Response of rain tree (Samanea saman (Jacq.) Merr.) and kamachile (Pithecellobium dulce (Roxb.) Benth.) to phosphorus and nitrogen fertilization in Bayombong soil
1990
Castaneto, Y.T.
Samanea saman and Pithecellobium dulce responded favorably to varying levels of phosphorus fertilizer. Significant differences were observed in all the growth variables except for root biomass and total biomass. Application of phosphorus at 60-90 kg/ha gave the best growth for the two species studied. Rain tree fertilized with 200 kg N/ha gave significantly taller seedlings, higher shoot biomass, total biomass, and nitrogen uptake that those fertilized with lower nitrogen levels and the control. On the other hand, kamachile did not yield significant difference in growth parameters which could be attributed to the application of nitrogenous fertilizer except in nitrogen uptake at 75 kg N/ha. Independent of nitrogen fertilization, Kamachile seedlings increased in height up to 135.52% more than rain tree seedlings. Rain tree had bigger diameter and higher root/shoot ratio by 28.45% and 11.08% respectively than kamachile. Biomass production of kamachile also improved by 11.22% in shoot and 8.60% total biomass than rain tree. Nodule production of kamachile was 24.45% higher than rain tree. In terms of nodule oven-dry weight, rain tree has 662.87% increased over kamachile. There was a remarkable increase in nitrogen content and uptake of rain tree as high as 231.12% and 106.85%, respectively. Inoculation with effective Rhizobium strain of rain tree independent of fertilizer levels significantly increased diameter, root biomass, shoot biomass, total biomass, nodule oven-dry weight, and nitrogen uptake. Nitrogen application independent of inoculation also gave significant increases in height, diameter, root biomass, shoot biomass, and total biomass of rain tree see
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