In the double planting scheme, ubod produced increased very slightly (only about 0.2 kg/palm from3rdto 4thyr of planting (i.e. the 1stand 2ndubod harvesting). These results indicate that there is no need towait for the 4thyr for all young palms to be harvested since these palms have reached the optimum weightand length for a profitable net return. Besides, younger palms are a better source of ubod than older palms(Cinco and Pugoy, personal communication, 1997).This result was corollary to that of Protacio and Ruanes (1995) except that their time of harvestingubod was 2 yr from planting and the distance of planting young coconuts in open field was much closer toeach other (1 m2x 1 m2). In our present planting distance, the smaller palms are allowed to grow biggerdue to more space despite two plants per hill. Hence, heavier and longer ubod were produced.On a per hectare basis, total ubod yield was higher in double planting (average of 4,452 kg/ha/yr)compared to single planting with 2,467 kg/ha/yr. This was mainly due to the double planting density ofyoung coconuts (1,484 palms/ha) in contrast to 742 palms in single planting scheme.Economic analysisUbod production. Under single planting scheme, young underplants showed a total ubod yield of2,522.8 and 2,411.5 kg/ha on the 1stand 2ndyr of harvest (3rdand 4thyr from planting). While there was noyield of ubod on the 1stand 2ndyr of planting, the net income from 3rdand 4thyr could compensate for the
net loss incurred in the previous years (Table 6a). Hence, on a yearly basis, single planting scheme couldgenerate an average net income of PhP 17,156 with an average return on investment of 163%.Compared to single planting, the double planting scheme produced higher net income of PhP129,030in 4 yr or an average yearly net income of PhP 32,258 with ROI of 180% (Table 6b).Copra production. A positive ROI was obtained for 4 yr from copra production of bearing palms(Table 7). As a result of slightly higher yield attributes of bearing palms with double underplanting, aslightly higher average net income was recorded for this scheme (PhP 28,669/ha/yr) as compared to PhP28,028/ha/yr from single planting. Consequently, a slightly higher ROI was incurred from double plantingscheme.Cumulative copra and ubod production. Cost and return analyses for combined copra and ubodproduction from bearing and young coconuts, respectively, revealed an encouraging ROI from the twoplanting schemes (Table 8). Both schemes in combination with copra production indicated a 202% - 203%ROI. The higher net income and ROI obtained in double planting could be attributed to better yield ofbearing palms brought by the benefits obtained from double fertilization of young coconuts, and to thehigher number of palms harvest for ubod production.