Edaphic factors as related to productivity and nutrient uptake of Kauayan tinik (Bambusa blumeana, Schultes F.) in Bukidnon [Philippines]
1997
Tiongco, L.E.
The kauayan tinik clumps in the highly productive site (footslope, 5-10 percent) developed fast and yielded an average of 26.7 culms/clump of large-size and superior quality. The fresh biomass of 826.42 kg/clump was composed of 7.58, 20.43, and 76.97 percent of leaves, branches and culms, respectively. Conversely, clump development was very slow in the marginal site (hillside, 100 percent slope) producing only about 8.0 culms and 62.87 fresh biomass/clump eight years after planting. Regardless of site, the concentration of N, P, K, Ca and Mg was greater in the leaves than in the branches and in the culms. However, the culms accumulated 50 percent of the total nutrient uptake because it comprised 75 percent of the total aboveground biomass. The relative humidity and soil pH had regulated the productivity of Kauayan tinik in Bukidnon [Philippines]. Biomass production and culm basal diameter/height are exponentially related. Positive logarithmic relationships occurred between the culm/biomass production and culm height/soil pH/available P/exchangeable cations (K+, Ca++, Mg++)/CEC. Culm/biomass production was negatively correlated with the relative humidity and soil N. Results strongly indicated that the high productivity of kauayan tinik clumps was mainly due to low clay content and suitable soil pH. The highly productive site is potentially sustainable due to its early and relatively fast clump development. The properties and conditions of the soil in the area are therefore ideal for bamboo production. Conversely, the relatively poor productivity of the species in the marginal site was attributable to very low pH, aluminum toxicity, very steep slope, and high clay content
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