| dc.creator | Isenmila, A. E.
43457,
autor.
aut | |
| dc.creator | Omoti, O.
43458. | |
| dc.creator | Oviasogie, P. O.
43459. | |
| dc.date | [2005] | |
| dc.description | Locally available magnesium bearing rocks were evaluated as Mg nutrient source for fertilizing oil palm on an alfisol in Nigeria over a seven year period. Incessant short supply of single element fertilizers (k, P and Mg) coupled with increasing prices prompted the need to evaluate several Mg nutrient bearing rock minerals for their fertilizer values. Two locally available Mg bearing minerals, magnesite (MAG), which is essentially a carbonate (74.2 percent) high in Mg content (22 percent) with low solubility both in water and ammonium acetate (1.05 and 0.094 percent respectively) and dolomite (DOL) were evaluated against tow imported Mg fertilizers, Kieserite (KIE) and calcined magnesite (CMS). Results presented in this paper are from a trial initiated in 1999 on a six-year-old NIFOR EWS tenera oil palm on a Rhodic Paleudualf soil series at Okomu Oil Palm Estate with an annual rainfall of about 2411 mm. The trial was laid out as a split plot in a randomized complete block arrangement (RCBD) with Mg sources as the main plot and the rates as the subplot treatments and replicates three times. Cummulative Fresh Fruit Bunch (FFB) production over a five year period (2000-2005) indicated that all Mg sources increased yield non-significantly by between 15.7 and 23.0 percent respectively compared with the nil treatment. The order being KIE>DOL>MAG>CMS. In 2001 the order was MAG>KIE>CMS>DOL. Although the order was slightly reversed in 2002, FFB produced by palms that received kieserite (17.1 t.ha) was comparable with that produced by palms fertilized with magnesite. Production in plots fertilized with CMS and DOL followed the same pattern (16.2 and 16.8/ha respectively). Non-significant 21.9 and 4.4 percent increases were observed in plots fertilized with MAG and DOL compared with 31.3 and 11.0 percent in KIE and CMS fertilized plots in 2003 respectively. FFB production was increased non-significantly by 11.9, 32.5, 42 and 55 percent in 2004 by MAG, KIE, DOL and CMS respectively. However, Mg sources x rates interaction significantly influenced FFB production particularly in plots fertilized with CMS as FFB production decreased significantly in plots that received 1.5 kg/palm/yr. By the 7th year (2005) from treatment commencement, the mean plot FFB production was not only high (30.0 to 35.0t/ha/yr) but DOL caused the highest increasea averaging 35.0t/ha/yr compared with 33.4, 31 and 30t/ha/yr in plots fertilized with KIE, MAG and CMS respectively. The nil-Mg plots mean FFB yield was 26.7t/ha/yr. Mg sources and rates only slightly increased single bunch weight (SBW) in 2002 and 2005 compared with the nil-Mg plots. On the other hand, Mg sources, rates and Mg sources x rates interactions effected higher increases in mean bunch number (MBN) per palm exerting significant effects in 2003. MBN was increased in treatment plots by between 10-35, 1.3-7.3, 11.1-42.9, 19.2-65.4 and 14.1-30.4 percent in 2001, 2002, 2004 and 2005 respectively. Mg application irrespective of the source and rate generally oncreased soil pH, exchangeable Mg, Ca and available P. Results obtained during the seven year period (1999-2005) showed that the locally sourced Mg fertilizers, magnesite and dolomite were as effective as the imported kieserite and calcined magnesite in enhancing oil palm productivity. However the preference by estates is for magnesite because of its low Ca content and high residual effect. | |
| dc.description | Incluye referencias bibliográficas. | |
| dc.description | Locally available magnesium bearing rocks were evaluated as Mg nutrient source for fertilizing oil palm on an alfisol in Nigeria over a seven year period. Incessant short supply of single element fertilizers (k, P and Mg) coupled with increasing prices prompted the need to evaluate several Mg nutrient bearing rock minerals for their fertilizer values. Two locally available Mg bearing minerals, magnesite (MAG), which is essentially a carbonate (74.2 percent) high in Mg content (22 percent) with low solubility both in water and ammonium acetate (1.05 and 0.094 percent respectively) and dolomite (DOL) were evaluated against tow imported Mg fertilizers, Kieserite (KIE) and calcined magnesite (CMS). Results presented in this paper are from a trial initiated in 1999 on a six-year-old NIFOR EWS tenera oil palm on a Rhodic Paleudualf soil series at Okomu Oil Palm Estate with an annual rainfall of about 2411 mm. The trial was laid out as a split plot in a randomized complete block arrangement (RCBD) with Mg sources as the main plot and the rates as the subplot treatments and replicates three times. Cummulative Fresh Fruit Bunch (FFB) production over a five year period (2000-2005) indicated that all Mg sources increased yield non-significantly by between 15.7 and 23.0 percent respectively compared with the nil treatment. The order being KIE>DOL>MAG>CMS. In 2001 the order was MAG>KIE>CMS>DOL. Although the order was slightly reversed in 2002, FFB produced by palms that received kieserite (17.1 t.ha) was comparable with that produced by palms fertilized with magnesite. Production in plots fertilized with CMS and DOL followed the same pattern (16.2 and 16.8/ha respectively). Non-significant 21.9 and 4.4 percent increases were observed in plots fertilized with MAG and DOL compared with 31.3 and 11.0 percent in KIE and CMS fertilized plots in 2003 respectively. FFB production was increased non-significantly by 11.9, 32.5, 42 and 55 percent in 2004 by MAG, KIE, DOL and CMS respectively. However, Mg sources x rates interaction significantly influenced FFB production particularly in plots fertilized with CMS as FFB production decreased significantly in plots that received 1.5 kg/palm/yr. By the 7th year (2005) from treatment commencement, the mean plot FFB production was not only high (30.0 to 35.0t/ha/yr) but DOL caused the highest increasea averaging 35.0t/ha/yr compared with 33.4, 31 and 30t/ha/yr in plots fertilized with KIE, MAG and CMS respectively. The nil-Mg plots mean FFB yield was 26.7t/ha/yr. Mg sources and rates only slightly increased single bunch weight (SBW) in 2002 and 2005 compared with the nil-Mg plots. On the other hand, Mg sources, rates and Mg sources x rates interactions effected higher increases in mean bunch number (MBN) per palm exerting significant effects in 2003. MBN was increased in treatment plots by between 10-35, 1.3-7.3, 11.1-42.9, 19.2-65.4 and 14.1-30.4 percent in 2001, 2002, 2004 and 2005 respectively. Mg application irrespective of the source and rate generally oncreased soil pH, exchangeable Mg, Ca and available P. Results obtained during the seven year period (1999-2005) showed that the locally sourced Mg fertilizers, magnesite and dolomite were as effective as the imported kieserite and calcined magnesite in enhancing oil palm productivity. However the preference by estates is for magnesite because of its low Ca content and high residual effect. | |
| dc.language | ng | |
| dc.publisher | Benin City : [Publisher not identified], | |
| dc.subject | Magnesio. | |
| dc.subject | Nutrición de las plantas. | |
| dc.subject | nutrición del suelo | |
| dc.subject | Palma de aceite | |
| dc.title | Impact of locally sourced Mg fertilizers on oil palm production in Nigeria : A seven year perspective. | |
| dc.type | text | |
