Technical Standards for Lotus Root-Redswamp Crayfish Integrated Farming

Lotus root-redswamp crayfish integrated farming is a kind of ecologicalgrow mode on the basis of paddy field, which is an innovated mode for agricultural structure adjustment and special agriculture with high efficiency. In order to regulate producing technology of this mode, the essay puts forward some technical require- ments, stressing on cultivar selection, field works, farming technology and product quality, which aims at providing technical support for agricultural production.

Research Progress of Rice-Fish Integrated Farming

Rice-fish integrated farming （RFIF） can change the agricultural production pattern from mono-farming model to the co-farming model, and the stereoscopic and integrated farming system established by RFIF can change the flat production to the stereoscopic production. Therefore, RFIF is the important development direction for agriculture to change pattern and adjust structure. In order to further promote development of the research and application of RFIF, the general development situation of RFIF in China was reviewed; the effects of RFIF on increasing farmer income and enhancing agricultural efficiency were clarified. The technologies matched with RFIF, such as rice paddy engineering technology, safe plant protection technology, security fertilization technology, fish disease prevention and control technology and water quality management technology, were summarized, and the supporting role of RFIF for agriculture was pointed out. In addition, the development prospect of RFIF was proposed, as well as the key research direction of RFIF.

Development of an Integrated Tool for Small-Scale Maize Farming in Uganda

About 62% of the maize produced in developing countries is cultivated manually owing to limited access to appropriate technology. Available technologies perform a single operation, necessitating farmers to buy multiple implements, which is expensive. In this study, an ox-drawn tool integrating a plough, planter and cultivator for small-scale maize farming was developed and its performance evaluated. Planting and cultivating units were designed and fabricated for assembly onto an existing standard ox-plough beam. The integrated tool was tested in the field to assess the effectiveness and efficiency of cultivation and planting of maize. Results showed that the planting unit had an average seed rate of 35.4 kg/ha with a seed damage of 4% and an effective field capacity of 0.15 ha/h at a field efficiency of 87.3%. The cultivating unit had an effective field capacity of 0.1 ha/h and a weeding efficiency of 86%. The efficiency, effectiveness and reliability for field operations are superior to manual operations currently used by farmers and are comparable to single-unit prototypes developed in other countries. This demonstrates the technical feasibility of integrating planting and cultivation units onto an existing mould board plough instead of buying multiple tools.

Transient Stability Study of Power System with Large-Scale Wind Farm Integration

Large-scale wind power integration has become the current development trend of the power system. Large-scale wind power integration can change the original structure and characteristics of the system. Thus, it’s necessary to analyse the transient stability of power system which contains wind power, and to study the controlling strategy for improving the transient stability of power system. Based on EEAC, this paper studies the transient stability of the power system which contains wind power system theoretically, proposes the calculation method for accelerating area, decelerating area and margin, and illustrates the impact of wind power integration on the transient stability with power angle curve. Furthermore, this paper studies the modeling and simulation, and the experimental results prove the correctness of the theories.

Empirical Study on the Benefit Increase of New Contract Farming 1+3+X Model

For a long time,the development model of traditional rice planting industry has been single,linear,and focusing on production first and then market.However,with the low price of rice,such problems as slow technological upgrading,meager profits,and unstable rice quality in the primary industry planting units and farmers have become increasingly prominent.The integration and development of the rural primary,secondary,and tertiary industries and industrial integration have the same root.They are integrated industrial development based on technological or model innovation,vertical and horizontal integration.Three agricultural leading companies(Nanjing Tianwei Agricultural Technology Co.,Ltd.,Nanjing CHYKINGYOUNG Biological Technology Co.,Ltd.,and Jiangsu Jingshan Eco-organic Agriculture Co.,Ltd.)established an industrialization complex,and used their respective technical,operational,and market advantages to integrate and form a rice contract farming 1+3+X model.This model effectively integrates scattered rice planting,rice processing,and rice sales in Nanjing City of Jiangsu Province,and Chuzhou City of Anhui Province,and unifies planting regulations and supply of production materials,safeguards the supply of green and high-quality rice and realizes high quality and high price.In addition,it integrates farmers into the entire industrial chain of contract farming,summons up the production enthusiasm of farmers and greatly increases their income from planting production.

