Author(s):

Chandrakant, Kadalli GG, Prakash NB, Basavaraja PK, Thimmegowda MN and Mallesh BC

Abstract: A field experiment was conducted at Krishi Vigyan Kendra, Hadonahalli, and Bangalore rural district, to study the effect of lignite human (LH) and poultry manure humin (PMH) application on soil properties after harvest of maize crop in an acid soil of eastern dry zone of Karnataka. The experiment was laid in RCBD comprising ten treatments and three replications. The results revealed that significant variation was observed on soil properties due to application of Farm Yard Manure (FYM), LH and PMH. Slight increase in soil pH and EC was recorded due to humin application and highest pH (4.94) and EC (0.19 dS m^-1) were higher in T₁₀ (PMH @ 10 t ha^-1) treatment. The soil organic carbon was (5.18 g kg^-1) higher in lignite based humin @ 10 t ha^-1 treated plot. The available major nutrients (160.68, 35.87 and 282.60 N, P₂O₅ and K₂O, kg ha^-1 respectively) status of post-harvest soil was significantly higher in T₉ (PMH @ 7.5 t ha^-1 + FYM @ 2.5 t ha^-1). Higher exchangeable Ca and Mg (3.23 and 1.17 c mol (p+) kg ha^-1, respectively) was recorded in T₂ (100% RDF + FYM @ 10 t ha^-1) and higher available sulphur (16.01 kg ha^-1) in T₉. The DTPA extractable micronutrients (13.63, 14.44, 1.22, 1.21 and 0.34 mg kg^-1 of Fe, Mn, Zn, Cu and B respectively) were higher in T₂ and all these parameters were recorded lower in control plot (T₁) where no manures and fertilizers were applied. Significantly higher maize kernel (8070 kg ha^-1) and stover yield (9948 kg ha^-1) were recorded in treatment T₂ and which was found on par with treatment T₇ (PMH @ 2.5 t ha^-1 + FYM @ 7.5 t ha^-1) and T₃ (LH @ 2.5 t ha^-1 + FYM @ 7.5 t ha^-1) and T₈ (PMH @ 5 t ha^-1 + FYM @ 5 t ha^-1). These results suggest that FYM can be substituted to the extent of 5 t ha^-1 with PM humin or 2.5 t ha^-1 with lignite based humin without any detrimental effect on soil properties and without compromising the yield of maize.

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