Author(s):

Karam Husain, SD Dubey, Dhananjai Singh and RL Srivastava

Abstract: An experiment was conducted during 2008-09 to 2011 -12 at Oilseeds Research Farm, C. S. Azad university of Ag and Tech. Kanpur to study the effect of Effect of nutrient management on yield and economics in maize – linseed cropping system. The experiment was laid out in Randomized Block Design with three replications. The soil was neutral in reaction and low in available nitrogen, phosphorus but medium in available potassium. There were 16 treatments in this experiment viz. 100% NPK to maize and 100% NPK to linseed (T₁), 100% NPK to maize and 75% NP+ Azotobacter + PSB+100%K to linseed (T₂), 75% NP+ Azotobacter +PSB+100% K to maize and 100% NPK to linseed (T₃), 75% NP+ Azotobacter + PSB+100% K to maize and 75% NP + Azotobacter + PSB+100% K to linseed (T₄), 75% NPK to maize and 75% NPK to linseed (T₅), 75% NPK + 5t/ha FYM to maize and 75% NPK to linseed (T₆), 75% NPK+ 5t/ha FYM+ Azotobacter + PSB to maize and 75% NPK + Azotobacter + PSB to linseed (T₇), 75% NPK+ 5t/ha FYM+ Azotobacter + PSB to maize and 50% NPK + Azotobacter + PSB to linseed (T₈), 75% NPK+ 3t/ha FYM+ Azotobacter + PSB to maize and 75% NPK + Azotobacter + PSB to linseed (T₉), 75% NPK+ 3t/ha FYM+ Azotobacter + PSB to maize and 50% NPK + Azotobacter + PSB to linseed (T₁₀), 50% NPK+ 5t/ha FYM+ Azotobacter + PSB to maize and 50% NPK + Azotobacter + PSB to linseed (T₁₁), 50% NPK+ 5t/ha FYM+ Azotobacter + PSB to maize and 50% NPK to linseed (T₁₂), 50% NPK + Azotobacter + PSB to maize and 50% NPK to linseed (T₁₃), 100% NPK to maize and No NPK to linseed (T₁₄), No NPK to maize and 100% NPK to linseed (T₁₅) No NPK to maize and 100% NPK to linseed (T₁₆). The data (Grain yield of maize, Seed yield of linseed, Linseed equivalent yield and NMR) generated during the experimentation for 4 consecutive years (2008-09 to 2011-12) were pooled for conclusion. On pooled basis, application of nutrients @ 75% NPK+ 5t/ha FYM+ Azotobacter + PSB to maize and 75% NPK + Azotobacter + PSB to linseed brought significant increase in grain yield of maize (4519 kg/ha), seed yield of linseed (1780 kg/ha), linseed equivalent yield (3141 kg/ha), net monetary return (Rs 60052 /ha) and B:C ratio (2.67) but 75% NPK+ 3t/ha FYM+ Azotobacter + PSB to maize and 75% NPK + Azotobacter + PSB to linseed was on par and second in order with grain yield of maize (4368 kg/ha), seed yield of linseed (1760 kg/ha), linseed equivalent yield (3076 kg/ha), net monetary return (Rs 58620 /ha) and B:C ratio (2.65) as compared to best one. However, 100% NPK to maize and 100% NPK to linseed (T₁), 100% NPK to maize and 75% NP+ Azotobacter + PSB+100%K to linseed (T₂), 75% NP+ Azotobacter +PSB+100% K to maize and 100% NPK to linseed (T₃) were also on par with above two treatments. Thus, the yield of maize and linseed observed in these treatments can be emulated by 100% NPK to both the crops. The status of nutrient in the soil after harvest of fourth crop of linseed revealed that substitution of nitrogen through FYM/ azotobacter along with PSB enriched the soil in respect of organic carbon and major nutrients over initial status of the soil (Organic carbon 0.345%, Available N: 146.4 kg/ha, Available P: 7.85 kg/ha and Available K: 170.4 kg/ha). Application of nutrients @ 75% NPK+ 5t/ha FYM+ Azotobacter + PSB to maize and 75% NPK + Azotobacter + PSB to linseed showed the highest soil nutrient enrichment followed by 75% NPK+ 3t/ha FYM+ Azotobacter + PSB to maize and 75% NPK + Azotobacter + PSB to linseed. Though the oil content in linseed was observed maximum with 75% NP+ 100% K + Azotobacter + PSB to both the crops (40.42%) but the oil yield was recorded the highest with 75% NPK+ 3t/ha FYM+ Azotobacter + PSB to maize and 75% NPK + Azotobacter + PSB to linseed (702.42 kg/ha). Thus it is recommended that application of nutrients in maize-linseed crop system @ 75% NPK+ 3t/ha FYM+ Azotobacter + PSB to maize and 75% NPK + Azotobacter + PSB to linseed would be more beneficial and sustainable to the farmers adopting maize – linseed crop system in central plain zone of Uttar Pradesh and keeping each inputs constant, the quantity of 5t/ha FYM may be replaced by 3t/ha FYM.

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