Summary of the effect of fertilizer-phosphorus (P) source on grain 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 MAP and RP, but n = 3 observations for DAP, ECST, TSP, and the UC and n = 2 observations for CPST due to missing data from one dead plant and grain masses that were too low for any chemical analyses.

Table 5: Summary of the effect of fertilizer-phosphorus (P) source on grain 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 MAP and RP, but n = 3 observations for DAP, ECST, TSP, and the UC and n = 2 observations for CPST due to missing data from one dead plant and grain masses that were too low for any chemical analyses.

Plant Property^†	P-value	Fertilizer-P Source^†							Overall mean
Plant Property^†	P-value	ECST	CPST	MAP	DAP	TSP	RP	UC	Overall mean
Grain (kg m^-2)	0.39	1.4	1.4	1.0	0.9	1.6	0.9	1.2	1.2
Grain concentration
N (%)	0.19	1.5	1.3	1.4	1.8	1.3	1.3	1.3	1.4
P (%)	0.77	0.25	0.27	0.28	0.26	0.27	0.26	0.26	0.27
K (%)	0.02	0.69 ab^‡	0.72 a	0.57 c	0.61 bc	0.61 bc	0.67 ab	0.67 ab	-
Mg (%)	0.61	0.13	0.13	0.13	0.12	0.13	0.13	0.13	0.13
Ca (%)	0.11	0.02	0.03	0.03	0.02	0.03	0.04	0.03	0.03
Fe (mg kg^-1)	0.16	18.2	19.6	30.1	23.6	13.0	24.5	34.1	23.3
Mn (g kg^-1)	0.17	0.23	0.27	0.26	0.22	0.27	0.29	0.24	0.25
Zn (mg kg^-1)	0.69	34.4	36.0	35.7	38.9	32.7	39.4	37.5	36.4
Grain uptake
N (g m^-2)	0.24	19.7	21.2	13.5	14.0	21.9	12.2	15.3	16.8
P (g m^-2)	0.26	3.5	3.7	2.7	2.3	4.4	2.4	3.1	3.2
K (g m^-2)	0.40	9.5	10.0	5.7	5.5	10.2	6.3	8.2	7.9
Mg (g m^-2)	0.32	1.8	1.8	1.2	1.1	2.1	1.2	1.6	1.5
Ca (g m^-2)	0.23	0.32	0.43	0.26	0.20	0.49	0.38	0.35	0.35
Fe (mg m^-2)	0.73	24.1	27.2	23.8	18.5	23.1	22.4	29.5	24.1
Mn (g m^-2)	0.40	0.32	0.36	0.26	0.20	0.43	0.26	0.28	0.30
Zn (mg m^-2)	0.20	47.2	51.9	33.6	32.2	53.7	36.7	41.3	42.4

^†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.