Tropical Legume Crop Rotation and Nitrogen Fertilizer Effects on Agronomic and Nitrogen Efficiency of Rice

Table 3

Nitrogen fixation of bush bean, long bean, mung bean, and winged bean as affected by nitrogen fertilizer.

Nitrogen		Nitrogen fixation (%)
(g/m^2)		Bush bean		Long bean		Mung bean		Winged bean
2010	2011	2010	2011	2010	2011	2010	2011	2010	2011
0	0	29.4^a	28.8^a	24.4^a	25.1^a	22.1^a	24.1^a	42.1^a	41.4^a
2	0	19.2^b	22.2^b	14.2^b	16.8^b	13.3^b	18.0^b	33.4^b	37.4^a
4	0	16.5^c	16.1^c	11.9^c	12.5^c	9.2^c	11.8^c	29.4^b	31.8^b
6	0	9.9^d	13.2^d	5.8^d	9.5^d	3.1^d	8.6^d	21.7^c	29.5^b

Means followed by the same letters are not significantly different for each treatment mean (𝑃<0.05).