Growth, yield and benefit-cost analyses of Kauayan-tinik (Bambusa blumeana J.A. & J.H. Schultes) and bayog [Dendrocalamus merrillianus (Elm.] plantations as influenced by NPK fertilization and some site factors in Ilocos Norte, Philippines
2001
Agustin, J.T.
It was found out that fertilization did not significantly affect the nutrient status of the soil. Soil fertility level of the fertilized clumps was comparable with the soil fertility of unfertilized clumps with the final observation period. Furthermore, growth and yield of Kauayan-tinik and bayog were not significantly affected by fertilization. The insignificant effect may be due to limiting rainfall and soil moisture when the study was conducted. El Niño phenomenon struck the area and there was a series of interspersed dry spells. Findings showed thata number of shoots (NS) of Kauayan-tinik and bayog can be predicted by rainfall. A strong and positive correlation existed between rainfall and NS. Moreover, clumps diameter of Kauayan-tinik and bayog, culm diameter of Kauayan-tinik, and number of culms (NC) of bayog can be predicted by the combined effects of soil pH and organic matter content (OM). OM and pH were found to be strongly and negatively correlated with the aformentioned growth variables. This indicates that soil pH beyond the optimal acidity for bamboos (pH 5-6.5) is already critical to the growth of bamboos in Ilocos Norte, Philippines and a further increase would significantly decrease their growth. The inverse relationship of OM with the aforementioned growth variables contradicted with the expected positive correlation. The NC of Kauayan-tinik can be predicted by the combined effects of pH, OM and K. Soil pH and OM were strongly and negatively correlated with NC while K was found to be strongly and positively correlated with NC. It was found that, unlike in the case of bayog, bigger diameter culms are more intensified as Kauayan-tinik grows and matures. Establishing Kauayan-tinik and bayog plantations is a lucrative venture. Comparing the profitability of the two plantations, however, that of the Kauayan-tinik had higher Net Present Value (NPV) of P 8,379.00) Benefit Cost Ratio (BCR) of 1.10, and Internal Rate of Return (IRR) of 23.46 percent. The bayog plantation can only attain an NPV of P 3,282.68, a BCR of 1.04, and IRR of 23.46 percent.
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