conditions of poor and acid soils, a common situation observed in Portugal. P defficiency leads to low nodule mass per plat and lower quantities of symbiotic fixed nitrogen. The nitrogen demand from the plant has an effect over Rhizobium activity. However in low P, Rhizobium activity might be impaired. This situation leads possible to a limitation of white clover growth by phosphorus and nitrogen defficiency.
Phosphorus is a basic nutrient for plant growth. P uptake by white clover is the result of a passive and an active process: the firts a mass flow effect and the second called as a “proton motor force” mechanism. The passive process, is dependent from the external nutrient concentration, permeability of root tissues and plant transpiration rate.
The first results from the suiss FACE experiment showed a sink-limitation in the response of Lolium perene to elevated PCO2.
