施肥对早稻品质的影响   总被引：1，自引：0，他引：1  

吴自明  李辉婕  石庆华  潘晓华  李木英 《农机化研究》2006,(8):137-140

为研究施肥对早稻品质的影响,2000~2001年在芦溪县分别进行了N、K不同施肥量和不同施肥方式对早稻赣早籼48与早稻香两优68品质影响的研究。结果表明:出糙率、精米率和蛋白质含量都随着施N量增加而增加,直链淀粉含量随N肥用量增加而略有减少趋势;精米率、整精米率、直链淀粉含量和蛋白质含量随着K肥用量增加而增加;中N(150kg/hm2)、高K(135kg/hm2)处理互作效应最大,比较适合当地优质早稻赣早籼48施用。施肥方式以生物有机肥配合化肥全层施肥,中后期补施穗肥的出糙率、精米率、整精米率和稻米的蛋白质含量都能提高,直链淀粉含量降低。  相似文献   

大数据时代山东农业病虫害监测预警体系建设     

刘君  王学伟 《北方园艺》2021,(3):166-170

在大数据时代,海量的数据资源是推动经济发展和社会进步的基石,丰富、透明、完善的农业大数据资源是加快农业信息化建设步伐的前提,先进、有序、完备的农业病虫害监测预警体系是服务绿色农业发展的支撑。该研究试图在研究国内外农业病虫害监测预警体系的基础上,在农业专家的指导下,进行大数据时代农业病虫害监测预警体系构建。山东农业病虫害监测预警体系的建设应主动适应大数据时代的发展需求,分步构建病虫害监测预警体系,分层划分病虫害数据中心工作,合理布局病虫害数据采集站点,科学制定病虫害监测预警任务,共建共享病虫害监测数据信息,有效加强病虫害联合监测预警,努力研发病虫害智能识别终端,为发展现代高效农业提供坚实的保障。  相似文献   

早籼型水稻温敏核不育系M103S的选育与光温反应特性   总被引：3，自引：2，他引：3  

牟同敏  李春海 《华中农业大学学报》2003,22(3):213-218

以温敏核不育水稻安农S—1为母本，以常规高产早籼稻品系92153为父本进行杂交，通过低温选择和人工气候箱鉴定，育成了育性转换临界温度23—24℃的早籼型温敏核不育系M103S。光周期长于12．5h，日平均温度高于24℃，可以用于制种，日平均温度低于23℃，可以用于繁殖。光周期长于13．5h，日平均温度高于23℃，可以用于制种。自然条件下不育起点温度为日均温23—24℃，耐低温期为3—4d。敏感期为抽穗前的7—14d。播始历期为53—79d，主茎叶片数10．0—12．6片。从播种到始穗的活动积温和有效积温，分别为1493．8—1766．3℃和733．4—1058．3℃。不育期的株高63．6—77．5cm，平均72．0cm，单株有效穗6．4—12．0个，平均9．3个，穗长20．9—22．7cm，平均21．2cm，每穗颖花数112．1—137．3朵，平均122．3朵。可育期株高65．7cm，单株有效穗7．2个，穗长17．2cm，每穗总粒数114．1粒，结实率47．23％，千粒重31．34g。以M103S为母本，与100多个早籼品种进行测配，杂种表现生育期早、穗大、粒多、千粒重高。  相似文献   

后金融危机时代中小企业财务危机预警管理     

孙群  阮文彪 《安徽农业大学学报》2011,(3):53-57

2008年的全球性金融危机给我国中小企业带来了巨大的冲击，绝大多数中小企业陷入了财务困境，甚至破产倒闭。在后金融危机时代，我们应该吸取经验教训，提高中小企业财务危机意识，加强财务危机的预警，防患于未然，因此建立中小企业财务危机预警模型成为刻不容缓的任务之一。文章尝试在传统的基于功效系数法下构建的中小企业财务危机预警模型中加入了关键性的非财务指标，试图通过定量与定性指标的结合，以期增加模型的全面性与准确性。  相似文献   

民优5338早季栽培综合措施试验初报     

梁汉华 《福建稻麦科技》2016,(1):24-28

为摸索杂交稻品种民优5338相配套的早季高产栽培技术措施,采用正交设计法开展民优5338早季栽培的三因素(插植规格、每667m~2施纯N量、N肥施用方法)试验,结果表明:采用插植规格20 cm×20 cm、每667m~2施纯N量16 kg和N肥施用方法(基肥∶蘖肥∶穗肥=5∶3∶2)组合的栽培效果最佳,适宜生产推广。  相似文献   

Spawning success and early life history of longnose suckers in Great Lakes tributaries          下载免费PDF全文

Evan S. Childress  Rebecca Papke  Peter B. McIntyre 《Ecology of Freshwater Fish》2016,25(3):393-404

