Reduction in the size of new leaves is one of the first symptoms of P deficiency although leaf colour remains green.  Deficiency progresses, growth of main stem slows down & finally stops.  New leaves become dark green in colour & are reduced in size. Lower leaves sometimes develop an orange-green colour.  Margin of older leaves turns to brown colour (marginal browning). Finally resulted in premature death of affected leaves.  Flowering is delayed with reduction in size & number of leaves.

6kg of super phosphate soaked in 100 lit of water for one day & the supernatant solution should be filtered & give in foliar spray at 10 days interval still the symptom disappears.  Feeding with 0.30-0.40 monoammonium phosphate / litre of water, 5 times was recommended.  Application of 30-60g super phosphate / m2 was also very effective to control the deficiency.