【作者】 王光霞；

【导师】 樊明寿； 邵金旺； 张少英；

【作者基本信息】 内蒙古农业大学 ， 植物学， 2004， 硕士

【摘要】 本实验以甜菜农华9808品种为试验材料，研究了在石灰性土壤条件下，不同形态氮素对其生长发育和矿质营养代谢的影响，结果表明：（1）叶丛NR活力并不随NO3-的浓度增加而增加，而是以NO3-/NH4+比例为70/30处理最高，不同NO3- / NH4+ 比例改变块根NR活性变化趋势。（2）两种氮素共存时，NH4+—N比例的增加有利于植株对N、P，Fe、Zn的吸收与利用,无论何种形态及配合比例的N素处理均提高了全株K+、Na+的吸收量。（3）NH4+—N有利于叶丛多种游离氨基酸积累，而块根游离氨基酸含量以NO3- / NH4+为70/30时最高。（4）氮素形态对甜菜各个时期蔗糖转化酶活性，还原糖及蔗糖含量影响显著，一定比例NH4+—N的存在有利于提高甜菜的产、质量。含糖率以NO3-/NH4+为30/70时最高，块根产量以NO3-/NH4+为50/50时最高，产糖率最高的处理是NO3-/NH4+为50/50。上述结果为改善甜菜施肥，提高其产、质量提供了一定理论基础。更多还原

【Abstract】 NongHua 9808 were used to study the influence of NO3- -N and NH4+-N on plant growth and mineral nutrition. The results showed that:(1) The activity of nitrate reductase(NR) didn’t increase along with increase of NO3- -N, and there was the highest activity of NR in leaves when NO3-/NH4+ was 70:30; The different ratio of NO3-/NH4+ changed the trend of activity of NR in roots.（2）Different nitrogen forms coexisted, the increase of NH4+-N had enhanced the absorption and utilization of N,P, Fe & Zn, Existence of nitrogen improved the contents of K+、Na+.（3）NH4+-N promoted the cumulation of amino acid in leaves; but amino acid in roots was the highest when NO3- / NH4+-N ratio was 70:30. (4) N forms influenced the activity of invertase enzyme , the contents of reductive sugar and sucrose. Suitable ratio of NH4+-N improved the yield and quality of sugarbeet. When NO3- / NH4+-N ratio .was 30/70,50/50 and 50/50 respectively, the sugar content, beet yield and sugar yield were the highest respective. The result could be theoretical fundament for optimizing fertilization and improving of yield and quality of beet sugar.更多还原