High phosphorus availability promotes the diversity of arbuscular mycorrhizal spores’ community in different tropical crop systems

The relationship between mycorrhizal colonisation and phosphorus acquired by seedlings of the arbuscular mycorrhizal tree Oubanguia alata Bak f. (Scytopetalaceae) and the ectomycorrhizal tree Tetraberlinia moreliana Aubr. (Caesalpiniodeae) was evaluated at low and high inorganic phosphorus availability. AM colonisation was positively correlated with phosphorus uptake by O. alata at low, but not at high phosphorus availability. Seedlings growth was positively related to arbuscular mycorrhizal colonisation at both low and high phosphorus availability, suggesting that growth promotion by arbuscular mycorrhizas is not simply related to an increase of phosphorus uptake. In contrast, phosphorus uptake by T. moreliana was correlated with EM colonisation at both low and high phosphorus availability, but there was no relationship between growth and ectomycorrhizal colonisation. Promotion of phosphorus uptake by arbuscular mycorrhizas and ectomycorrhizas at low phosphorus availability is consistent with the co-occurrence of the two types of mycorrhiza in tropical rain forests where available soil phosphorus is low. However, ectomycorrhizal colonisation may also be of advantage where inputs of phosphorus rich litter raise the phosphorus status of the soil, as seen in the groves of ectomycorrhizal trees in Korup National Park, and may be one of the factors reinforcing local dominance by these trees.

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Soil phosphorus availability is a driver of the responses of maize (Zea mays) to elevated CO2 concentration and arbuscular mycorrhizal colonisation

Symbiosis ◽

10.1007/s13199-018-0573-0 ◽

2018 ◽

Vol 77 (1) ◽

pp. 73-82 ◽

Cited By ~ 3

Author(s):

Stephanie J Watts-Williams ◽

F Andrew Smith ◽

Iver Jakobsen

Keyword(s):

Zea Mays ◽

Elevated Co2 ◽

Soil Phosphorus ◽

Arbuscular Mycorrhizal ◽

Co2 Concentration ◽

Phosphorus Availability ◽

Elevated Co2 Concentration ◽

Mycorrhizal Colonisation

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Corrective and maintenance phosphorus fertilization on sugarcane yield in Oxisols

Pesquisa Agropecuária Brasileira ◽

10.1590/s1678-3921.pab2021.v56.02160 ◽

2021 ◽

Vol 56 ◽

Author(s):

Thomaz Adolpho Rein ◽

João de Deus Gomes dos Santos Junior ◽

Djalma Martinhão Gomes de Sousa ◽

Wellington Pereira de Carvalho ◽

Gabriel de Castro Lemes

Keyword(s):

Soil Phosphorus ◽

Phosphorus Availability ◽

Cane Yield ◽

Phosphorus Fertilization ◽

Saccharum Spp ◽

High Phosphorus ◽

Sugarcane Yield

Abstract The objective of this work was to evaluate sugarcane (Saccharum spp.) yield in response to corrective and maintenance phosphorus fertilization in Oxisols. Two experiments were carried out in randomized complete blocks with four replicates. In the corrective fertilization treatments, 150 kg ha-1 P2O5 were broadcast and incorporated before planting. In the maintenance fertilization treatments, 40 kg ha-1 P2O5 per year were applied over the trash blanket. All treatments, except the control, were fertilized with 170 kg ha-1 P2O5 in the planting furrow. The first experiment was carried out in a sugarcane expansion area and the second, in a replanting area, in Oxisols with a low and high phosphorus availability, respectively. In the first experiment, corrective fertilization increased cane yield in 13.4 Mg ha-1 for plant cane and in 14.6 Mg ha-1 for the average of four ratoon crops, whereas maintenance fertilization increased yield in 17.7 and 8.1 Mg ha-1 for the average of four ratoon crops for the treatments without and with corrective fertilization, respectively. In the second experiment, there were no significant differences between treatments regarding yield. Corrective and maintenance phosphorus fertilization should be considered for sugarcane in areas where soil phosphorus availability is limiting.

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