Characterization, Extraction of Biochar and Humic Acid on Yield Parameters of Maize in Maize-Chickpea Cropping System and Its Residual Effect on Chickpea under Rainfed Condition

A field experiment was conducted during Kharif 2019 and 2020 in a at ICAR-Krishi Vigyana Kendra, Kalaburagi-II (Raddewadagi), Jewargi taluk, Kalaburagi district, to study the characterization, extraction of biochar and humic acid on yield parameters of maize in maize-chickpea cropping system and its residual effect on chickpea under rainfed condition .The results showed that, the biochar was highly alkaline in nature (pH of 8.91), medium in salt content with an electrical conductivity of 1.89 dS m-1. The total carbon content (78.20 g kg-1), nitrogen, phosphorus and potassium (0.64, 0.29 and 1.02 %, respectively). It also showed good amount of secondary and micronutrients. Biochar had also lower the bulk density (0.54 Mg m-3) and good water holding capacity (67.50 %). Whereas, the humic acid showed acidic in reaction (pH 4.20) and higher the nitrogen content (1.38 %). The maize was the test crop to study the direct effect and chickpea was raised to study the residual effect. The experiment were laid out in Randomized Complete Block Design with fifteen treatments and replicated thrice. The pooled analysis revealed that significantly higher significantly higher yield and yield parameters of maize and succeeding chickpea crops were recorded with application of 100 % NPK + biochar @ 5 t ha-1 + HA @ 10 kg ha-1 and it was on par with the treatment receiving 100 % NPK + biochar @ 2.5 t ha-1 + HA @ 10 kg ha-1 compare to other treatments.