Table 4.

Impact of conventional urea, neem-coated urea, and zinc-coated urea on the concentration of nitrogen in straw and grains, protein contents in grain, and grain water absorption ratio of rice plants grown in aerobic and anaerobic regimes.

Treatments	Nitrogen in straw			Nitrogen in grain
	Aerobic regime	Anaerobic regime	Mean (UF)	Aerobic regimes	Anaerobic regime	Mean (UR)
Control	0.035	0.037	0.036 D	0.89 e	0.95 e	0.92 D
Urea	0.068	0.074	0.071 C	1.00 de	1.16 d	1.08 C
Neem coated	0.123	0.128	0.126 B	1.36 c	1.40 bc	1.38 B
Zn coated	0.445	0.456	0.450 A	1.57 ab	1.63 a	1.60 A
Mean (IR)	0.168 A	0.174 A		1.20 B	1.28 A
HSD	I = 0.007, F = 0.674, IF = NS			I = 0.053, F = 0.01, IF = 0.017
Treatments	Protein in grain			Grain water absorption ratio
	Aerobic regime	Anaerobic regime	Mean (UF)	Aerobic regimes	Anaerobic regime	Mean (UR)
Control	5.80	6.00	5.90 C	2.03	2.33	2.183 B
Urea	6.30	6.16	6.23 C	2.20	2.40	2.30 B
Neem coated	7.20	7.40	7.30 B	2.43	2.56	2.50 AB
Zn coated	7.90	8.33	8.11 A	2.60	2.90	2.75 A
Mean (IR)	6.80 B	6.97 A		2.31 B	2.55 A
HSD	I = 0.418, F = 0.674, IF = NS			I = 0.173, F = 0.331, IF = NS

IR, irrigation regimes; UF, urea fertilizers; mean values having the same alphabet did not differ significantly at p = 0.05.