Summary of the effect of fertilizer-phosphorus (P) source on belowground tissue properties for rice grown in a P-deficient, silt-loam soil under flood-irrigated conditions in the greenhouse. Least square means are reported, with n = 4 observations for each fertilizer-P source treatment, expect for ECST, for which n = 3 observations due to missing data from one dead plant.

Table 3: Summary of the effect of fertilizer-phosphorus (P) source on belowground tissue properties for rice grown in a P-deficient, silt-loam soil under flood-irrigated conditions in the greenhouse. Least square means are reported, with n = 4 observations for each fertilizer-P source treatment, expect for ECST, for which n = 3 observations due to missing data from one dead plant.

Plant Property^†	P-value	Fertilizer-P Source^†							Overall mean
Plant Property^†	P-value	ECST	CPST	MAP	DAP	TSP	RP	UC	Overall mean
Belowground DM (kg m^-2)	0.04	0.79 bc^‡	0.62 c	1.4 a	0.89 abc	1.1 ab	0.82 bc	0.72 bc	-
Belowground DM concentration
N (%)	0.32	0.98	1.27	0.95	1.32	1.02	0.98	0.86	1.05
P (%)	0.03	0.09 b	0.12 a	0.08 b	0.09 b	0.09 b	0.10 ab	0.09 b	-
K (%)	0.06	0.09	0.09	0.12	0.08	0.07	0.16	0.12	0.10
Mg (%)	< 0.01	0.09 cd	0.10 bc	0.08 cd	0.08 d	0.10 bc	0.13 a	0.11 ab	-
Ca (%)	0.01	0.29 bc	0.52 a	0.22 c	0.32 b	0.35 b	0.32 bc	0.33 b	-
Fe (g kg^-1)	0.20	33.6	49.8	35.7	45.7	48.1	44.6	38.5	42.3
Mn (g kg^-1)	0.01	2.1 bc	3.0 a	1.5 c	2.4 ab	2.7 ab	2.5 ab	2.3 ab	-
Zn (mg kg^-1)	0.16	43.8	48.6	33.2	44.8	46.2	44.5	36.3	42.5
Belowground DM uptake
N (g m^-2)	0.03	7.1 bc	7.3 bc	14.1 a	9.1 ab	9.2 ab	7.9 bc	5.4 c	-
P (g m^-2)	0.06	0.64	0.71	1.23	0.74	0.92	0.81	0.63	0.81
K (g m^-2)	0.01	0.66 bc	0.57 c	2.0 a	0.68 bc	0.86 bc	1.3 ab	0.90 bc	-
Mg (g m^-2)	0.12	0.73	0.61	1.2	0.71	1.1	1.0	0.81	0.89
Ca (g m^-2)	0.45	2.2	2.7	3.1	2.4	3.5	2.6	2.0	2.6
Fe (g m^-2)	0.16	26.6	32.5	50.0	37.5	50.1	35.6	25.7	36.9
Mn (g m^-2)	0.28	1.7	1.8	2.1	1.9	2.9	2.1	1.5	2.0
Zn (mg m^-2)	0.04	35.2 ab	28.1 b	45.5 a	36.4 ab	47.6 a	35.3 ab	25.5 b	-

^†Dry matter (DM), electrochemically precipitated struvite (ECST), chemically precipitated struvite (CPST), monoammonium phosphate (MAP), diammonium phosphate (DAP), triple superphosphate (TSP), rock phosphate (RP), and unamended control (UC); ^‡Means in a row followed by different letters are different at P ≤ 0.05.