重庆市县域乡村三产融合与农户福祉的耦合协调关系研究——基于宜居宜业和美乡村视角

建设宜居宜业和美乡村是推进乡村全面振兴的阶段性任务。基于宜居宜业和美乡村视角,构建乡村三产融合与农户福祉的评价体系。通过分析二者的空间格局以及耦合协调关系,探讨了重庆市县域乡村的发展路径。研究结果表明:①重庆市县域乡村三产融合发展过程中受到农户福祉协同增进的作用,二者的耦合协调性较好,以适度协调和初级协调为主,整体上呈现出从过渡发展阶段向协调发展阶段转变的趋势。②分维度看,乡村三产融合行为的农业产业链延伸、乡村业态多元化与农业多功能性3个维度与农户福祉各维度间的耦合协调关系以农户福祉为刚性主导,而乡村三产融合成效的经济与社会效益两个维度与农户福祉各维度间的耦合协调关系以乡村三产融合为刚性主导;两者的高值区与低值区分布相对一致,高值区主要集中在渝西地区,低值区主要集中在渝东北片区偏东北边缘区域和渝东南片区偏东南边缘区域,二者之间呈现出显著的空间协同。③基于乡村三产融合与农户福祉的耦合协调关系,重庆市县域乡村可划分为3种耦合类型:乡村三产滞后型、同步型与农户福祉滞后型。据此,提出了建设宜业乡村、助推产业发展,宜居宜业乡村协同推进,建设宜居乡村、保障农户福祉3种路径,旨在促进乡村三产融合与农户福祉协调发展,让农民能够通过在农村从事农业及相关生产活动,享受到更加幸福的生活。

Study on Diversity of Arthropod Community in a Rice-duck Integrated Farming System in South China

The integration of ducks into rice farming has raised concerns about possible effects on arthropod communities due to frequent predation by ducks. This paper conducted a study using three treatments, including integrated rice-duck cultivation （RD）, conventional rice cultivation （CC） and a control treatment （CK）, to investigate the impact of rice-duck farming on the diversity of arthropod communities in the field. The results revealed that arthropod numbers in both RD and CC treatments showed varying degrees of reduction when compared with the CK treatment. Arthropod individual numbers, Simpson （D） and Shannon＇s diversity index （H＇） values in RD were higher than those in CC. Arthropod individual numbers, richness index （R）, D and H＇ values in both tillering and booting phases of the late rice were significantly higher in RD treatment than those in CC treatment. Rice-duck integration system was favorable for the maintenance of arthropod diversity in the cropping field and may help to lessen the decline in abundance and diversity of rice farmland arthropods caused by the utilization of chemical pesticides and fertilizers.

农耕文化与农类高校党建融合发展的创新路径研究

文化的土壤与党建的根脉是新时代鲜明的特色,农耕文化与农类高校党建融合发展的创新路径,旨在通过挖掘农耕文化深厚底蕴,实现跨界融合激发教育新活力,促进文化传承与党建创新的双重飞跃。该文分析农耕文化在农类高校呈现的内容和形式,聚焦于党建与农耕文化融合发展的时代价值和现实困境,提出农耕文化与高校党建融合发展的创新路径,不仅能够丰富党建内容,增强党组织的凝聚力和战斗力,还能有效引导学生树立正确的价值观,培养知农爱农的新型农业人才。农耕文化与农类高校党建的深度融合,不仅是文化传承的需要,更是推动农业高等教育高质量发展的内在动力,值得深入研究和广泛实践。

Impact of Wind Farms of DFIG Type on Power System Transient Stability

The impact of large-scale grid-connected wind farms of Doubly-fed Induction Generator (DFIG) type on power system transient stability is elaborately discussed in this paper. In accordance with an equivalent generator/converter model, the comprehensive numerical simulations with multiple wind farms of DFIG type involved are carried out to reveal the impact of wind farm on dynamic behavior of existing interconnected power system. Different load models involving nonlinear load model and induction motor model are considered during simulations. Finally, some preliminary conclusions are summarized and discussed.

Special report on relationship between wind farms and power grids

The installed capacity of a large scale wind power plant will be up to a number of hundreds MW, and the wind power is transmitted to load centers through long distance transmission lines with 220 kV, 500 kV, or 750 kV. Therefore, it is necessary not only considering the power transmission line between a wind power plant and the first connection node of the power network, but also the power network among the group of those wind power plants in a wind power base, the integration network from the base to the existed grids, as well as the distribution and consumption of the wind power generation by loads. Meanwhile, the impact of wind power stochastic fluctuation on power systems must be studied. In recent years, wind power prediction technology has been studied by the utilities and wind power plants. As a matter of fact, some European countries have used this prediction technology as a tool in national power dispatch centers and wind power companies.

