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

Table 9

Grain yield of rice as affected by N fertilizer and legume residues.

N (g m^−2)		Yield (g m^−2)
		Rice after bush bean		Rice after long bean		Rice after mung bean
2010	2011	2010	2011	2010	2011	2010	2011
0	0	424.5^c	358.3^c	416.9^c	403.9^c	407.2^c	395.7^c
		(−21)	(−33)	(−22)	(−25)	(−24)	(−26)
4	0	495.1^b	439.7^b	501.6^b	472.3^b	495.1^b	449.2^b
		(−7)	(−18)	(−6)	(−12)	(−7)	(−16)
8	0	547.2^a	472.3^ab	537.5^a	495.1^ab	540.0^a	488.7^a
		(+2)	(−12)	(+1)	(−7)	(+1)	(−8)
12	0	553.7^a	521.2^a	570.0^a	537.5^a	565.3^a	521.2^a
		(+4)	(−2)	(+7)	(+1)	(+6)	(−2)
N (g m^−2)		Yield (g m^−2)
		Rice after winged bean		Rice after corn		Rice after fallow
2010	2011	2010	2011	2010	2011	2010	2011
0	0	537.5^b	508.1^b	348.5^d	293.2^d	371.3^c	342.0^c
		(+1)	(−5)	(−35)	(−45)	(−31)	(−36)
4	0	645.0^a	602.6^a	407.2^c	358.3^c	488.6^b	423.5^b
		(+21)	(+13)	(−24)	(−33)	(−8)	(−21)
8	0	667.8^a	625.4^a	472.3^b	407.2^b	534.2^a∗	472.3^a
		(+25)	(+17)	(−12)	(−24)	(100)	(−12)
12	0	684.0^a	658.0^a	508.1^a	439.7^a	553.7^a	504.9^a
		(+28)	(+23)	(−5)	(−18)	(+4)	(−5)

Means followed by the same letters are not significantly different for each treatment means (𝑃<0.05).
∗Parenthesis values denote yield increase (+) or decrease (−) in percent; values are calculated based on rice after fallow with 8 g N m⁻² (100%).