江南桤木育苗技术的研究

本文研究了江南桤木不同播种量和不同水分管理方法的育苗效果。结果表明，播种量以45kg／hm2量为宜，苗木高生长、地径生长和优质苗产量均优于其他几种处理方法；水分管理以“湿管法”育苗效果最好，苗木的高生长、地径生长和优质苗产量与“水管法”、常规育苗方法间均存在显著差异。     

台湾农产品“希望广场”的考察与启示

为提高我国农产品流通的效率,寻求防止农产品价格大起大落现象的办法,作者于今年五月赴台北农产品＂希望广场＂进行了考察。本文介绍了＂希望广场＂的组建历史、运营模式及绩效、得到的支持及其作用机制等,归纳了对大陆农民组织和农产品流通体系的政策启示。作者认为,农产品直销市场在农产品流通中发挥着显著的作用,对提高消费者福利和增加农民收入有很大帮助,加强农产品直销市场建设刻不容缓。应该将农业市场化建立在农民组织的载体之上,充分发挥农民合作组织在农产品流通中的作用。     

种公牛的饲养管理技术

种公牛是提高牛群质量最关健的因素,一头种公牛自然交配,与配母牛一年大约几百头。利用人工授精技术每年比本交能增加几倍。而用牛冷冻精液结合人工授精技术进行冷配每年配种母牛数量少则上万头,多则几万头。本文从饲养种公牛的基本要求出发,对种公牛的特性,营养与日常饲养管理、防疫和疾病防治,以及安全生产多方面做了整理介绍,以供同行参考。     

基于开源J2EE框架的高校实验教学管理系统研究

依据高等院校实验教学管理的应用需求,在分析开源框架体系结构的基础上,通过整合Struts、Spring和Hibernate,利用分层解耦、框架管理层次的思想构建了一个基于开源J2EE的应用架构,并据此架构开发了高校实验教学管理系统。系统可靠性高,安全性好,可扩展性和可维护性强,能有效提高高校实验教学管理和服务效率。     

Effects of a plastic cover on soil moisture change in a Mediterranean climatic regime

Water deficit is a serious problem for most agricultural crops, especially in arid–semiarid regions, and limits sustainable development. Production can be improved by reducing evapotranspiration and loss of infiltrated water by the use of a plastic cover. We monitored soil moisture fortnightly over 1 yr using a neutron probe near four trees in an olive grove (Olea europaea, var. Arbequina), two of which had a plastic cover buried in the topsoil around them. These trees were monitored using three neutron probe access tubes per tree to compare the behaviour of soil moisture over time with two other identically instrumented and nearby trees with no cover. Analysis was based on the resultant moisture profiles. The plastic cover retained moisture and increased soil water residence time. During the dry season, the amount of water retained in the plots was at most 15–20% greater in the mid‐season and at least 5–6% greater at the end of season than in the central part of the plots near the trunk. The plastic cover was effective to ca. 50 cm with maximum water content near the soil surface. During the wet season, the cover did not affect soil water. Soil moisture was greater near the tree trunk as a result of stemflow and throughfall.     

论农村饮水安全工程的建后管理

从农村饮水安全工程建后管理的重要性出发,分析农村饮水安全工程的类型和特点以及我国目前农村饮水安全工程建后管理中存在的问题,针对问题提出加强农村饮水安全工程建后管理的策略方法.     

热带果蔬生产农资供应链信息管理关键技术研究

分析农资供应链及农资供应链信息管理的研究现状，提出将无线传感网络、电子标签、二维码、数据库等信息技术应用于热带果蔬生产农资供应链信息管理中的思路，并初步设计了信息管理平台，为今后更深入的研究奠定了基础。     

Reflectance-based assessment of spider mite “bio-response” to maize leaves and plant potassium content in different irrigation regimes

It is widely accepted that pest infestations elicit a change in plant physiology, which cause detectable changes in crop leaf reflectance. In this study, we test the hypothesis that crop leaf reflectance may also be used to forecast the risk of pest infestation before they actually occur. We collected reflectance data in 160 spectral bands from 405 to 907 nm from excised leaf pieces from field grown maize plants under 3 irrigation regimes. Leaf material was collected at weekly intervals in two growing seasons. The same leaf pieces were used in choice bioassays with carmine spider mites to assess attractiveness to mites (spider mite “bio-response”) across irrigation regimes. In one growing season, we also obtained nutritional element data (lipid, protein, soluble sugar, starch, lignin, Ca, P, Mg, K, S, and Cl) from whole maize plants. Principal component analysis showed that potassium content (K) was highly negatively correlated with spider mite bio-response. Relative reflectance at 740 nm showed a highly significant and positive trend across spider mite bio-response classes, and that potassium content showed a highly significant and negative trend across the same classes. Thus, we argue that relative reflectance at 740 nm may be used to predict both potassium content and risk of spider mite infestation. Based on extensive reviews, potassium leaf content is known to reduce susceptibility of crops to pests. The results presented provide encouraging support for remotely sensed risk assessment of pest infestations through reflectance-based monitoring of maize leaf attractiveness and highlight that reflectance based monitoring of crop susceptibility may be possible through careful management of macro element crop properties, such as potassium content.     

影响和制约绿色农业产业发展的 关键性问题探讨

党的"十八大"把生态文明建设放在特别重要的战略地位,首次提出了增强生态产品生产能力。为适应这一新要求,为社会提供越来越多安全、生态的绿色农产品,该文立足河北邯郸市绿色农产品生产现状,就下一步绿色农产品生产的发展思路及相应关键性措施作一些初步的研究和探讨。