Physiological and NPK Studies for Developing Agrotechniques for SRHD Energy Plantations in the North-Western Himalayas
2014
Gopi Chand,
The study was undertaken to develop agrotechniques for raising short-rotation, high-density (SRHD) energy plantations as a renewable energy source by using planting densities of 10,000 and 14,000 plants/ha. Under Species × Spacing × Fertilizers (N:P:K), the effect of fertilizers was more evident on plant height than on stem diameter. The species as Grevillea robusta , Bauhinia variegata , and Eucalyptus showed the most statistically significant vertical and radial growth in both of the spacings. The N:P:K::50:25:25 kg/ha produced statistically significant growth. The photosynthesis rate, as recorded, showed that Salix tetrasperma had high rates of CO ₂ assimilation but poor aerial growth. The photosynthetic rate under varying fertilizer treatments remained unchanged, but the biomass improved significantly. In G. robusta , excellent aerial growth was observed despite a low rate of photosynthesis (even at low water potential). The dry weight of Eucalyptus was recorded (60 and 233 t/ha; spacing 1 m × 1 m and 1 m × 0.71 m) after 3 yr. After 10 yr, the highest dry weight was recorded again in Eucalyptus at 1,471.44 t/ha. The lowest moisture content (36–38%) was recorded in Morus alba , while the highest moisture content was recorded in Eucalyptus (66–70%). In all tested species, G. robusta (26%) showed the maximum calorific value.
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