特大型沼气工程温室气体减排效益分析——以“海南澄迈日产3万Nm3车用沼气项目”为例     

张晓琳  罗浩夫  郑启恩  闫亮 《热带作物学报》2014,(5):31-34

根据国际通用的温室气体减排计算方法，对海南澄迈日产3万Nm3车用沼气工程所带来的主要温室气体减排量和减排效益进行了估算分析。结果表明：项目每年可减少温室气体排放53 560 t(CO2当量)，以上海碳交易市场近年平均交易价格(39.23元/t CO2)计算，可带来210.12万元的经济效益。  相似文献   

三个小麦品种引种栽培及其抗性淀粉含量比较     

李苗  马斯霜  白海波  朱金霞  张源沛  郑国保 《黑龙江农业科学》2020,(1):55-58

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板栗树嫁接后九字管理技术     

武红霞  郑丽锦 《河北林业科技》2020,(4):46-48

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覆盖对红叶石楠和红豆杉生长的影响     

张金莎  王平  陈永安  舒东膂  胡勇 《湖南林业科技》2014,(5):63-64

在相同地域条件下,采用传统养护方式与覆盖养护方式的对比试验,研究覆盖对红叶石楠和红豆杉生长的影响。结果表明:合理有效的覆盖养护方式,可以明显的改良土壤肥力,促进植株生长。  相似文献   

Regional distribution of wheat yield and chemical fertilizer requirements in China          下载免费PDF全文

XU Xin-peng  HE Ping  CHUAN Li-min  LIU Xiao-yan  LIU Ying-xia  ZHANG Jia-jia  HUANG Xiao-meng  QIU Shao-jun  ZHAO Shi-cheng  ZHOU Wei 《农业科学学报》2021,20(10):2772-2780

Quantification of currently attainable yield and fertilizer requirements can provide detailed information for assessing the food supply capacity and offer data support for agricultural decision-making. Datasets from a total of 5 408 field experiments were collected from 2000 to 2015 across the major wheat production regions in China to analyze the spatial distribution of wheat yield, the soil nutrient supply capacity(represented by relative yield, defined as the ratio of the yield under the omission of one of nitrogen(N), phosphorus(P) and potassium(K) to the yield under the full NPK fertilizer application), and N, P and K fertilizer requirements by combining the kriging interpolation method with the Nutrient Expert Decision Support System for Wheat. The results indicated that the average attainable yield was 6.4 t ha~(-1), with a coefficient of variation(CV) of 24.9% across all sites. The yields in North-central China(NCC) and the northern part of the Middle and Lower reaches of the Yangtze River(MLYR) were generally higher than 7 t ha~(-1), whereas the yields in Southwest China(SWC), Northeast China(NEC), and the eastern part of Northwest China(NWC) were usually less than 6 t ha~(-1). The precentage of area having a relative yield above 0.70, 0.85, and 0.85 for N, P, and K fertilizers accounted for 52.3, 74.7, and 95.9%, respectively. Variation existed in N, P, and K fertilizer requirements, with a CV of 24.8, 23.9, and 29.9%, respectively, across all sites. More fertilizer was needed in NCC and the northern part of the MLYR than in other regions. The average fertilizer requirement was 162, 72, and 57 kg ha~(-1) for N, P_2O_5, and K_2O fertilizers, respectively, across all sites. The incorporation of the spatial variation of attainable yield and fertilizer requirements into wheat production practices would benefit sustainable wheat production and environmental safety.  相似文献   

农机装备综合实验平台管理系统应用          下载免费PDF全文

郑惠枚  于晓波  谭增鑫  王恒一  靳晓燕 《农业工程》2020,10(11):24-28

根据实验室业务及质量管理流程，开发了农机装备综合实验平台管理系统，该系统可以将人员、仪器、方法和文件等数据因素有机结合，通过共享平台对大型仪器进行有效整合和共享，并且提供共享服务，实现共享仪器的网上预约、审核等功能。   相似文献   

Effect of One-off Application of Poly Urea-Formaldehyde Fertilizer Under Reduced N Rate on Double Cropping Rice   总被引：2，自引：0，他引：2  

