Modified Application of Nitrogen Fertilizer for Increasing Rice Variety Tolerance toward Submergence Stress

Table 5

The fertilizing effect for two rice varieties on several yield components at condition of dirty water submergence stress.

Treatment	Inpara 5			IR64
	1	2	3	1	2	3
N0	130.8	93.0	2.39	128.5	91.0	2.49
N1	123.2	90.1	2.37	118.7	91.7	2.38
N2	128.9	93.2	2.36	129.7	92.6	2.42
N3	101.3	89.5	2.32	110.8	89.2	2.37
N4	112.3	91.8	2.44	122.1	91.1	2.41

Remarks: 1: the number of grains per panicle (grains), 2: percentage of grain pithy (%), 3: grain weight of 100 grains (g). N0: without submergence, all N fertilizer was given during planting; N1: with submergence during 7–14 days after planting, N fertilizer was given during planting; N2: with submergence during 7–14 days after planting, 1/2 dose of N fertilizer was given during planting and the rest was given at 42 days after planting; N3: with submergence during 7–14 and 28–35 days after planting, all N fertilizer dose was given during planting; N4: with submergence during 7–14 and 28–35 days after planting, 1/2 dose of N fertilizer was given during planting and the rest was given at 42 days after planting.