This paper describes the application of ISFET technology in analyzing the soil sample and correlating it with the convectional soil testing method. These devices can offer sensitive, selective, reliable, and often cheap measurements for an ever increasing diversity of sensing requirements. These sensors are procured from Microsens, Switzerland and the circuitry of ISFETs was made with the help of Elico Pvt Ltd. The experiment setup was done in ICAR-IISS, Bhopal. The soil sample were of the order Vertisol, Inceptisol and Alfisol and its analysis for soil pH, nitrate and available potassium was performed through ISFET. Also covering the conditioning and calibration procedures for ISFET. Furthermore limitation of ISFET of ISFET regarding linearity range, drift and sensitivity have been discussed. The reported sensitivity for obtained was 56.8mV/decade, 34mV/decade and 60mV/ decade for pH, Nitrate and potassium respectively. The correlation results with convectional method was significant in case of pH with R 2 = 0.95. On the other hand nitrate and potassium showed R 2 = 0.59 and 0.63 respectively in which further improvement is needed.

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A field experiment was carried out to formulate the fertilizer recommendation for Brinjal crop in Inceptisol of Chhattisgarh during Rabi season 2005-06. The objectives were to find out the nutritional requirement of the crop, The experimental field was divided in to three fertilizer gradient strips (L0, L1 and L2), which was already created during previous Kharif season, 2005 by adding different graded dose of fertilizer N, P and K with maize as exhaust crop. Thirty-six treatments considered of 3 3 factorial combinations of fertilizer N, P and FYM were superimposed over each fertility strip (L0, L1 and L2). Mukta Kesi variety of Brinjal was taken as the test crop. The crop response to added nutrients and various regression analysis were performed after the crop harvest. Linear Response Plateau (LRP) and Quadratic Response Plateau (QRP) models were used to relate yield with soil test and fertilizer dose and resulted significantly high R 2 values suggesting their suitability. Brinjal crop requried 0.31 Kg N, 0.037 Kg P and 0.57 Kg K to produce one quintal of Brinjal fruit yield. The LRP model considered constant nutrient use efficiencies for each level of soil test and fertilizer doses, However QRP model estimated variable soil and fertilizer efficiencies. The special feature of these models was the consideration of yield plateau, which makes them suitable under resource constraints situations.

An pot experiment was conducted at experimental research station Rajmohani Devi College of Agriculture and Research Station, Ambikapur during Kharif season, 2018 to study Site-specific nutrient management using nutrient omission technique in two major soil types of Koriya district of Chhattisgarh''. The objectives of the experiment were to identify the yield-limiting nutrients using the missing element technique with rice as a test crop and to demonstrate the identified limiting nutrients on farmer's field with the wheat crop to observe the yield difference with those of farmer's practice. A total of 11 treatments were tested with rice (MTU-1010) as a test crop, laid out in CRD with three replications. Grain and straw yields of rice were significantly reduced with the omission of N, P, and S in Inceptisol soil comparison to the treatment receiving all the nutrients (SSNM).The yield reduction is found to be more than 54% in the case of N, 33% in the case of P, and 15.39% in S case of Inceptisols during Kharif in rice crop. These limiting nutrients were tested on farmer's fields with wheat crop during Rabi season, 2018-19 where bulk soil samples were collected for pot culture study. The limiting nutrients were corrected with optimum doses (SSNM) as N -120, P2O5-80, K2O-50 and S-30 kg/ha along with Zn @ 5 kg/ha. Wheat grain yields recorded with SSNM dose were 34% higher than that with FPD.

Soil organic carbon (SOC) plays a critical role in terrestrial carbon cycling and is central to preserving soil quality. The effects of bio-wastes on soil carbon storage were investigated. The SOC has different pools and fractions including microbial biomass carbon (MBC), readily mineralizable carbon (RMC), and water soluble carbon (WSC). Each has a varying degree of decomposition rate and stability. The rice straw + RDF treatment was more effective in increasing WSC, MBC, RMC concentrations than the RDF treatment alone. Therefore, it could be the best option for improving carbon storage and soil health while emerging as best bio-waste management technology in the rice-rice cropping system.