Wheat (Triticum aestivum L.) response to combined organic and inorganic phosphorus fertilizers application under saline conditions

Figures & data

Table I. Selected characteristics of the soils and manure used for the study.

	Soils
Properties	Sandy	Masatsuchi	Paddy	Manure
Total C (g kg^−1)	0.03	3.00	3.01	310.3
Total N (g kg^−1)	Traces	0.10	0.32	20.6
Total P (g kg^−1)	Traces	Traces	0.06	3.9
EC (1:5) dSm^−1	0.01	0.11	0.12	9.6
pH (1:5)	6.7	6.6	6.4	9.1
Exchangeable cations (cmolc kg^−1)
Ca	0.15	0.90	74.9	13.0
Mg	0.03	0.80	15.9	12.3
Na	0.03	0.17	1.2	43.3
K	0.91	0.40	11.3	142.3
Texture^1	S	LS	SL	–
^1S: sandy; LS: loamy sand; SL: silt loam.

Figure 1.  Effect of P sources and salt types on shoot, root dry matter (g pot⁻¹) and shoot-root dry matter ratio. Po = organic P source, Pi = inorganic P source and Pc = ½Po + ½Pi.

Table II. Summary of two-way analysis of variance for different parameters studied.

Treatment	Shoot dry weight (g)	Root dry weight (g)	Shoot-root ratio	Shoot P uptake (mg DW^−1)	Root P uptake (mg DW^−1)	Total plant P uptake DW^−1	P recovery (%)	Water soluble P in post-harvest soil (mg kg^−1)
	F-value
P source (P)	141.0**	29.0**	NS	21.5**	9.0**	18.1**	NS	91.2**
Salt type (S)	179.2**	104.6**	29.7**	16.0**	18.2**	18.6**	20.0**	5.1*
P×S	24.1**	13.0**	4.2*	4.1**	4.2*	3.7*	NS	6.4**
* and ** denote significance level at p<0.05 and p<0.01 respectively. NS: not-significant.

Figure 2.  Effect of different P sources and salt types on root, shoot and plant P uptake (mg DW⁻¹). Po = organic P source, Pi = inorganic P source and Pc = ½Po + ½Pi.

Figure 3.  Effect of different P sources and salt types on soil P fractions. Po = Organic P source, Pi = Inorganic P source and Pc = ½Po + ½Pi.