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

Figure 2

Fertilizing treatment effect for two rice varieties on grain yield (a) and relative grain yield (b) at condition of dirty water submergence stress. N0: without submergence, all N fertilizer was given during planting; N1: for submergence during 7–14 days after planting, N fertilizer was given during planting; N2: for 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: for submergence during 7–14 and 28–35 days after planting, all N fertilizer dose was given during planting; N4: for 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. Numbers followed by the same characters are not significantly different at least significant difference or LSD_0.05: 28.7.

(a)

(b)