QiaoYi HUANG  Mu ZHANG  Xu HUANG  ShuanHu TANG  FaBao ZHANG  YuWan PANG  Qiong YI  Ping LI  HongTing FU 《中国农业科学》2018,51(20):3996-4006

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延边地区烟草病毒病与气象因子关系的研究     

高玉亮  高崇  张贵峰  朴龙铁  郑成睿  崔昌范 《延边大学农学学报》2014,(1):74-77,87

为探明延边地区烟草病毒病的发病规律,为生产优质高产烟叶提供科学有效的病毒病预防措施,简要分析了延边地区2010和2011年病毒病与气象因子的关系.结果表明,延边地区进入6月份,当日平均温度高于16.0℃,烟草病毒病就可以发生.病毒病发病前10d的日平均温度高,日照时数大于6h的天数多,降雨量少的情况下,病毒病发生严重.  相似文献   

Infections Investigation of ALV and REV in Guangxi Local Poultry Breeds and Sequence Analysis of gp85 Gene of ALV Isolates     

ZHONG Xing-fu  WANG Pei-kun  YANG Yong-li  QIN Li-li  BI Yu-yu  ZOU Guang-zhen  PENG Hao  WEI Ping 《中国畜牧兽医》2015,42(7):1647-1653

In order to investigate the infection status of avian leukosis virus (ALV) and avian reticuloendotheliosis virus (REV) in the major local breeds of Qinzhou,Guangxi,totally 953 samples of egg white,cloaca swab and serum of Ma duck,Shitou goose,Tiejiao-Ma chicken,turkey and pigeon were collected from the representing flocks and detected by the commercial ELISA kits.ALV was isolated for the ALV p27 positive samples by culturing on DF-1 cells,and gp85 gene was sequenced.The results showed that the detections of ALV were negative in the samples except those of Tiejiao-Ma chicken,while REV antibody was found positive in Ma duck,Tiejiao-Ma chicken and turkey.The nucleotide sequences of gp85 gene of two isolates shared 94.5% identity with each other,and shared 86.9% to 94.9% with reference strains.The amino acid sequences of gp85 gene of two isolates shared 91.5% identity with each other,and shared 84.0% to 91.6% with reference strains.There were many variable sites in the hyper variable region hr1 and hr2,and the vr2 and vr3 variable regions were relatively conservative.Phylogenetic tree analysis showed that the two isolates shared the highest homology with SCAU11-XG strain.  相似文献   

长期培肥我国典型黑土玉米氮肥效应的演变趋势   总被引：3，自引：2，他引：1  

李慧  徐明岗  朱平  张文菊  张会民  李忠芳 《植物营养与肥料学报》2015,21(6):1506-1513

【目的】依托中国东北典型农田设置的公主岭黑土长期培肥试验,研究长期培肥条件下黑土地区玉米产量和氮肥效应的时间演变趋势,阐明氮肥利用率和土壤养分之间的相关性,为指导我国建立长期培肥模式和提高氮肥利用率提供依据。【方法】本文选择不同有机肥用量(M0、M30和M60)下不施肥处理(CK)、施氮肥(N)、施磷钾肥(PK)和平衡施肥(NPK),共计12个处理,研究长期培肥对玉米的氮肥农学效率、氮肥当季利用率和氮肥累积利用率的影响。【结果】有机肥料和化肥(NPK)对玉米均具有显著增产效果,有机肥化肥配施可降低玉米产量的变异系数(CV)和提高可持续性指数(SYI)从而保证玉米的持续稳产高产。平衡施肥条件下的氮肥农学效率、当季利用率和累积利用率随着施肥年限的延长呈上升趋势并且达到显著或极显著水平;常量有机肥区和高量有机肥区的土壤肥力得到显著提升,氮肥效应随时间演变趋势分别为变化不显著和显著降低趋势。氮肥利用率与土壤有机碳、土壤全氮、土壤全磷和土壤速效钾呈显著负相关。【结论】在相对较高的肥力条件下,黑土地区玉米氮肥效应呈显著下降或变化不显著的趋势将为高肥力条件下有机肥部分替代化肥提供科学依据。  相似文献