Effect of the incubation time of magnesian thermophosphate in the soil and inoculation with arbuscular mycorrhizal fungi in the phosphorus recovery by bahia grass

Ciência Rural

Pessoa, Antônio Carlos dos Santos¹  Kaminski, João²  Rheinheimer, Danilo dos Santos² 

[1] Universidade Federal de Viçosa, Viçosa;Universidade Federal de Santa Maria, Santa Maria

关键词: coarse magnesian thermophosphate;    phosphates;    phosphorus recovery;    bahia grass;    indigenous mycorrhizal fungi;   

DOI  :  10.1590/S0103-84781997000300007

学科分类：农业科学（综合）

来源: Universidade Federal de Santa Maria * Centro de Ciencias Rurais

【 摘 要 】

A greenhouse experiment was carried out at the University of Santa Maria, RS, Brazil, to evaluate the effect of incubation time ofcoarse granulated magnesian thermophosphate in the soil, preceding the seeding, on phosphorus availability for bahia grass (Paspaium notatum Flugge var. saurae) and evaluate the effect ofindigenous arbuscular mycorrhizal fungi (AMf) in the phosphorus recover by bahia grass. The treatments were randomized with four replications, forming incomplete factorial design (3X2X2+8), three incubation times in umid soil of the coarse granulated magnesian thermophosphate preceding the seeding (0,100 and 200 days); twopHvalues (4,8 and liming Io pH 6.0); and with or without inoculation wilh AMf: the contrais Ireatments were without phosphorus and with concentrated superphosphate, both with or wilhoul inoculation and with or without liming. Phosphorus was addedat the rate of l00mg P2O5 kg-1 of soil. It was observed that (a) the thermophosphate incubation time, preceding the seeding of the bahia grass, increased its solubility in soil, however phosphorus availability did not increase as phosphorus availability from concentrated superphosphate; and (b) soil inoculation wilh indigenous AMf increased bahia grass dry matter yield and phosphorus uptake oníy whenplants were submitted to nutritional stress, despite the low colonization micorrhizae.

【 授权许可】

CC BY-NC