Bigger Harvests from Human-Technology Integration

The integration of agricultural machinery,agronomy,and information technology is fostering smart farming across the country,and provides strong technical support for higher grain yields.MAY 22 every year has been designated by Qingdao Sea Rice Research and Development Center as Sea Rice Transplanting Festival as an expression of its great respect to Yuan Longping,the father of hybrid rice.Sea rice,a rice variety of high saline-alkaline tolerance,has opened up enormous horizons for China’s grain production.Its success has turned vast land space of barren beaches into fertile fields.

风电场参与电网调频的多机协同控制策略

【目的】考虑风电场中不同风况下风电机组参与一次调频能力的差异,在下垂控制和惯量控制策略的基础上,对机组的调频能力评估方法进行优化。【方法】提出了一种改进的多机组调频参考功率协同控制策略。【结果】引入多机组协同控制方法能够有效改善机组之间调频参考功率的分配,从而有效调节各机组参与系统一次调频的程度。在惯量控制和下垂控制的基础上引入改进的协同控制策略,依据机组在实际风况下运行的状态,评估机组能够有效参与一次调频的参考功率。引入调频能力系数能够实现调频功率参考值在各机组之间按能分配。【结论】协同控制策略能够有效保护风电机组转速,同时能够有效改善电网频率响应。

乡村振兴背景下栽培与耕作学教学改革与探索

栽培与耕作学是涉农专业的核心课程之一,在乡村振兴背景下,其对农业人才的培养具有重要作用。该文以贵州师范学院为例,对栽培与耕作学课程的历史沿革进行介绍,对课程教学现状以及存在的问题进行探讨分析,从课程思政、课程内容、教学评价和教学方法等方面提出一些建议,以期为高质量课程的建设提供参考。

面向乡村振兴的农业技术应用与推广型人才培养体系构建与实践--以山东农业大学为例

全面推进乡村振兴,实现农业农村现代化,关键在科技、在人才。山东农业大学构建的农业技术应用与推广型人才培养体系,在人才培养实践中坚持“学生中心、需求导向、协同育人”培养理念,采用厚植情怀、耕读合一和协同育人等人才培养路径,创建“四课融通、‘四层次’实践、三位导师、三联合”育人模式。经过五年实践,培养一批“下得去、用得上、留得住、干得好”的农业技术应用与推广型人才,在破解乡村振兴人才瓶颈问题方面呈现出良好的发展局面。

稻虾共作稻田浮游植物群落格局及环境影响因子

为了解稻虾共作稻田浮游植物群落结构特征,对安徽省肥西县和全椒县国家级稻渔综合种养区稻田浮游植物进行了养殖前期、中期、后期三次调查,并探讨了其与环境因子的关系。结果表明,肥西、全椒分别观察到浮游植物6门55种、7门61种,两地的优势类群均为绿藻门和硅藻门。肥西、全椒浮游植物平均密度分别为3.50×10^(6)ind./L和7.90×10^(6)ind./L,平均生物量分别为1.49 mg/L和2.55 mg/L。对Margalef丰富度指数(D)、Shannon-Wiener多样性指数(H′)和Pielou均匀度指数(J)的分析表明:肥西三个养殖时期的D无显著差异,而H′和J均有显著差异;全椒三个养殖时期的H′、D和J均无显著差异。典型对应分析(CCA)表明:溶氧、pH、水温、叶绿素a是与肥西浮游植物群落结构相关性较强的环境因子;冗余分析(RDA)表明:总磷、高锰酸盐指数、pH、氨氮是与全椒浮游植物群落结构相关性较强的环境因子。浮游植物密度结果表明,两地稻田前期和中期水质为中营养状态,后期为富营养状态。

关于农耕文化赋能乡村产业融合发展的几点思考

农耕文化泛指与农耕生产相关的综合性的知识形态和文化表征,其最直接的表现形式是重要农业文化遗产和乡村非物质文化遗产,因其显著的地域性、意义和价值的多层面性以及低成本的可叠加性等特征而具有强大的使能性,是赋能乡村产业融合发展的重要资源和有力杠杆。乡村产业融合发展面临同质化竞争等严峻挑战,亟需发挥农耕文化的赋能作用。农耕文化赋能乡村产业融合发展的行动策略可以概括为三大步骤,即“普查”“链接”和“激活”。通过对农耕文化的“普查”并将其与现代生活和乡村产业发展相“链接”,有助于“激活”农耕文化和农业农村资源的巨大潜能,让历史悠久的农耕文化在新时代展现其魅力和风采,进而赋能乡村农工文旅产业融合创新,整体推动农业农村新质生产力发展。

