Vol. 7, Issue 1 (2019)

A pot culture experiment was conducted in the Department of Soil Science and Agricultural Chemistry, BTC College of Agriculture and research Station, Bilaspur, during Kharif season 2017-18. using two representative soils (Vertisol and Inceptisol) collected from village Mungeli (Vertisol) and Jhajh (Inceptisol) of the mungeli district.

The objectives of the study were to identify the specific nutrients which limit the crop yield through rice -response using nutrient omission technique during kharif season, 2017 and to demonstrate the optimum use of identified limiting nutrients and it’s comparison with farmer’s fertilizer practice with wheat crop during rabi season. 2017-18. On the basis of 1st season results farmer’s field demonstration was also carried out at field of farmer’s (from where bulk of soils were collected for pot experiment) during Rabi season 2017-18. The soils used for pot experiment were two type i. e. Inceptisol and Vertisol. Both the soils were collected from two different locations of Mungeli district. Collected soils were air dried and filled in cemented pots. The treatments constituted with application of all nutrients applied at optimum level known as All (SSNM dose) while in others, one of the nutrient elements from all the nutrient treatments (All) was omitted. There were eleven treatments for each type of soil and three replications with completely randomized design. All treatments were common for both the soils except omission of Fe and Mn in case of Vertisol and omission of Ca and Mg in case of Inceptisol were kept keeping the concept of soil reaction. After addition of all treatments, rice (IGKV-1 “rajesh wari”) was transplanted in three hills/pot with 2-3 seedlings in each hill. The treatments constituted with application of all nutrients applied at optimum level known as SSNM dose while in others, one of the nutrient elements from all the nutrient treatments was omitted. Total 11 treatments were tested with rice (IGKV-1 “rajeshwari”) as a test crop, laid out in CRD (Completely Randomized Block Design) with three replications.

In eleven treatments, first treatment was application of all nutrients (N, P, K, S, Fe/Ca, Mn/Mg, Cu, Zn, B and Mo) and sequentially each nutrient was omitted from all nutrients applied (SSNM). The yield reductions were more pronounced with N and P omission. The P, Ca, Mg, S, Mn, Zn and B content in rice grain were recorded with the treatment (T1) which received all the nutrients. While, treatment T11 had recorded significantly the highest value of N content in rice straw. In case of Inceptisol, significantly, the highest P, K, Ca, Mg and S content were recorded in treatment T1 which received all nutrients. The highest value of P, Mg content in rice straw were recorded in treatment T1 received all nutrients. Treatment T11 had showed the maximum content of N in rice straw.

The overall study indicated that N, P, S nutrients in Vertisols and N, P, S nutrients in Inceptisols of Bilaspur district were traced as limiting nutrients which should be applied for optimum crop production.