Optimum range of soil phosphorus fertility needed for effective arbuscular mycorrhizal inoculation of Welsh onions in a non-allophanic Andosol

Figures & data

Table 1. Effect of arbuscular mycorrhizal fungal inoculation on marketable yield of Welsh onions at different phosphorus fertility and fertilization levels

Treatment			Marketable Yield (g/m^2) ^#3		ANOVA^#4
Site*	P fertilizer ^#1 (g P2O5 m^−2)	Available P ^#2 (mg P2O5 kg^−1)	Control	Inoculation	Inoculation	P fertilizer	reference
VH1	0	1205	3,587	3,579	ns	-	Suzuki et al. (2015)
VH2	20	780	3,027	3,065	ns	-	Suzuki et al. (2015)
	0	158	2,743	3,334	**	ns
H	50	180	2,786	3,204			Akyol et al. (2019)
	100	209	2,977	3,107
M	0	77	2,248	2,443	*	ns	this study
	100	129	2,350	2,974
L	50	38	2,147	2,254	ns	ns	this study
	100	61	2,418	2,636

* VH: very high, H: high, M: medium, L: low.

#1 Superphosphate was broadcasted as basal application with N and K fertilizers and incorporated with a rotary cultivator before transplanting.

#2 Truog method. Soil samples were collected 3–4 weeks after transplanting.

#3 See text.

#4 *<P = 0.05, ** <P = 0.01.

Figure 1. The relationship between mycorrhizal inoculation responsiveness and available soil phosphate. Bars indicate standard errors. Standard error was calculated by replicate data of inoculated treatment (M) versus average data of the control (C). Asterisks indicate the plots with yields of 3,000 g m⁻² or higher relative to the target yield

Suzuki, T., R. Tajima, S. Hara, T. Shimizu, T. Uno, T. Ito, and M. Saito. 2015. “Effect of Arbuscular Mycorrhizal Fungal Inoculation on the Growth of Welsh Onion in Soil Rich in Available Phosphate, and Characterization of Indigenous Arbuscular Mycorrhizal Fungi Isolated from the Soil.” Soil Microorganisms 69: 48–57. doi:10.18946/jssm.69.1_48.

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Akyol, T. Y., R. Niwa, H. Hirakawa, H. Maruyama, T. Sato, T. Suzuki, A. Fukunaga, et al. 2019. “Impact of Introduction of Arbuscular Mycorrhizal Fungi on the Root Microbial Community in Agricultural Fields.” Microbes and Environments 34: 23–32. doi:10.1264/jsme2.ME18109.

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