Fish eggs and larvae are often subject to very high mortality, and variation in early life survival can be important for population dynamics. Although longnose suckers (Catostomus catostomus) are widespread in northern North America, little is known about their early life history. We examined fecundity and early larval survivorship during sucker spawning events in three small Lake Michigan tributaries. Although egg deposition varied 25% among spawning events, estimated larval export to the lake varied over 25,000‐fold from around 1000 to 26 million. Based on variation in environmental conditions across years, it appears that spring flow and temperature may be important determinants of egg survival to larval outmigration. Larval age data suggest that most individuals that survived to outmigration hatched during a 2‐day period despite adult spawning across at least 10 days. Most larvae spent <2 weeks in the stream and emigrated around the time of transition from endogenous to exogenous feeding before substantial growth occurred. In two of three cases, larvae drifted exclusively at night; however, high drift rates occurred during both day and night in the case where larvae were very abundant, suggesting density‐dependent drift behaviour. Our results indicate that survival in tributary streams from egg deposition to larval export is highly variable in longnose suckers. These large differences in early life survival may translate into variability in recruitment, thereby influencing population structure and dynamics.  相似文献   

代乳料原料组成对早期断奶羔羊生长及脏器发育的影响     

李典芬  张鹏坤  魏时来  李伟  黄殿选  陈颢  李桂英  赵玉军  王志鹏 《草业科学》2010,27(8):129-133

为了探讨代乳料原料的不同组合效应对早期断奶羔羊的饲喂效果,选取25只甘肃高山细毛羔羊,分为5组,每组5只,对照组羔羊由母羊自由哺乳和放牧;试验组羔羊30日龄断奶,饲喂4种代乳料:A组主原料未膨化,B组主原料膨化,C组主原料膨化+血浆蛋白粉,D组在C组基础上增加乳清粉。试验期为30~90日龄。结果表明:50、70日龄时,对照组羔羊体质量最大,试验组羔羊受断奶应激的影响,相应指标较小。90日龄时,D组体质量显著高于B、C组(P0.05),超过了对照组。30~90日龄阶段,D组日增体质量最大,且显著高于B、C组(P0.05)。对照组脾脏质量显著高于4个试验组(P0.05),且脾脏指数最高。说明在代乳料中添加血浆蛋白粉及增加乳清粉,有利于羔羊健康发育,使代乳料的饲喂效果最佳。  相似文献   

早期阅读误区与少儿图书馆应对措施     

黄碧 《农业图书情报学刊》2010,22(10):199-201

早期阅读是培养和提高学前儿童语言、想象、思维、情感、审美等能力的重要途径。针对早期阅读存在的误区,从少儿图书馆的角度提出了转变传统观念、完善服务设施、提高图书馆员综合素质、保障经费来源等应对措施。  相似文献   

Developmental temperature stress and parental identity shape offspring burst swimming performance in sockeye salmon (Oncorhynchus nerka)     

Jenn M. Burt  Scott G. Hinch  David A. Patterson 《Ecology of Freshwater Fish》2012,21(2):176-188

Abstract – The persistent effects of embryonic temperature stress and individual parentage on fry swimming performance were examined in a cross‐fertilisation experiment using sockeye salmon (Oncorhynchus nerka). A fixed‐velocity test of burst swimming was used to assess the endurance capacity and behavioural performance of individual fry from 10 offspring families incubated at 12, 14 or 16 °C to hatch and then reared through yolk absorption and exogenous feeding stages in a common posthatch environment (average 6.9 °C). Fry burst swim time (BST) was influenced by an interaction between incubation temperature and family identity. Average BST was longer for fry from the 12 °C prehatch treatment compared to 14 and 16 °C, although differences were largely attributable to temperature effects on average fry size. Behavioural observations revealed that fish incubated at 16 °C performed more poorly, having a larger proportion of individuals that required stimulation to swim, fatigued more frequently or were classified as ‘nonswimmers’. Within all three incubation temperature treatments, mean BST varied significantly among offspring families, independent of fry mass and length. An interesting relationship was observed within the 16 °C treatment, whereby families with higher survivorship were characterised with lower mean BSTs. Collectively, these findings demonstrate that exposure to high temperatures in early sockeye salmon development can result in persistent, parentally mediated effects on fry performance. As such, these results provide important insight into how elevated temperature events during egg incubation may affect early life history selection processes and survival in stages beyond when the stressor is experienced.  相似文献   

Developmental Dynamics and Early Growth Vigour in Rice. I. Relationship Between Development Rate (1/Phyllochron) and Growth     

M. C. Rebolledo  M. Dingkuhn  P. Péré  K. L. McNally  D. Luquet 《Journal of Agronomy and Crop Science》2012,198(5):374-384

Achieving early vigour, that is, rapid dry matter accumulation, is a priority in rice crop improvement, but this trait is complex and not well understood genetically and physiologically. This study tested the hypothesis that the development rate (DR) contributes to early vigour. Two diversity panels were phenotyped during vegetative stage for traits constituting early vigour (shoot dry weight, SDW; relative growth rate, RGR) or contributing to early vigour (tillering, leaf size, DR). The first panel comprised 169 genotypes from all major genetic groups of Oryza sativa and was phenotyped under irrigated upland conditions in the field (Philippines, Exp1). The second panel with 190 genotypes representing the diversity of the tropical japonica group was phenotyped in pots in a greenhouse (Montpellier, France, Exp2). Results from field and pot experiment pointed out that DR, tillering and leaf size were positively correlated with RGR and SDW, although the contribution of leaf size was small. DR was positively correlated with tillering but both were negatively correlated with leaf size. DR vs. RGR correlation was conserved in subsets of genotypes with similar leaf size and tillering, suggesting an effect of DR on RGR independent of the other traits. DR is a promising, still underexploited trait contributing to rice early vigour, requiring further genetic and physiological characterization.  相似文献