盐碱地马铃薯覆盖栽培增产效果初探

为使马铃薯在滨海盐碱地上开发种植良好生长，选用不同的覆盖物进行覆盖栽培，达到马铃薯的优质高产。     

“空中”种植马铃薯

西班牙在阿拉瓦省进行了西班牙首例大面积无土种植马铃薯的实验。无土栽培技术使每株马铃薯的产量在20个左右，远高于常规种植方法每株3-4个的产量。     

沼液对马铃薯增产机理的试验研究

马铃薯是我省经济价值较高的优势作物，全省常年种植面积700多万亩左右，仅次于小麦、玉米，位居第三位。近年来由于种植面积不断扩大，重茬较多，加之施肥不足，导致马铃薯病害、早衰问题突出，严重限制马铃薯产量的进一步提高。沼肥具有增强作物抗逆性，促进养分吸收，改善品质，提高产量的良好作用。为此，我们选用了不同浓度的沼液施用试验，研究对马铃薯产量及经济性状的影响，筛选出马铃薯产量提高15％实用技术。以克服病害和早衰对马铃薯产量的影响，为大面积推广提高科学依据。     

撒可富马铃薯专用肥与习惯施肥对比试验初报

通过比较撒可富马铃薯专用肥与习惯施肥对马铃薯生长、产量、经济性的影响，筛选经济合理的施肥种类与方法，为马铃薯种植施肥提供科学依据。     

不同微集雨模式对马铃薯生长和产量的影响

以马铃薯“新大平”品种为试材，于2009年在甘肃省定西市旱作农业推广中心进行大田试验。微集雨技术共含3个不同处理方式，包括A：平地种植，B：垄沟半膜覆盖种植，C：垄沟全膜覆盖种植。分别测定了各处理组的出苗率、生育期、叶面积指数和产量4个相关指标。结果表明，垄沟全膜和半膜覆盖种植组的出苗率、叶面积指数、产量都显著高于平地种植。本试验为提高西北半干旱雨养农业区地区马铃薯产量以及适宜的栽种模式提出了相关的模型和理论依据。     

拱棚马铃薯优质高效生产技术

在固原市马铃薯主产区有补灌条件的田块进行了拱棚马铃薯种植试验与示范研究。结果表明：拱棚种植马铃薯不但提前出苗期,而且促使马铃薯苗壮、苗全,生长发育良好,有效地改善了马铃薯的农艺性状。其产量较常规种植增产65．03％,增产效果明显。     

宁南山区拱棚马铃薯优质高效生产技术研究

在固原市农科所头营科研基地有补灌条件的田块进行了拱棚马铃薯种植试验与示范研究。结果表明:拱棚种植马铃薯不但提前出苗期,而且促使马铃薯苗壮、全,生长发育良好,有效地改善了马铃薯的农艺性状。其产量较常规种植增产65.03%,增产效果明显。     

卓资县马铃薯种植的气候条件分析

马铃薯的种植具有经济价值高、植株适应能力强且产量较高的特点,同时具有较高的营养价值。在马铃薯的生长过程中,水分使其产量形成的基础,灌溉是确保马铃薯可以稳产高产的重要条件,该文主要结合卓资县当地的气候条件,根据1981—2018年该县的气候变化特征,分析并得出此地适宜马铃薯的种植,同时也做出了一些马铃薯高产稳产的思考,以期为卓资县马铃薯的大量种植提供参考。     

马铃薯不同抗旱品种引进筛选试验研究

马铃薯是庄浪县区域特色产业之一,但我县旱作马铃薯种植区干旱少雨,导致露地马铃薯产量低而不稳,种植效益低下.因此为了筛选出适合旱作区种植的马铃薯抗旱新品种,以及不同用途、不同生育期时期的品种,在庄浪县通化乡全膜微垄穴播条件下,设此试验.试验结果表明:15-2-21小区平均产量235.6 kg,折合产量2856.0 kg·...     

“西芋 ３ 号”高产栽培密度和施肥量研究

[目的]研究适宜于川西南高海拔山区马铃薯肥料施用及种植密度的优化种植技术模式? [方法]采用二次正交旋转 组合设计?研究 Ｎ、Ｐ、Ｋ 肥及种植密度对“西芋 ３ 号”产量、主茎数及净光合速率的影响? [结果]各试验因子对净光合速率影 响的重要程度为:氮肥>磷肥>种植密度>钾肥?对主茎数的影响重要程度为:氮肥>种植密度>磷肥>钾肥?对产量影响的重要 程度为:钾肥>氮肥>磷肥>种植密度? 产量大于 ２ ０００ ｋｇ / ６６７ ｍ２ 、净光合速率大于 １６ μｍｏｌ / (ｍ２??ｓ)及主茎数在 ３~ ６ 个/ 穴的 试验方案共计 ３９ 套? [结论]高产栽培应合理控密控氮?施足磷肥?增施钾肥? 马铃薯“西芋 ３ 号”最适农艺措施为:种植密度 ４ ３１７~ ４ ５２９ 株/ ６６７ ｍ２ 、Ｎ 施用量 ６.３９ ~ ７.５２ ｋｇ / ６６７ ｍ２ 、Ｐ２ Ｏ５ 施用量 ５.００ ~ ５.８３ ｋｇ / ６６７ ｍ２ 、Ｋ２ Ｏ 施用量 ２４.９４ ~ ２８.６６ ｋｇ / ６６７ ｍ２ ?     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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