Background and aims: In oil palm, similar fertilization treatments can result in lea et potassium and magnesium concentrations that vary signi cantly from one progeny to another. This hinders the development of standardized fertilizer recommendations for this crop, as they are usually calculated based on optimum lea et nutrient concentrations.Methods: 4-high-yielding oil palm progenies with contrasting lea et K and Mg concentrations (C1, C2, and C3 of Deli x La Mé origin and C4 of Deli x Yangambi origin) were treated with combinations of 3-levels of KCl and MgSO 4 , in a completely randomized split-plot factorial design with 6-replicates, where progenies were a sub-factor.Results: For a given level of KCl or MgSO 4 , different lea et K and Mg concentrations were found between progenies (p < 0.0001). Lea et K concentration and yield response to KCl applications revealed that the four oil palm progenies have different optimum lea et K concentrations. In our study period (5-8 YAP), progenies C1 and C3 showed their highest fresh fruit bunch (FFB) yields (13.62 and 16.54 t ha -1 year -1 , respectively) at K2, whereas progenies C2 and C4 showed their highest yields (14.62 and 12.39 t ha -1 year -1 , respectively) at K1.
Conclusion:Our study highlighted speci c optimum lea et K and Mg concentrations for different oil palm progenies in a given environment. It paves the way for adopting K and Mg fertilizer application rates adapted to speci c requirements of each type of oil palm planting material.
Oil palm fertilizer requirements are based on leaflet mineral concentrations. Four oil palm progenies representing a wide genetic diversity of Elaeis guineensis species and with contrasting K and Mg leaflet concentrations were tested in Indonesia and Nigeria, environments which differ predominantly in climate. During 5 years, we compared oil palm progenies’ leaflet mineral concentrations between both countries under abundant fertilizer applications to investigate the extent to which they depend on the environment. In the two studied environments, leaflet concentrations significantly differed between progenies for K, Mg and Ca, but the country effect was not found significant (p = 0.352) for any leaflet mineral’s concentration. In both countries, progenies ranked similarly in their mineral categories (lowest and highest cation concentrations within the 4 progenies population), indicating that leaflet mineral concentrations in the tested oil palm progenies are mainly determined by their genetic background. For each progeny, with abundant fertilization, K, Mg and Ca proportions to total leaf cation charge (TLCC) were similar, irrespective of the environments in which the palms were cultivated. We have strong indications that foliar concentrations of K, Mg and Ca are determined by genetic factors which dominate the environmental effect. However, it remains uncertain whether differences in oil palm foliar concentrations between different oil palm progenies imply that they require specific fertilizer amounts to attain an optimal production.
This study presents the draft genome sequences of four strains of rhizobacteria, namely,
Bacillus cereus
ADO11,
Stenotrophomonas maltophilia
NAA11,
Acinetobacter pittii
LAM11, and
Serratia marcescens
NSA15, which were isolated from maize soils and have the ability to stimulate plant growth. The genome assembly sizes for the strains were 4,476,462 bp, 4,731,402 bp, 4,080,875 bp and 4,959,744 bp, respectively.
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