Influence of combined use of organic, inorganic and biological sources of nutrients in sweet orange

The present investigation entitled “Influence of combined use of organic, inorganic and biological sources of nutrients in Sweet orange” was carried out to find out the suitable combinations of organic, inorganic manures, bio-fertilizers for higher yield and better fruit quality in sweet orange. A field experiment was laid out in Randomized Block Design (RBD) during 2011-2013 with nine treatments replicated thrice. The yield contributing characteristics viz., number of flower Shoot-1, number of fruit Shoot-1 and fruit set per cent influenced significantly due to different nutrient management treatments. The maximum fruit yield was recorded in treatment T7 (75% Rec. N (900 g N/tree) + 25 % N through Neem cake + Bio fertilizers (AM +PSB @ 100 g/tree). The fruit chemical parameters i.e., highest TSS was recorded in treatment T5 (75% Rec. N (900 g N/tree) + 25 % N through FYM + Bio-fertilizers (AM+PSB @ 100 g/tree) while highest ascorbic acid content was recorded in treatment T8 (100% Rec. N, P&K (1200:400:400 g NPK/tree) + Bio fertilizers (AM+PSB @100 g/tree). As in treatment T8 (100% Rec. N,P&K (1200:400:400 g NPK/tree) + Bio fertilizers (AM+PSB @ 100 g/tree) had highest B:C ratio because of no organics which resulted in lowering the cost and ultimately reflecting higher B: C ratio.