耕读文化与环境土壤学课程实践教育融合探析

新时代高校开展耕读教育是推进乡村振兴的文化自觉,也是深化实践教育的内涵延伸。该文通过3年环境土壤学实践教育与耕读文化的融合,结合地域特色、建设实践基地,阐述在融合过程中,如何通过耕读文化培养学生学农、爱农、弘农的责任感与使命感。以期激发学生主动学习的热情和兴趣,将理论扎根于实践,使耕读文化贯穿教学环节,实现专业课与耕读文化的有机统一。

家庭农场创业资源整合驱动因素与作用机理研究——基于扎根理论和SEM模型的融合方法

我国现有家庭农场尚处于起步阶段,因受自身弱质性、创业资源匮乏、创业环境复杂性等因素制约而面临着巨大挑战。文章基于相关文献将家庭农场创业资源整合过程界定为识别、获取、配置和运用,使用扎根理论方法分析30个家庭农场资源整合案例,形成创业资源、内在需求、整合意愿、农场主个性特征、创业环境和家庭农场创业资源整合6个维度理论构想,建立驱动因素模型。依据分析结果,借鉴相关测量量表开发创业资源整合驱动因素量表,验证量表信效度并利用结构方程模型对建构的理论模型进行实证检验。结果表明,创业资源和整合意愿直接驱动家庭农场进行创业资源整合,内在需求经由整合意愿驱动家庭农场进行创业资源整合,农场主个性特征和创业环境在内在需求与整合意愿关系中起调节作用。通过拓宽创业资源整合的研究外延,丰富家庭农场创业问题的理论与方法体系,为家庭农场破解资源约束困境提供了新思路。

基于改进的随机森林—模糊积分模型的家庭农牧场信用评级研究

缓解融资难融资贵问题是实现家庭农牧场可持续发展的关键,而构建家庭农牧场信用评级体系是解决该难题的基础。针对家庭农牧场信用风险评估中样本数据指标多、噪声复杂、非线性乃至高维度等问题,以内蒙古自治区12个盟市500个家庭农牧场为信用评价对象,将XGBoost算法、随机森林算法、模糊积分模型进行组合,构建了改进的随机森林—模糊积分模型,对家庭农牧场进行信用评级。分析结果表明:运用改进的随机森林—模糊积分模型对家庭农牧场进行信用评级的准确率、精确率、召回率、F1分数更高。

山区农产品主产区种养关联碳减排潜力估算——以四川洪雅、开江、盐亭和兴文县为例

种养关联既可有效利用农业废弃物,又具碳减排效应。已有研究主要聚焦农业废弃物资源化利用及其污染控制,对农业种养关联碳减排缺乏关注。本文以四川盆地山地丘陵农产品主产区的洪雅、开江、盐亭和兴文4县为研究对象,采用草谷比法估算作物秸秆量,依据能量转化构建秸秆饲料化利用碳减排潜力估算法,采用排泄系数法估算畜禽粪便量,依据营养物质循环构建粪便肥料化利用碳减排潜力估算法,探讨2008—2017年该区种养关联碳减排潜力。结果表明:(1)该区种养关联年均碳减排潜力为19.42×10^(4)t,且微弱上升(1.25%)。其中,作物秸秆饲料化利用年均碳减排潜力15.49×10^(4)t,上升8.37%;畜禽粪便肥料化利用年均碳减排潜力3.93×10^(4)t,下降23.09%。(2)该区单位耕地面积种养关联碳减排潜力为2.04 t/hm^(2),其中,开江(2.36 t/hm^(2))>洪雅(2.30 t/hm^(2))>盐亭(2.01 t/hm^(2))>兴文(1.57 t/hm^(2))。(3)该区种养关联碳减排潜力中作物秸秆饲料化利用占比(79.75%)>畜禽粪便肥料化利用(20.25%);作物秸秆饲料化利用碳减排潜力以水稻(35.07%)、玉米(24.99%)、小麦(13.44%)和油菜(12.77%)等作物为主(共86.27%);畜禽粪便肥料化利用碳减排潜力以牛粪便为主(占52.94%)。本研究可以为山地丘陵区种养关联碳减排提供理论依据。