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氮素形态对甜菜生长发育及营养代谢的影响
Influence of Different Nitrogen Forms on Growth and Nutrition of Sugarbeet
【作者】 王光霞;
【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。
【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.
【Key words】 Sugarbeet; Ammonium nitrogen; Nitrate nitrogen; Mineral nutrition; yield and quality;
- 【网络出版投稿人】 内蒙古农业大学 【网络出版年期】2004年 04期
- 【分类号】S566.3
- 【被引频次】7
- 【下载频次】259