Fertilizer/site interactions on the growth and foliar nutrient levels of Eucalyptus grandis

Dry mass partitioning and nitrogen uptake by Eucalyptus grandis plants in response to localized or mixed application of phosphorus

“…The lower growth of MPT plants became more evident with time, as this depressive effect was seen in the longer experiment (Experiment 2) in which MPT plants grew less than LPT plants (Table 3). The depressive effect of P fertilization was previously reported, and generally attributed to nutrient imbalances, mainly between nitrogen and phosphorus (Barros et al 1990;Herbert 1990;Sands et al 1992). Plants with high availability of only one nutrient in the soil (P in this case) would not be able to grow more because other nutrient is limiting growth (N in this case).…”

Fertilization with phosphorus increases soil nitrogen absorption in young plants of Eucalyptus grandis

“…The effects of P were probably not due to indirect effects on soil N mineralization, since the concentrations of ammonium and nitrate were quite similar in the loamy sand after fertilization with P6 (14.2 mg kg À1 versus 12.6 mg kg À1 of nitrate-N and 0.33 mg kg À1 versus 0.88 mg kg À1 of ammonium-N at 33 DAT, and 7.3 mg kg À1 versus 8.6 mg kg À1 1 of nitrate-N and 0.02 mg kg À1 versus 0.44 mg kg À1 of ammonium-N at 52 DAT, in control and P-fertilized pots, respectively). In soils with moderate organic matter, responses to N and P are not surprising (Herbert, 1990). However, lack of response to N-applications without an adequate supply of P has been widely reported, and even depressive effects on growth have been observed .…”

“…However, lack of response to N-applications without an adequate supply of P has been widely reported, and even depressive effects on growth have been observed . No effect or a depressive effect of P-fertilization might be expected when N status in the soil is very low because P-uptake is strongly influenced by N supply (Herbert, 1990). Increases in total height due to P-fertilization were observed 3 months after planting in soils with an adequate N supply (Xu et al, 2002), and positive responses of growth to P-fertilization have been observed in E. grandis in soils with even higher Pconcentrations than those of the soils used in this experiment (Herbert, 1983).…”

“…If the N:P ratio is lower than the species optimum, defined between 11:1 and 18:1 for E. grandis, a positive response to N-fertilization is expected. On the other hand, if the N:P ratio is higher than optimum, a positive response to P addition is likely to occur (Herbert, 1990).…”

Crescimento, nutrição mineral e eficiência do uso da água em povoamento de eucalipto fertilizado com fontes alternativas ao KCl

“…Assim como a água, a nutrição também é reconhecida como fator limitante no crescimento e desenvolvimento de plantações florestais (NAMBIAR, 1990). Inicialme nte, foram realizados estudos de fertilização com N, P e K, e a disponibilidade de água para as árvores, tendo em vista suas rápidas e significativas respostas em crescimento às aplicações (COLE et al, 1990;HERBERT, 1990). Estudos recentes demonstram que o K é um dos nutrientes que mais afeta a eficiência do uso da água e o crescimento das árvores de eucalipto, bem como as características morfológicas, anatômicas e ecofisiológicas das plantas (BATTIE-LACLAU et al, 2013, 2014a, 2014bCRISTINA et al, 2015).…”