Rhizosphere pH of different plant species supplied with 200 kg nitrate/ha 65 1A 6A 6B 6C 6D m Sorg Barley Lentil(小扁豆) Cowpea(豇豆) ckpea Not all species increase pH Romheld 1986
Römheld 1986 Rhizosphere pH of different plant species supplied with 200 kg nitrate/ha Sorghum and chickpea Barley Lentil(小扁豆) Cowpea(豇豆) Not all species increase pH
Rhizosphere pH and P depletion in soil canola 5300 100%NO 80%NO 5280 20%NH4 0260 234 mm distance from the root surface Lower rhizosphere pH Gahoonia a nielsen 1992 improves P availability
Gahoonia & Nielsen 1992 Rhizosphere pH and P depletion in soil 1 2 3 4 1 2 3 4 pH P concentration ( g P/g soil) mm distance from the root surface 5 6 7 260 280 300 100% NO3 - 80% NO3 - 20% NH4 + canola Lower rhizosphere pH improves P availability
P supply and cluster root formation and rhizosphere pH of white lupin N supplied as NO3 Cluster roots formed at low p pH decrease is due to organIC acid extrusion to mobilise P:-not associated with NO, assimilation 8A 你1cm 8 B No P Foliar p Romheld 1986
Römheld 1986 P supply and cluster root formation and rhizosphere pH of white lupin No P Foliar P N supplied as NO3 - Cluster roots formed at low P; pH decrease is due to organic acid extrusion to mobilise P; - not associated with NO3 - assimilation