A field experiment was carried out at Regional Coconut Research Station, Bhatye (DBSKKV, Dapoli), Maharashtra (India) during 2013-2018 to study the productivity and carbon sequestration potential as influenced by integrated nutrient management (INM) practices in coconut based cropping system. INM practices viz., T1- 75 per cent of RDF+25 per cent of N through organic recycling with vermicompost, T2- 50 per cent of RDF+50 per cent of N through organic recycling with vermicompost + vermiwash application + bio-fertilizer application + in situ green manuring (cowpea), T3- fully organic: 100 per cent N through organic recycling with vermicompost + vermiwash application + bio-fertilizer application + in situ green manuring (cowpea) and green leaf manuring + composted coir pith, husk incorporation and mulching with coconut leaves were imposed in coconut based cropping system involving nutmeg, cinnamon, banana and pineapple. For comparison, T4- control: monocrop of coconut with recommended NPK and organic manure was maintained. Four treatments were laid out in a block of 0.45 ha area each. Among the different INM practices, treatment T1 sequestered the highest amount of above ground (coconut + nutmeg) carbon stock (31.1 t ha-1) followed by T2 (30.3 t ha-1) and T3 (27.3 t ha-1). In contrast, the treatment T4 - coconut monocrop alone had sequestered 25.6 t ha-1. The below-ground soil carbon stock in the rhizosphere of different crops was the highest in the nutrient management under T3 followed by T2 and T1, whereas, it was the lowest in coconut monocrop. The productivity of the system was higher in the intercropping garden. The coconut nut yield (5-year average) was higher yield under T1 (147.2 nuts palm-1 year-1), followed by T2 (138.4 nuts palm-1 year-1) and T3 (123.6 nuts palm-1 year-1), whereas, monocrop had recorded a significantly lower number of nuts (97.2 nuts palm-1 year-1).

Field experiment was carried out at All India Coordinated Research Project on Palms, Regional Coconut Research Station, Bhatye (DBSKKV, Dapoli), Maharashtra, (India) during the period of 2004-2016 to assess the carbon sequestration and productivity potential of twelve coconut hybrids and three varieties which was laid out in a randomized block design with three replications. Results showed that the two hybrids viz, GBGD x ECT (127.6 nuts/palm/year) and COD x LCT (108.0 nuts/palm/year) are superior with respect to nut production followed by WCT x MYD (107.6 nuts), ECT x GBGD (106.9 nuts) and the standard variety ‘Pratap’. Furthermore, the coconut orchard substantially contributed towards improving the above and below ground carbon stock. The above ground standing biomass and carbon stock recorded was the highest in the variety East Coast Tall (312 kg/plant and 27.32 t/ha, respectively) followed by hybrid WCT x GBGD (308.69 kg/plant and 27.01 t/ha, respectively) and the lowest was in hybrid MYD x ECT (138.71 kg/plant and 12.14 t/ha, respectively). The highest soil carbon stock 39.12 t/ha and 37.16 t/ha at 0-30 and 31-60 cm depth was recorded in the rhizosphere of hybrid ECT x MYD and the lowest soil carbon stock (35.52 t/ha and 34.71 t/ha) was observed in hybrid PHOT x GBGD.

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The major pests incidence and intensity on coconut was recorded during fixed plot survey. It was carried out at bimonthly interval from April 2018 to February 2019 at Regional Research Station, Bhatye, Ratnagiri jurisdiction. Two plots were selected for observations, one was well managed (good sanitation, use of fertilizes etc.) and another unmanaged (poor sanitation, no use of fertilizers etc.). The major pest status in managed garden was found minimum which recorded rhinoceros beetle (25.7%), eriophyid mite (41.7%) and mite grade index 0.71. Whereas, maximum infestation of rhinoceros beetle (Oryctes rhinoceros L.), red palm weevil (Rhynchophorus ferrugineus O.) and eriophyid mite (Aceria guerreronis Keifer) were observed 30.3, 0.3, 71.7 per cent, respectively and mite grade index was recorded 1.57 (moderate) in unmanaged garden. The average data of two fixed plots revealed that the maximum infestation (48.0%) was observed in June 2018 and minimum incidence was observed in February 2019 which recorded 7.64 per cent. The infestation of red palm weevil and black headed caterpillar (Opisina arenosella W.) were recorded 1.11 and 0.64 per cent only in February 2019. The highest infestation of eriophyid mite was recorded 64.9 per cent in April, 2018 and least incidence (41.6%) was observed in October, 2018. The mite damage grade index 1.39 (Moderate) was recorded in February 19. However, lowest (0.67) was observed in October, 2018.