TABLE 4.

Correlation of nutrient value of soybean grains with the number of effective root nodules, acid phosphatase activity in the rhizosphere, and plant available phosphorus in soil.

Nutrient contents	Number of effective nodules	Acid phosphatase activity	Plant available phosphorus in soil
of soybean grains	r values	r values	r values
Carbohydrate	0.87***	0.61***	0.41*
Protein	0.46**	ns	0.46*
Zinc	0.59***	ns	ns
Iron	0.77**	ns	ns

Values are significant at *p < 0.05, **p < 0.01, and ***p < 0.001; ns, not significant.