Impact of planting density on wheat crop grown under different tree species in tarai agroforestry system of central himalaya, India

A field trial based Agroforestry system was established at Pantnagar during Rabi season 2012-13 for predicting the effect of spacing on growth and yield of wheat (Triticum aestivum L.) under Eucalyptus camaldulensis and Melia azedarach. The experiment was carried out in split-plot design consisting of two tree species in main plot, viz, Eucalyptus camaldulensis and Melia azedarch and four spacing treatments in sub-plot viz, 3.0m×1.0m, 3.0m×1.5m, 3.0m×2.0m and 3.0m×2.5m with three replications. The wheat crop variety“UP-2338” was sown on December 06, 2012 and harvested on April 27, 2013. Among the tree species, the maximum (15.1 q /ha) and significantly higher grain yield with 21.8% increment was recorded under Melia as compare to Eucalyptus. Whereas, among the different spacings, the wheat growth in terms of dry biomass at 120 DAS (495.4/m2 ), yield attributes and yield in terms of grain (16.0 q/ha), straw (29.4 q/ha) and biological yield (45.4 q/ha) under Melia was significantly higher at 3 × 2.5 m spacing as compared to other planting density. The correlation coefficient (r) studies exhibited that wheat growth and yield attributing characteristics shows significantly (p<0.05) high degree (r=0.75 to 1) positive correlation with each other. The investigation was done to find out the proper planting density for intercropping of wheat with tree species without comprising the wheat growth and enhancing its sustainability

Impact of planting density on wheat crop grown under different tree species in tarai agroforestry system of central himalaya, India

A field trial based Agroforestry system was established at Pantnagar during Rabi season 2012-13 for predicting the effect of spacing on growth and yield of wheat (Triticum aestivum L.) under Eucalyptus camaldulensis and Melia azedarach. The experiment was carried out in split-plot design consisting of two tree species in main plot, viz, Eucalyptus camaldulensis and Melia azedarch and four spacing treatments in sub-plot viz, 3.0m×1.0m, 3.0m×1.5m, 3.0m×2.0m and 3.0m×2.5m with three replications. The wheat crop variety“UP-2338” was sown on December 06, 2012 and harvested on April 27, 2013. Among the tree species, the maximum (15.1 q /ha) and significantly higher grain yield with 21.8% increment was recorded under Melia as compare to Eucalyptus. Whereas, among the different spacings, the wheat growth in terms of dry biomass at 120 DAS (495.4/m2 ), yield attributes and yield in terms of grain (16.0 q/ha), straw (29.4 q/ha) and biological yield (45.4 q/ha) under Melia was significantly higher at 3 × 2.5 m spacing as compared to other planting density. The correlation coefficient (r) studies exhibited that wheat growth and yield attributing characteristics shows significantly (p<0.05) high degree (r=0.75 to 1) positive correlation with each other. The investigation was done to find out the proper planting density for intercropping of wheat with tree species without comprising the wheat growth and enhancing its sustainability

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Not AvailableHerbicidal effects of leaf oil from 3-Eucalyptus species (Eucalyptus citriodora, Eucalyptus camaldulensis and Eucalyptus tereticornis) were evaluated on germination and seedlings growth of Parthenium hysterophorus L. In laboratory bioassay the different concentrations of eucalyptus essential oils significantly reduced the seed germination. Based on the germination, a dose-response curve was made and LC25 values were calculated as 0.35, 0.8 and 1.8 mg/L for E. citriodora, E. camaldulensis and E. tereticornis, respectively. The E. citriodora proved most inhibitory to seedling growth and biomass of P. hysterophorous, even at 0.25 mg/L. Spraying of E. citriodora on P. hysterophorous 4-wk-old plants decreased the plants height, membrane integrity and cellular defense i.e. showed the adverse effects of eucalyptus leaf essential oil on growth, photosynthesis and energy metabolism of target plants. Exposure of P. hysterophorus to E. citriodora leaf essential oil also enhanced the electrolyte leakage, indicating membrane disintegration. An increased level of H2O2 in spray treatment indicates the induction of oxidative stress. Thus the essential oil from E. citriodora inhibited the P. hysterophorus growth through oxidative damage, hence, could be used as directed spray to control P. hysterophorus. Key words: Electrolyte leakage, essential oil, Eucalyptus camaldulensis, Eucalyptus citriodora, Eucalyptus tereticornis, germination, hydrogen peroxide, inhibition, Parthenium hysterophorus, phytotoxicity, seedlings growthNot Availabl