. 2025 Mar 28;16:1521113. doi: 10.3389/fpls.2025.1521113

Table 5.

Effects of irrigation on the bioavailable Se concentration in different soil layers at harvest in two seasons.

Seasons	Treatments	Bioavailable Se concentration (μg·kg^-1) (0–20-cm)
		BGW-1		BGW-2
		Se₀	Se₂₁₆₀	Se₀	Se₂₁₆₀
2018-2019	W₀	16.87 ± 1.31^Ab	63.88 ± 1.12^Aa	16.79 ± 1.18^Ab	65.62 ± 0.95^Aa
	W₁	16.63 ± 1.14^Ab	56.17 ± 1.07^Ba	16.48 ± 1.11^Ab	58.17 ± 1.06^Ba
	W₂	16.40 ± 1.37^Ab	44.34 ± 1.63^Ca	16.31 ± 1.49^Ab	47.26 ± 1.69^Ca
2019-2020	W₀	17.03 ± 1.31^Ab	64.48 ± 1.29^Aa	16.95 ± 1.50^Ab	66.01 ± 1.40^Aa
	W₁	16.69 ± 1.16^Ab	57.33 ± 1.75^Ba	16.82 ± 1.26^Ab	58.91 ± 1.08^Ba
	W₂	16.78 ± 1.41^Ab	46.17 ± 1.19^Ca	16.66 ± 1.65^Ab	48.33 ± 1.35^Ca
		Bioavailable Se concentration (μg·kg^-1) (20–40-cm)
2018-2019	W₀	10.89 ± 1.22^Aa	11.84 ± 1.36^Aa	10.38 ± 1.31^Aa	11.40 ± 1.44^Aa
	W₁	10.67 ± 1.43^Aa	11.73 ± 1.57^Aa	10.08 ± 1.56^Aa	10.97 ± 1.63^Aa
	W₂	10.38 ± 1.11^Aa	11.61 ± 1.26^Aa	9.79 ± 1.10^Aa	10.84 ± 1.25^Aa
2019-2020	W₀	10.78 ± 1.29^Aa	12.06 ± 1.46^Aa	10.46 ± 1.51^Aa	11.72 ± 1.71^Aa
	W₁	10.49 ± 1.69^Aa	11.83 ± 1.71^Aa	10.25 ± 1.13^Aa	11.34 ± 1.29^Aa
	W₂	10.41 ± 1.08^Aa	11.71 ± 1.27^Aa	10.08 ± 1.27^Aa	11.23 ± 1.41^Aa

Values with different capital letter in the same column are significantly different (α = 0.01). Values with different small letters in the same row are significantly different (α = 0.05). W₀, no irrigation throughout the entire growing period; W₁, irrigated at the wintering stage (Feekes 3.0); W₂, irrigated at both the wintering and greening stage (Feekes 4.0); Se₀, no Se fertilizer; Se₂₁₆₀, 2160 g·ha^-1 pure Se; BGW-1, black-grained wheat Xihei 88; BGW-2, black-grained wheat Heidali.