硫对烤烟干物质积累的影响

Effect of sulfur on dry matter accumulation in flue-cured tobacco

通过液培试验,研究了硫对烤烟干物质积累量和积累速率的影响。结果表明,在一定范围内(0.32~64 mg/L)供硫可以促进烤烟干物质积累量及积累速率的提高,0.32 mg/L处理烤烟的干物质积累量及最大积累速率略低于64 mg/L处理,但明显高于128 mg/L^1024 mg/L处理。在64 mg/L^256 mg/L处理之间随硫浓度升高,烤烟干物质积累量及最大积累速率明显降低。64 mg/L处理烤烟的根、茎、叶及全株进入旺长期的时间明显早于128 mg/L^1024 mg/L处理,且其茎、叶及全株旺长期持续的时间要明显长于128 mg/L^1024 mg/L处理,促进烤烟干物质积累量和积累速率的硫浓度上限阈值为64 mg/L处理。

A cultural solution（0.32-1024 mg/L） experiment was carried out to study effect of sulfur on dry matter accumulation and rate of dry matter accumulation in flue-cured tobacco.Results showed that dry matter accumulation and rate of dry matter accumulation in roots,stalks,leaves and whole plant were increased with the increase of sulfur concentration up to 64 mg/L.Dry matter accumulation and rate of dry matter accumulation of 0.32 mg/L treatment were lower than that of 64 mg/L treatment but significantly higher than treatment from 128 mg/L1024 mg/L.Dry matter accumulation and rate of dry accumulation significantly decreased with sulfur concentration increased from 64 mg/L to 1024 mg/L.During growth there was a period when dry matter accumulation in plants occurred fast.The time of onset of this period of 64 mg/L treatment was earlier than that from 128 mg/L-1024 mg/L.Duration of 64 mg/L treatment were longer than that from 128 mg/L-1024 mg/L.Upper threshold of sulfur concentration in cultural solution was 64 mg/L which promoted flue-cured tobacco dry matter accumulation and rate of dry matter accumulation.