The Scientific World Journal / 2012 / Article / Tab 3

Research Article

Ammonia Volatilization from Urea-Application Influenced Germination and Early Seedling Growth of Dry Direct-Seeded Rice

Table 3

Seed germination percentage, shoot fresh weight, root fresh weight, and root tip number of rice variety Apo grown in three different soils with ammonium sulfate, urea, and urea + NBPT in comparison with zero N input (control) in Petri dish incubation experiment 2. The presoaked seeds were not in contact with soil but exposed to ammonia gas volatilized from soils.

ParameterControlASaUreaaUreaa + NBPTb

Soil I
Seed germination percentage (%)100 a98 a90 a100 a
Shoot FW (g per Petri dish)0.16 a0.17 a0.15 a0.15 a
Root FW (g per Petri dish)0.17 a0.14 b0.01 c0.15 ab
Root tip number per Petri dish22 b32 a2 c23 b

Soil II
Seed germination percentage (%)100 a98 a94 a100 a
Shoot FW (g per Petri dish)0.15 a0.17 a0.15 a0.17 a
Root FW (g per Petri dish)0.14 a0.12 a0.05 b0.15 a
Root tip number per Petri dish27 a26 a5 b23 a

Soil III
Seed germination percentage (%)100 a94 a98 a98 a
Shoot FW (g per Petri dish)0.14 b0.16 b0.19 a0.16 b
Root FW (g per Petri dish)0.12 b0.07 c0.07 c0.15 a
Root tip number per Petri dish24 b7 c5 c27 a

Within a row, means followed by different letters are significantly different at 0.05 probability level according to Least Significant Difference (LSD) test.
aThe rate of ammonium sulfate and urea was 0.15 g N per Petri dish.
bThe rate of NBPT was 1.5 mg per Petri dish.

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