Potassium and Magnesium in Leaf and Top Soil Affected by Triple Superphosphate Fertilisation in an Acacia Mangium Plantation

Abstract

Since nutrients have either synergetic or antagonistic effects, fertilisation has potential to change harvest export of other nutrients present in plantations. In the present research, we investigated the effects of triple superphosphate (TSP) fertilisation on Mg and K contents of leaf and soil pools in a monoculture Acacia mangium plantation in South Sumatra, Indonesia. TSP fertilisation reduced leaf K concentration, but leaf K content per stand area did not show any difference between control and fertilised plots because of the offset by stimulated biomass increment following fertilisation. TSP fertilisation significantly elevated both leaf Mg concentration and leaf Mg content per stand area, indicating the stimulated Mg uptakes by trees. Despite the stimulated uptakes, soil Mg pools were not affected by the fertilisation. It was possibly because the decrease in soil Mg pools during the experimental period was much greater than the stimulated Mg uptakes deriving from the fertilisation. Although the soil nutrient pools were not affected by TSP fertilisation in the present study, our results of the increased leaf Mg contents and the estimated future harvest export of Mg suggest that unbalanced fertilisation can accelerate nutrient export from plantation soils through harvesting.

Interaction of Fertilization and Weed Control Influences on Growth, Biomass, and Carbon in Eucalyptus Hybrid (E. pellita × E. brassiana)

“…Thus this nutrient was more available for eucalyptus hybrid. Several references also evidenced a positive effect of fertilization on phosphorus availability (Barbieri et al, 2014;Tng et al, 2014;González-García et al, 2016;Mori et al, 2018). The second reason was strongly correlated to the age of the stand.…”

“…Those processes were done by referring to the guide for soil, plant, and water analysis methods (Estefan et al, 2013). Figure 1 Study area of eucalyptus plantation located in South Sumatera (Mori et al, 2018). Data collection and analysis In this article, the observation was focused on the growth, biomass, and carbon storage in eucalyptus hybrid at two years.…”