Results 21 to 30 of about 638 (151)

Synergistic Effects of No-tillage Combined with Mulching on Improving Soil Moisture Use and Potato Yield [PDF]

open access: yes
[Objective] Considering the severity of both spring drought and spring cold, and shallow effective topsoil in the southern mountainous areas of Ningxia Province, synergistic effects of no tillage combined with mulching on improving soil moisture use and ...
DUAN Ruibing   +5 more
core   +1 more source

Mejores prácticas de manejo para el uso optimizado del suelo y el agua en la agricultura [PDF]

open access: yes, 2021
Chinese translation: Yun Xie, Lixin Chen, Jie Tang, Zhaoqi Fu, Meng Zhang, Hanlin Dong.English version available at http://dx.doi.org/10.20350/digitalCSIC/13964Spanish version available at http://dx.doi.org/10.20350/digitalCSIC/13985在Shui项目框架下 ...
Chen, L.   +9 more
core   +1 more source

四川冬水田的历史变迁 [PDF]

open access: yes, 2014
四川冬水田的发展史大致可分为清代的兴起与扩展,民国的继承与发展,新中国的改造与缩减三大阶段。水稻种植规模的大小、劳动生产率的高低、水利设施的多少均是影响冬水田发展的因素之一。以往提高农业产出的是改造冬水田的动因;现今提倡恢复冬水田又是出于其水利、生态湿地价值的考虑。冬水田作为一项大规模的水利工程,其之于四川农业 ...
陈桂权
core  

Study on Exemption of Commercial Tax in Song Dynasty [PDF]

open access: yes, 2016
随着宋代商税征收制度的逐渐完善,商税蠲免也日益成为统治者所关注的问题。商税蠲免和商税征收制度是互为表里关系,商税蠲免实质上是对商税征收制度的一种补充。政府对商税进行蠲免,并不是完全为了促进商业发展,而是将其作为调节社会矛盾的手段,体现了政府对商业利用的心态。因此,研究商税蠲免问题不仅可以丰富商税征收制度研究,还可以从不同角度探讨统治阶级对国家治理问题。本文主要分为四个部分: 第一部分为第一章,宋代商税概念及商税则例的变化。主要明确宋代商税的概念和商税则例 ...
陈妍
core  

Environmental and economic assessment of the intensive wheat - maize production system in the North China Plain [PDF]

open access: yes, 2016
To ensure food security for its vast population input intensification in crop production has been one of Chinas major strategies in the last decades.
Ha, Nan
core  

Pilot Exploration of Global Advanced Digital Agricultural Technologies in China’s Grain Production [PDF]

open access: yes
In response to the two major strategic needs of increasing national grain yield per unit area and 3rd-party professional services, this paper systematically expounds on the challenges such as climate change faced by global food production and the ...
LI Xun, PAN Chao
core   +1 more source

Simulation on Soil Carbon, Nitrogen Cycles and Output Characteristics at Banana Fields, Southeast China [PDF]

open access: yes, 2011
土壤C、N循环是农业生态系统最基本的生态过程,了解土壤C、N循环是研究陆地生态系统C、N循环的重要前提。本文以南靖县五川流域的一个小流域为研究区域,选取施肥量高、面积大的种植香蕉土地利用类型为例,采取模型模拟的方法,应用NCSWAP模型模拟了较长时间尺度下(1998~2007年)土壤C、N各种循环过程及输出特征,对可能影响C、N循环的管理措施因素进行情景模拟分析,最后对农业生产和管理环节提出建设性的措施,取得了如下研究成果: (1)对种植香蕉土壤的NO3--N和SOC含量季节性变化进行了验证 ...
黄虹
core  

Research Progress of Nitrogen Leaching in Farmland Soil [PDF]

open access: yes, 2014
对农田土壤氮素淋失的相关研究进行综述和总结是研究农业面源氮素污染的一个至关重要的前提。本文从土壤氮素渗漏淋失形态和迁移机理、氮素渗漏淋失的研究方法和影响土壤氮素渗漏淋失的因素三方面进行了详细的分析介绍,概述了近年来国内外农田氮素渗漏淋失的研究进展和研究成果,并在此基础上展望了未来氮素淋失研究工作的重点。研究结论对农田土壤的水肥管理措施及浅层地下水硝氮污染的减缓有一定的理论和借鉴意义Reviewing and summarizing the related research of farmland ...
朱木兰, 李青松, 王吉苹
core  

冷凉区旱地玉米保护性耕作土壤环境及产量效应研究

open access: yesShuitu Baochi Xuebao, 2018
针对冷凉区旱地玉米生产中存在的干旱缺水、低温冷凉、土壤肥力下降等问题,于2011—2016年采用裂区设计,在山西省旱作节水农业—阳曲县河村示范基地,设置了6种不同耕作覆盖处理,研究旱地玉米保护性耕作的土壤环境及产量效应。结果表明:(1)免耕+二元覆盖、条耕+二元覆盖分别较常规旋耕+地膜覆盖平均增加0—200 cm土壤贮水量20.8,32.1 mm;免耕+秸秆半覆盖、条耕+秸秆半覆盖分别较常规旋耕+露地种植平均增加0—200 cm土壤贮水量24.3,16.3 mm。(2 ...
张冬梅   +8 more
doaj  

Breeding report of a new Canarium album cultivar Qingyin Ganlan [PDF]

open access: yes
Qingyin is an middle-late-season and table Chinese olive selected from a seeding of Tianzhong olive. It was initially selected in 2012 for its good taste with light astringency and full aroma. Through propagation by grafting, the fruit of grafted progeny
CHEN Gaixun   +10 more
core   +1 more source

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