Results of long-term K and Mg fertilizer experiments in afforestation |
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Institution: | 1. Department of Chemical Sciences, Faculty of Science and Technology, Universiti Kebangsaan Malaysia (UKM), 43600 UKM Bangi, Selangor, Malaysia;2. Southeast Asia Disaster Prevention Research Initiative (SEADPRI), Institute for Environment and Development (LESTARI), Universiti Kebangsaan Malaysia (UKM), 43600 UKM Bangi, Selangor, Malaysia;3. Solar Energy Research Institute (SERI), Universiti Kebangsaan Malaysia (UKM), 43600 UKM Bangi, Selangor, Malaysia |
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Abstract: | Results from long-term fertilizer experiments on Scots pine (Pinus sylvestris) planted on old arable land in the north-eastern German lowlands demonstrate the necessity for fertilization with KMg on poorly buffered sandy soils.Applying KMg to young Scots pine increased pole production over a 60 year period by a total of 129 m3 ha?1 (26%). In other experiments the improvement was as much as 93%.KMg manuring on light soils ensures optimal K and Mg nutrition and creates the conditions for uninterrupted growth and healthy development of the plantation. On degraded soils, KMg treatment leads to improved utilisation of the low soil nitrogen supply.With increasing eutrophication due to atmospheric nitrogen, KMg fertilization overcomes the depletion of soil cations and resulting imbalance in tree metabolism.Adequate application of KMg is a prerequisite for success in underplanting with beech (Fagus silvatica) on soils with a land use classification below 30, increasing the growth in height of beech by about 30%.KMg fertilizer favours biomass production and thus the fixation of N deposited through the atmosphere by the vegetation. Thereby, KMg fertilizer use and other silvicultural measures reduce the negative effects of atmospheric N-input in forest ecosystems to a certain extent, especially the N-pollution of groundwater. However, they cannot replace the technologies to reduce the N emissions. |
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