硫、硒对紫花苜蓿产量的影响

在盆栽条件下施用硒、硫肥料,研究硒、硫对苜蓿叶绿素含量和干物质的影响,试验采用单施硫肥、单施硒肥和硒硫互作3种方法找出最佳施肥方案,为优质牧草提供科学的施肥方法。结果表明:单施硫肥时,施肥量为S80mg·kg-1时植株含硫量最高,再增加硫肥的施用量,植株硫含量下降。施硫量为S40mg·kg-1时干物质积累最多,但植株中的叶绿素含量随施硫水平变化却不明显。硒用量对植株的干物质影响不明显,而叶绿素随着硒量的增加而增加,硒量为Se3.0mg·kg-1时苜蓿叶绿素含量最高。硒硫元素互作表明,施硫量过多或过少都不利于植株中的硒积累,而S20mg·kg-1+Se1.5mg·kg-1处理植株的硒含量最高,随施硫量的增加植株中硒的积累量变少。施肥处理为S40mg·kg-1+Se1.5mg·kg-1时植株的干物质积累最大,其综合表现也为最佳。

Effect of Sulfur and Selenium on the Yield of Alfalfa

Under the conditions of application of selenium and sulfur fertilizers in potted plants, the effect of selenium and sulfur on the content of chlorophyll and day matter in alfalfa was studied. Test was done with single application of sulfur or selenium fertilizer and interaction of Se and S to find out the best fertilizing program and to provide a scientific method of fertilization to quality forage. The results showed that： When fertilized S was 80 mg·kg^-1,the content of sulfur was the maximum in plant, but increasing the sulfur fertilizer application rate, sulfur content decreased. Sulfur level was 40 mg·kg^-1,the accumulation of dry matter was maximum, the change of chlorophyll content in plants was not significantly with the effect of sulfur levels. Se dosage had no obvious effect on dry matter, but chlorophyll content in plant was increased with increasing selenium, chlorophyll content was the maximum in alfalfa with selenium content of 3.0 mg·kg^-1. The interaction of selenium and sulfur showed that, excess or deficiency of sulfur level were both go against the accumulation of selenium in plants, when fertilizing the plants S 20 mg·kg^-1 ＋ Se 1.5 mg·kg^-1, selenium content was the highest, with the increase of sulfur level, the accumulation of selenium decreased. Fertilization for S 40 mg·kg^-1 ＋ Se 1.5 mg·kg^-1 dry matter accumulation was the maximum, its comprehensive performance was the best.