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Subject: Soil Science × Author: Amit Kumar × End date: 2017 × Start date: 2015 × Type: Thesis ×
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    ThesisItemOpen Access
    Effect of nutrient sources on nitrogen mineralization, carbon storage and yield of turmeric under harda (Terminalia chebula) based agroforestry system
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2017-06) Amit Kumar; Dwivedi, G.K.
    The present investigation was carried out for two years during 2015-2017 at Agroforestry Research Centre, G.B. Pant University of Agriculture and Technology (Haldi), Pantnagar. The experiment comprised of two farming systems (Harda open system) with eight treatments viz., Control, FYM, PM, WS, Vermicompost, NPK, Integrated 100 and 50%. The experiment was laid out in split plot design (SPD) with three replications, AF systems in the main plot and nutrient sources in sub plot treatments. The soil of the experiment site was silty clay loam having pH (7.15), EC (0.35 dSm-1), OC (0.80%) and available NPK 203.47, 16.68, 155.95 kg ha-1 respectively. The result of the experiment reveal that physical and chemical properties were significantly affected by farming systems as well as nutrient sources. The bulk density was recorded lower under AF system as compared to open one. Similarly, among nutrient sources the effect of organic sources was more pronounced as compared to NPK. SOC, available NPK status were also significantly increased due to nutrient sources as well as farming systems. SOC and available NPK increased by 28.6, 10.8, 42.7 and 13.6% respectively under harda AF system as compared to open system whereas increase of 27.0, 39.0, 52.0 and 20.1% of SOC, available NPK respectively were found under 100% integrated nutrient sources. The carbon stock (25%), CO2 evolution and carbon fractions were recorded higher under AF system than open system. The higher active and passive pools comprising of very labile, labile, less labile and non labile were recorded higher under farming system and NH4+ and NO3- fractions were also greatly influenced by farming system and nutrient sources. In turmeric crop, plant height, LAI, NPK content, uptake, rhizome yield, curcumin content and curing percentage were also greatly affected by the harda tree and nutrient sources. 100% integrated nutrient source recorded highest rhizome yield and was superior by 45.81 per cent over control. However, it decreased under harda tree. Curcumin content was also higher under harda tree system by 6.57%. There was an increment in tree height, DBH and crown width of harda tree by 9.42, 9.05 and 20.19 per cent respectively at the end of study period. It was also observed that harda tree produced 2.80 t ha-1 litter during the study. Therefore, it is concluded from the study that turmeric-harda tree system is a suitable agroforestry system where the overall yield of turmeric and harda as well as quality of the turmeric was greatly improved along with considerable improvement in the carbon stock and nitrogen mineralization.