Soil fertility status of 20 seed production areas of Tectona grandis Linn. f. in Karnataka, India
2011
Gunaga, R.P., Dr. Balasaheb Sawant Konkan Krishi Vidyapeeth, Dapoli (India). Coll. of Forestry | Kanfade, A.H., Conservator of Forest , Agartala (India) | Vasudeva, R., Coll. of Forestry, Sirsi (India)
The seed production area (SPA) is an improved plantation managed for production of quality seeds for a large-scale plantation programme. The present study was undertaken in 20 seed production areas located in different seed zones of Karnataka, South India. Our results showed that there was a greater variation among SPAs in various soil properties like soil pH, organic carbon, available NPK. Some of the studied variables recorded significant variations among three different depths as follows: 0-20 (top), 20-40 (middle) and 40-60 cm (bottom). For instance, organic C and available K showed significant variations at different depths, where the highest content was recorded in the top layer, followed by middle and bottom layers. Considering associations between soil properties and tree growth, organic C was positively associated with the diameter at breast height; r = 0.500), stem roundness (r = 0.351) and stem volume (r = 0.250). Similarly, available N positively influenced the stem volume (r = 0.250). Though the fruit yield varied among SPAs, none of the studied soil characteristics showed a significant influence on fruit yield indicating that some other factors might control it. Data on site quality showed that all existing SPAs studied were growing in poor site conditions, however, this could be one of the factors affecting overall seed yield among SPAs.
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