Pauli N.,University of Western Australia |
Donough C.,International Plant Nutrition Institute |
Oberthur T.,International Plant Nutrition Institute |
Cock J.,International Plant Nutrition Institute |
And 7 more authors.
Agriculture, Ecosystems and Environment | Year: 2014
Increasing the yield of existing oil palm plantations is one means of accommodating some of the growing demand for palm oil. The International Plant Nutrition Institute (IPNI) has developed and tested a process to deploy a series of 'best management practices' (BMPs) that cover a range of agronomic practices intended to intensify oil palm production and improve yield at a given site using cost-effective, practical methods. Many of these BMPs include techniques that should also improve soil quality, such as the addition of organic matter to the soil surface, and improved timing and tailored application of mineral and organic fertilisers. Six plantations in Kalimantan and Sumatra applied BMPs prescribed by IPNI (BMP treatment), and standard management practices (REF treatment) in paired blocks of oil palm over four years; 30 pairs of blocks were included in the research. Soils were sampled in both treatments before and after the field trial, from beneath weeded circles surrounding individual palms and beneath frond piles in between rows of palms, at 0-20. cm depth and 20-40. cm depth. Soils were tested for a range of properties, including soil pH, % soil organic carbon (% SOC), total N, available P, and exchangeable cations. No clear, consistent differences were found in the degree of change in soil properties between BMP and REF treatments over four years. However, improvements in some soil properties were noted for both treatments, particularly for soil pH and % SOC. There was no significant deterioration in the measured soil properties over the four years. The results suggest that appropriate management practices for oil palm can improve several aspects of soil quality. Further research on the mechanisms by which BMPs can improve soil quality, and monitoring over longer periods of time is recommended to give plantation managers a clearer picture of the potential 'co-benefits' that can be obtained with adoption of BMPs designed to increase oil palm yield. © 2014 Elsevier B.V.
Ritter E.,NEIKER Technalia |
de Armentia E.L.,NEIKER Technalia |
Erika P.,PT Sampoerna Agro Tbk |
Herrero J.,PT Sampoerna Agro Tbk |
And 7 more authors.
Euphytica | Year: 2016
The shell thickness gene Sh is one of the most important genes in oil palm. It controls the fruit type which in turn is associated with palm oil yield. Based on previous information about Sh alleles, we have developed a molecular marker system which is composed of three primer pairs and the application of two restriction enzymes which allows to discriminate between one dura and two pisifera alleles that are currently known. The different components of this marker system have been validated on 207 dura genotypes and 50 pisifera genotypes of different origins, as well as in 242 tenera genotypes derived from crosses of individual dura and pisifera palms. All evaluated genotypes showed the amplification products or restriction fragments, indicating a general applicability of the proposed system. The results of the application of this molecular marker system were compiled for all potentially existing fruit type genotypes, and can be used conveniently for selecting the desired genotypes or for identifying specific genotypes in mixtures. Methodological details were indicated for applying the marker system, as well as limitations with respect to potentially existing genetic variability. Useful applications of the system for breeding and seed certification are discussed. © 2015, Springer Science+Business Media Dordrecht.