Vol. 12, Special Issue 8 (2023)

Author(s):
MM Sreelakshmi, B Aparna, Rani B, Biju Joseph, Bindhu JS and Binitha NK

Abstract:
The current study investigated the dynamics of major nutrients in eight major soil series of Agro ecological Unit 11 of northern Kerala. Kalikkadavu series recorded the highest mean value for available N at 0-15 cm and 15-30 cm soil depth. A decreasing trend in available N was observed with increase in soil depth. Payalam series showed the highest value for Available P and it varied from 13.56-48.73 kg ha^-1. The lowest value of 13±1.33 kg ha^-1 was observed in Naduvattom series. Available K of Arathil series was found the highest with mean values of 397.6 kg ha^-1 and 497.28 kg ha^-1 at a depth of 0-15 cm and 15-30 cm respectively. In surface soils, Payalam series recorded the highest calcium content with a mean value of 534±86.94 mg kg^-1 whereas Kalikkadavu recorded the lowest with a mean value of 318±17.52 mg kg^-1. Arathil series recorded the highest value with a mean value for available Mg at both depths. Angadipuram series recorded the highest mean value for available S at 0-15 cm depth and it varied from 15.5-360 mg kg^-1 within the series. To conclude, it was observed that the dynamics of primary as well as secondary nutrients exhibited variation in the major lateritic soil series of northern Kerala. The nutrient classes of surveyed samples was found medium to high for available N, available P, and low to high for available K content. Deficiency of Ca, Mg, and S were also prevalent in the study area. Hence, we recommend a proper nutrient management for wetland rice cultivation in detrital laterite derived rice fields.