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AUTHOR(S): Rani B., Jacob John
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ABSTRACT A study was conducted at the Integrated Farming System Research Station, Karamana,A study was conducted at the Integrated Farming System Research Station, Karamana,Kerala, in a rice- rice cropping sequence during kharif and rabi seasons for five years to evaluate theeffect of site specific nutrient management (SSNM) on wetland rice. The experiment was laid out in arandomized block design with the high yielding medium duration, red grained rice variety Uma. Thetreatments included three nutrient omission plots (N0, P0, and K0) and five SSNM plots receivingdifferent levels of N, P and K (N1- 150 kg N ha-1, P1 to P3 - 30, 60 and 90 kg P2O5 ha-1 and K1 to K3- 40,80 and 120 kg K2O ha-1) along with Zn and S (20kg S ha-1 and 40 kg ZnSO4 ha-1) which were generallylow in all the farmers fields, in addition to the state recommended dose of nutrients (SRDN) - 90:45:45kg N: P2O5: K2O ha-1 and farmers’ fertilizer practice (FFP) - 90:22.5:22.5 kg N: P2O5: K2O ha-1. TwoSSNM treatments receiving either S or Zn were also included to study their individual effects. Resultsrevealed that the SSNM treatments generated a yield gain (system productivity) of 3.587t to 3.917tcompared to the nitrogen omission treatment, and 1.665 t to 2.005 t compared to SRDN and 3.36 tto3.69 t compared to FFP. Skipping P or K continuously decreased rice yields significantly compared tothe SSNM treatments but was better compared to FFP or state recommendation. The recovery efficiencyof nutrients (RE) was higher for the SSNM treatments (N150, P30 to P90 and K40 to K120) than staterecommendation or farmers’ practice, but the physiological efficiency of nutrients remained comparableirrespective of the nutrient management practice or the level of applied nutrients. The agronomicefficiency showed an increase in the SSNM treatments but generally decreased with increasing levels ofnutrient application. |
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KEYWORDS Site specific nutrient management, rice productivity, nutrient use efficiency |
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Cite this paper Rani B., Jacob John. (2022) Site Specific Nutrient Management for Increased Productivity and Nutrient Use Efficiency in a Rice- Rice Cropping System. International Journal of Agricultural Science, 7, 155-161 |
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