Yield maximization and identification of limiting nutrients based on crop response and site-specific nutrient management in Inceptisol

Abstract

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.