Response oiPinus radiata (D. Don) to boron fertilisation under greenhouse conditions

摘要

We studied the effect of different fertiliser boron (B) levels on growth, B uptake and photosynthesis of Pinus radiata and soil dehydrogenase activities under greenhouse conditions. Boron concentration in needle, stem and roots increased with increasing rates of B fertiliser. Boron at 4-8 kg/ha increased growth and net photosynthetic rate. However, higher rates reduced net photosynthetic rate and diameter growth. Soil dehydrogenase activity, an indicator of soil microbiological activities, was significantly reduced by B application at the rate of 16 and 32 kg/ha. Our findings confirm the narrow range between B deficiency and toxicity in a tree crop.