无公害糯玉米栽培技术   总被引：2，自引：0，他引：2  

徐艳荣  孙发明  焦仁海  侯中运  刘兴二 《黑龙江农业科学》2009,(1):131-132

从产地环境条件、品种选择、隔离种植、种子处理、肥水管理、病虫害防治以及大田管理等方面,介绍了糯玉米无公害栽培技术,以指导吉林省糯玉米的生产。  相似文献   

种植密度对克单10号产量和生理指标的影响     

杨耿斌  刘兴焱  何长安 《黑龙江农业科学》2014,(4):30-33

为了进一步提高玉米产量,以克单10号为试材,在3种植密度下,研究了种植密度对克单10号的产量和生理指标的影响。结果表明:随着种植密度增加,玉米个体产量、主要产量相关性状、单株叶面积及单株地上部干物质积累量均呈现降低的趋势,群体地上部干物质积累量和群体叶面积指数则呈现升高趋势。其中种植密度为4.5万~6.0万株·hm-2时,产量最高。  相似文献   

垄改平对土壤水分及玉米产量的影响     

王辉  刘兴焱  何长安  杨耿斌  纪春学  张恒 《黑龙江农业科学》2014,(10):23-25

为了完善保护性耕作技术,以玉米品种克单14为试验材料,研究常规垄作、灭茬平作、留茬平作对玉米生长发育的影响。结果表明:常规垄作可以促进玉米生长发育,提高苗期地温,灭茬平作和常规垄作处理较留茬平作处理增产。  相似文献   

成品保鲜剂组合对芍药切花的保鲜效果     

刘圆  王昊  王勇  刘兴  陈英  曾军  王妮妮 《现代农业科技》2021,(11)

选取进口芍药‘莎拉’为试材,选择成品保鲜剂可利鲜的预处液、预处液与瓶插液组合对芍药切花进行处理,通过调查瓶插期间切花芍药的瓶插寿命、花朵直径和花朵开发进程等指标,研究成品保鲜剂预处液、预处液与瓶插液组合对切花芍药瓶插保鲜效果的影响。结果表明预处液和预处液与瓶插液组合处理均延长了芍药花期。但预处液与瓶插液组合处理的效果最好,瓶插期比对照CK增加1天,最大花径值与对照CK的差异也达到了显著水平。本研究可为花店或切花生产供应商延长芍药切花瓶插寿命提供参考。  相似文献   

Control of nitrogen export from watersheds by headwater streams   总被引：9，自引：0，他引：9  

Peterson BJ  Wollheim WM  Mulholland PJ  Webster JR  Meyer JL  Tank JL  Marti E  Bowden WB  Valett HM  Hershey AE  McDowell WH  Dodds WK  Hamilton SK  Gregory S  Morrall DD 《Science (New York, N.Y.)》2001,292(5514):86-90

A comparative (15)N-tracer study of nitrogen dynamics in headwater streams from biomes throughout North America demonstrates that streams exert control over nutrient exports to rivers, lakes, and estuaries. The most rapid uptake and transformation of inorganic nitrogen occurred in the smallest streams. Ammonium entering these streams was removed from the water within a few tens to hundreds of meters. Nitrate was also removed from stream water but traveled a distance 5 to 10 times as long, on average, as ammonium. Despite low ammonium concentration in stream water, nitrification rates were high, indicating that small streams are potentially important sources of atmospheric nitrous oxide. During seasons of high biological activity, the reaches of headwater streams typically export downstream less than half of the input of dissolved inorganic nitrogen from their watersheds.  相似文献   

公主岭市玉米生产过程中存在的问题及建议     

徐艳荣  焦仁海  仲义  代秀云  侯宗运  刘兴二 《现代化农业》2015,(2)

公主岭市是全国著名的产粮大市、牧畜大市、农产品加工大市。近年来,随着全国玉米消费快速增长,出现供求趋紧的局面,造成公主岭市饲用玉米紧缺和价格大幅上升,严重地影响到畜牧业发展和人民生活水平的提高。因此,大力发展公主岭市玉米生产,解决玉米生产过程中存在的问题,具有十分重要的现实意义。  相似文献   

大黄鱼选育群体与野生群体杂交 F1生长性状研究     

郑炜强  黄伟卿  韩坤煌  刘招坤  张艺  刘兴彪  柯巧珍  陈佳 《水产科学》2014,(11)

