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首页> 外文期刊>International journal of soil science >Nitrogen Stress on Maize Roots in Subtropical Condition of Nepal
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Nitrogen Stress on Maize Roots in Subtropical Condition of Nepal

机译：尼泊尔亚热带条件下玉米根系的氮胁迫

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Background and Objective: Nitrogen (N) is one of the most important elements for plants. Moreover, N is the most dynamic and vulnerable element. Managing N is therefore very crucial in agriculture. Various studies have been carried on the influence of yield and yield attributes of maize at different N levels. Very few studies carried out on rooting architecture. So, this study aims to understand the rooting behavior of maize and to identify efficient cultivars that perform better under N stress condition. Materials and Methods: A pot culture experiment was conducted at Lamjung district of Nepal situated at subtropical condition. Two levels of N (0 and 80 kg ha?1 N) were applied to five varieties (most promising variety) of maize viz., Deuti, Manakamana-3, QPM (Quality protein maize), Arun-2 and Rampur composite in randomized completely block design. Pot media was calculated on mass basis and required nutrients except N was placed at sufficient moisture level. Different root parameters were taken and two-way ANOVA was analyzed by using software MStat-C. The Ms-Excel 2007 was used to make graphs and figures. Results: Results showed that effect of nitrogen was significant for all the root traits except total root length and seminal root length. Interaction between N and variety was significant for root dry matter , number of seminal and crown roots and crown root length. At low N, QPM produced the maximum root dry matter , Deuti with the greatest number of seminal roots, Manakamana-3 with the maximum crown root length and Rampur composite with the highest number of crown roots. Conclusion: Under nitrogen stress condition, the physical parameters of roots perform better than sufficient level of nitrogen. It doesn?t mean the increment in nutrient uptake efficiency in N stress condition. It requires further understanding. Rather, rooting behavior under N stressed condition varies with variety distinctly. The QPM producing the maximum root dry matter at low N and the minimum value at high N and is more tolerant and highly susceptible respectively than other variety. Rooting behavior not only influenced by soil aggregation and physical properties of soil but also with nutrient concentration. Further study is necessary to understand the nutrient uptake behavior in nutrient stress condition.
机译：背景与目的：氮是植物中最重要的元素之一。而且，N是最有活力和最脆弱的元素。因此，管理氮素在农业中至关重要。对于不同氮水平下玉米的产量和产量属性的影响，已经进行了各种研究。关于生根架构的研究很少。因此，本研究旨在了解玉米的生根行为，并确定在氮胁迫条件下表现更好的有效品种。材料与方法：在亚热带条件下的尼泊尔Lamjung地区进行了盆栽试验。将两个水平的氮（0和80 kg ha ？1 N）施用于玉米的五个品种（最有希望的品种），即Deuti，Manakamana-3，QPM（优质蛋白玉米），Arun -2和Rampur复合材料完全随机设计。盆栽培养基是按质量计算的，除氮处于足够的水分含量外，还需要其他养分。取不同的根参数，并使用软件MStat-C分析双向ANOVA。 Ms-Excel 2007用于制作图表。结果：结果表明，氮素的影响对除根总长和精根长以外的所有根系性状均显着。氮与品种之间的相互作用对根系干物质，精根数和冠根数以及冠根长度具有重要意义。在低氮下，QPM产生的根系干物质最大，Deuti的生精根数最多，Manakamana-3的冠根最大长度，而Rampur复合材料的冠根最多。结论：在氮胁迫条件下，根的物理参数表现优于充足的氮水平。这并不意味着氮胁迫条件下养分吸收效率的提高。它需要进一步的理解。相反，在氮胁迫条件下的生根行为随品种的不同而明显不同。 QPM在低氮时产生最大根干物质，而在高氮时产生最小值，分别比其他品种更具耐受性和敏感性。生根行为不仅受土壤团聚和土壤物理性质的影响，还受养分浓度的影响。为了了解养分胁迫条件下的养分吸收行为，有必要做进一步的研究。

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