
%0 Journal Article
%A Pinkerton, A 
%T Critical phosphorus concentrations in oilseed rape (<I>Brassica napus</I>) and Indian mustard (<I>Brassica juncea</I>) as affected by nitrogen and plant age
%J Australian Journal of Experimental Agriculture
%D 1991/02/01
%V 31
%N 1
%P 107-115
%K 
%R https://doi.org/10.1071/EA9910107
%U https://www.publish.csiro.au/paper/EA9910107 
%X Oilseed rape and Indian mustard were grown in sand culture experiments in a glasshouse to derive values for a tissue test for the diagnosis of phosphorus (P) deficiency. Seven rates of P, combined factorially with 3 rates of nitrogen (N), were used to determine critical P concentrations. Suitable tissues to sample for a diagnostic test were the whole shoot of both species at any stage, or the youngest fully expanded leaf of rape and leaves 4-6 of mustard at the rosette stage. Critical P concentrations depended on both plant age and N supply. The critical values reported here for rape agreed closely with critical values found previously in tissues of field-grown crops of similar phenological age. Critical P levels in whole rape shoots adequately supplied with N decreased from 0.29% at the early rosette stage to 0.21% at the late rosette or yellow bud stage, while critical values in mustard fell from 0.25% at the early rosette stage to 0.18% at stem elongation to full flower. Critical P concentrations for prediction of seed yield were slightly higher (0.05% higher at the rosette stage). A nutrient supply with high P and high N reduced the seed oil concentration of both species; a low P and high N supply reduced the oil concentration in rape seed but increased it in mustard seed. 
