Response to integrated soil fertility management (ISFM) of hybrid coconut grown on an inland soil of South Cotabato, Philippines
1994
Margate, R.Z. | Mantiquilla, J.A. | Magat, S.S. (Philippine Coconut Authority, Bago Oshiro, Davao City (Philippines). Davao Research Ceter)
A study to assess the effect of organic fertilizer in comparison with inorganic fertilizers and their combination on MAWA hybrid coconut was conducted at Polonuling, Tupi, South Cotabato [Philippines] from 1985 to 1993. The application of 1.0 kg (NH4)2 SO4 + 1.8 kg NaCl + 1.5 kg CaMgCO3 or the higher dosage (2x) resulted in consistent significant (P0.01) increase in nut production, weight of copra per nut and per tree over the 8 yr. period. Yields of coconut applied with corn cob alone (as organic fertilizer) did not vary with the control. But corn cob combined with Cl (NaCl) gave 34-62 percent increases in nut yield, 16-27 percent in copra weight per nut and 67-68 percent in copra yield per tree even as early as the 1st year of production. Clearly, the improvement in yield was due mainly to the correction of Cl and N deficiencies of the palms. Two fertilizer recommendations were possible based on yield and profit: 1.) lower dosage of 1.0 kg (NH4)2 SO4 + 1.8 kg NaCl and 2.) 10 kg corn cob + 1.8 kg NaCl. These findings could be applied in areas with similar environmental conditions as in this study and several other coconut populations in the country
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