利用大黄鱼野生群体与选育F1养殖群体杂交及群体内自繁,获得选育F1（♀）×野生（♂）、野生（♀）×选育F1（♂）、野生（♀）×野生（♂）和选育F1（♀）×选育F1（♂）4个组合的子代,对其卵径、油球径以及2～10月龄全长、体长和体质量进行分析比较。试验结果表明,选育F1（♀）×野生（♂）卵径最大,并与野生（♀）×野生（♂）之间存在显著性差异（P＜0．05）,4个群体油球径差异不显著（P＞0．05）;体质量是大黄鱼群体间杂交主要表现的生长性状,9月龄体质量双亲杂种优势最大为14．48％,野生（♀）×选育F1（♂）体质量杂种优势最大为25．68％;野生（♀）×选育F1（♂）的全长特定生长率为1．92％／d ,体质量为5．60％／d及选育F1（♀）×野生（♂）体长为1．99％／d ,是4个群体中最大特定生长率;拟合体长（L）与体质量（m）关系,选育F1（♀）×野生（♂）为 m＝0．0277L2．8045（r2＝0．9980）,野生（♀）×选育F1（♂）为 m＝0．0210 L2．9287（r2＝0．9993）,野生（♀）×野生（♂）为 m＝0．0236 L2．8592（r2＝0．9916）,选育F1（♀）×选育F1（♂）为 m＝0．0228 L2．8946（r2＝0．9984）。试验结果表明,通过野生群体与选育养殖群体的杂交能提高大黄鱼子代的经济性状。  相似文献   

Aquatic birnavirus induces apoptosis through activated caspase-8 and -3 in a zebrafish cell line     

Hong JR  Huang LJ  Wu JL 《Journal of fish diseases》2005,28(3):133-140

In this study, the possible influence of temperature on infectious pancreatic necrosis virus (IPNV)-induced apoptosis in a zebrafish liver epithelium (ZLE) cell line was investigated. At a lower temperature (18 degrees C), there was expression of viral proteins VP2 and VP3 at 4 h post-infection (p.i.). At this time no expression was found in the high temperature group at 28 degrees C. The cell survival ratio was 52 and 18% at 24 and 48 h p.i., respectively, during IPNV infection at 18 degrees C. In addition, we assayed for apoptosis in IPNV-infected cells with terminal deoxynucleotidyl transferase (TdT)-mediated end labelling (TUNEL) of DNA at different dosages of virus. We found a ratio of apoptotic cells of 8 and 25% at 12 and 18 h p.i., respectively, in the multiplicity of infection (MOI) 1 group. The MOI 10 group had 20 and 45% apoptotic cells at 12 and 18 h, respectively. Furthermore, at 18 degrees C IPNV activated the caspase-8 and 3 from 1.5 to 2 times at 12 and 18 h p.i., respectively. Taken together, these findings suggest that successful virus replication occurs at the low temperature (18 degrees C) compared with the non-permissive temperature of 28 degrees C. Thus, IPNV replication is capable of activating caspase-8 and -3 and inducing host apoptosis.  相似文献   

盘锦地区胡椒薄荷植物学性状和精油含有率日变化的研究     

曾军  王勇  陈英  刘圆  王昊  刘兴 《河北农业科技》2011,(1):58-59

本研究通过对盘锦地区引种成功的胡椒薄荷（Menthapiperita）精油含有率日变化进行试验,分析出不同时间对胡椒薄荷精油含有率产生的影响,为进一步确定胡椒薄荷最佳采摘时间提供了科学依据。试验结果表明：胡椒薄荷一天之中精油含有率最高时间点在17：00,可达1.75ml100gFw。  相似文献   

Factors that alter rumen microbial ecology     

Russell JB  Rychlik JL 《Science (New York, N.Y.)》2001,292(5519):1119-1122

Ruminant animals and ruminal microorganisms have a symbiotic relationship that facilitates fiber digestion, but domestic ruminants in developed countries are often fed an abundance of grain and little fiber. When ruminants are fed fiber-deficient rations, physiological mechanisms of homeostasis are disrupted, ruminal pH declines, microbial ecology is altered, and the animal becomes more susceptible to metabolic disorders and, in some cases, infectious disease. Some disorders can be counteracted by feed additives (for example, antibiotics and buffers), but these additives can alter the composition of the ruminal ecosystem even further.  相似文献