Mycorrhization, growth and nutrition of Pinus halepensis seedlings fertilized with different doses and sources of nitrogen |
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Authors: | Gisela Diaz Catalina Carrillo Mario Honrubia |
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Institution: | 1. Depto. Biología Aplicada, Botánica, Univ. Miguel Hernández, Avda. Universidad s/n, 03202, Elche, Alicante, Spain 2. Depto. Biología Vegetal, Botánica, Univ. Murcia, Campus Espinardo, 30100, Murcia, Spain
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Abstract: | ? Although fertilization is commonly used in nurseries, the effects of high level of nitrogen on Pinus halepensis mycorrhization are still unknown. ? The effect of fertilization at different N levels (low-LN: 35 mg/plant; medium-MN: 60 mg/plant; high-HN: 120 mg/plant), differing N sources (ammonium-(NH4)2SO4; nitrate-HNO3; ammonium+nitrate-NH4NO3) and inoculation with Pisolithus tinctorius and Lactarius deliciosus on the mycorrhization, growth and nutrient status of P. halepensis has been studied. ? P. tinctorius 3SR showed higher mycorrhizal ability (100% of mycorrhizal seedlings) than L. deliciosus (nearer to 50%). The application of increasing doses of N resulted in a significant reduction of mycorrhizal seedlings but no differences were observed between NH4 and NO3as N source at the 60 mg N/plant dose applied. The effects of fertilization on growth were mainly observed in uninoculated plants. The use of NH4 increased growth in non-mycorrhized plants. Nutrient status was similar in all cases except for K concentration, which was higher in plants mycorrhized with P. tinctorius. Interactions between inoculation and fertilization were found, mycorrhizal effects appearing only at LN fertilization. ? It is advisable to avoid high doses of N fertilization in order to produce mycorrhizal P. halepensis seedlings. |
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