摘要
探讨了沙质土壤条件下不同氮肥施用水平对油莎豆干物质及养分累积、分配和产量的影响,为沙质土壤条件下油莎豆合理施用氮肥提供理论依据.以油莎豆品种"中油莎 1 号"为试验材料,采用大田试验,设不施氮(N0)、低氮(N1)、中氮(N2)、高氮(N3)4 个施氮水平,分析不同氮肥施用水平对油莎豆干物质及养分累积、分配和产量的影响.结果表明,随生育期的推进油莎豆茎叶、根、块茎干物质累积量的变化趋势均呈上升趋势.在块茎形成期前油莎豆主要以地上部茎叶营养生长为主,块茎形成期后生长中心逐渐向地下部块茎转移,至收获期块茎干物质累积分配比例高达 43.34%～51.00%.2 年 N2 水平块茎干物质累积量及分配比例均高于其他水平,较其他施氮水平平均提高17.50%和 4.00%.油莎豆对氮、钾需求量较大,磷较少.收获期油莎豆氮、磷、钾累积量表现为块茎>茎叶>根,块茎成为油莎豆氮磷钾最终的贮藏器官.N2 水平下油莎豆氮、磷、钾累积吸收量在整个生育期内一直呈较高水平,特别是块茎在收获期的氮、磷、钾分配比例分别达到 47.09%、65.82%和 56.40%.N2 水平下,油莎豆地上部生物量、地下部生物量、千粒重、块茎产量均高于其他水平,较其他施氮水平平均提高 5.57%、7.40%、15.83%和 18.12%.在沙质土壤栽培条件下,油莎豆氮施肥量以 150 kg hm-2 较为适宜.
Abstract
The effects of different nitrogen fertilizer application levels on dry matter and nutrient accumulation,distribution and yield of Cyperus esculentus under sandy soil conditions were evaluated,which provided a theoretical basis for the rational appli-cation of nitrogen fertilizer in Cyperus esculentus under sandy soil conditions.A field experiment was conducted with four nitro-gen application levels:no nitrogen(N0),low nitrogen(N1),medium nitrogen(N2),and high nitrogen(N3).The effects of differ-ent nitrogen fertilizer application levels on dry matter and nutrient accumulation,distribution and yield of Cyperus esculentus'Zhongyousha 1'were explored.The results showed that the dry matter accumulation in stems,leaves,roots,and tubers of Cype-rus esculentus showed an increasing with the development of growth.Before the tuber formation period,Cyperus esculentus was mainly based on the vegetative growth of the above-ground stems and leaves.After the tuber formation period,the growth centre gradually shifted to the underground tubers,and the proportion of dry matter accumulation and distribution in the tubers was as high as 43.34%-51.00%at harvest stage.The dry matter accumulation and distribution ratio of tubers at N2 level in two years were higher than those at other levels,which were 17.50%and 4.00%higher than those at other nitrogen levels,respectively.Cyperus esculentus had a large demand for nitrogen and potassium,and less phosphorus.The accumulation of nitrogen,phosphorus,and potassium in Cyperus esculentus was the order:tuber>stem and leaf>root,and tuber became the final storage organ of nitrogen,phosphorus,and potassium in Cyperus esculentus.The cumulative absorption of nitrogen,phosphorus,and potassium in Cyperus esculentus under N2 level had been at a high-level during growth period,especially the distribution ratio of nitrogen,phosphorus and potassium in tubers at maturity stage reached 47.09%,65.82%,and 56.40%,respectively.Under the N2 level,compared with other nitrogen application levels,the above-ground biomass,under-ground biomass,1000-grain weight,and tuber yield of Cyperus esculentus were higher than other levels,and increased by 5.57%,7.40%,15.83%,and 18.12%on average,respectively.Therefore,under the cultivation condi-tions of low sandy soil fertility level,150 kg hm-2 nitrogen fertilizer was more suitable for Cyperus esculentus.
维普
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