Effect of recycled organic manure on yield, nutrient uptake and soil fertility status of sunflower (Helianthus annuus L.)

A field experiment was conducted during rabi 2004 under farmers' holding to study the effect of organic manure which was obtained from livestock components of integrated farming system (IFS) on the productivity of irrigated sunflower. The livestock components of IFS were milch cows (2+1), goat (10+1) and guinea fowl (20 Nos.). Treatments consisted of 100% recommended dose of NPK (40 : 20 : 20 kg N : P(2)O(5) : K(2)O/ha), 100% recommended dose of NPK (40: 20: 20 kg N : P(2)O(5) : K(2)O/ha) + FYM (12.5 t/ha), 100, 75 and 50% recommended dose of NPK (40: 20: 20, 30: 15: 15 and 20: 10: 10 kg N : P(2)O(5) : K(2)O/ha) along with 100 and 50% available organic manure (AOM) (5.8 and 2.9 t/ha) obtained from livestock components of the farm. Organic manure obtained from the livestock components of IFS was 3.8, 1:9 and 0.1 t from milch cows, goat and guinea fowl, respectively, on dry weight basis. Results revealed that higher seed yield (1591 kg/ha), nutrient uptake and soil fertility status were noticed with 40 : 20 : 20 kg N : P(2)O(5) K(2)O/ha + 5.8 t/ha of organic manure obtained from IFS components. The recommended dose of fertilizers alone (40 : 20 : 20 kg N : P(2)O(5) : K(2)O/ha alone) produced the lowest yield, nutrient uptake and post-harvest soil fertility status of sunflower.