EFFECT OF INTEGRATED USE OF BIOCHAR AND ORGANIC MANURES ON SOIL PROPERTIES AND GROWTH OF KNOLKHOL(Brassica oleracea var.gongyloidesL.)

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Date
2019-09
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Sher-e-Kashmir University of Agricultural Sciences and Technology, Jammu, Jammu
Abstract
A field experiment was conducted to evaluate the effect of biochar with different sources of organic manures on soil properties, growth, yield and economics of knolkhol (Brassica oleracea var.gongyloidesL.) at Organic Farm Research Center, SKUAST-J, Chatha, J&K, India from October2018 to January 2019. The experiment was laid out in Randomized Block Design (RBD) with 8 treatments i.e. Control (T1), 100% N through FYM (T2), 100% N through vermicompost (T3), 50% N through FYM + 50% N through vermicompost (T4), 2tha-1 biochar (T5), 2 t ha-1 biochar + 100% N throughFYM (T6), 2tha-1 biochar + 100% N through vermicompost (T7), 2tha-1 biochar + 50% N through FYM + 50%through vermicompost (T8) replicated 3 times. Biochar was prepared from locally available rice husk under pyrolytic condition and applied in conjunction with other organic amendments before 15 days of transplanting.Results revealed that integration of biochar with 100% N through FYM (T6), + 100% N through vermicompost (T7),50% N through FYM + 50% through vermicompost (T8) increased crop yield by 21.54%, 25.43% and 24.64%, respectively over the sole application of FYM and vermicompost i.e. 100% N through FYM (T2), 100% N through vermicompost (T3), 50% N through FYM + 50% N through vermicompost (T4), respectively.No significant differences in the knolkhol yield were observed between the T6, T7 and T8 plots. Three times increased in knolkhol yield was observed with the combine application of FYM, vermicompost and biochar (T8) as compared to control.The soil aggregate stability, maximum water holding capacity and infiltration rate were maximum 1.5 times, 1.24 times and 2.93 times, respectively with the application of 2tha-1 biochar + 50% N through FYM +50%through vermicompost (T8) as compare to control. Similarly, increase in organic carbon (9.5%), available nitrogen (12.38%), available phosphorus (24.19%), available potassium (8.54%), soil microbial biomass carbon (33.27%) and dehydrogenase activity (5.68%) was also recorded with the combined application of FYM, vermicompost and biochar (T8). Maximum benefit cost ratio was recorded (1.7) from the integration of 2 t ha-1 biochar + 50% N through FYM + 50% through vermicompost (T8). The study concluded that the combined application of FYM, vermicompost and biochar not only improved soil fertility but also increased profit and yield of knolkhol.
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