The priority of management factors for reducing the yield gap of summer maize in the north of Huang-Huai-Hai region,China          下载免费PDF全文

Yue-e LIU  Yu-xin LI  Tian-fang LÜ  Jin-feng XING  Tian-jun XU  Wan-tao CAI  Yong ZHANG  Jiu-ran ZHAO  Rong-huan WANG 《农业科学学报》2021,20(2):450-459

Understanding yield potential, yield gap and the priority of management factors for reducing the yield gap in current intensive maize production is essential for meeting future food demand with the limited resources. In this study, we conducted field experiments using different planting modes, which were basic productivity(CK), farmer practice(FP), high yield and high efficiency(HH), and super high yield(SH), to estimate the yield gap. Different factorial experiments(fertilizer, planting density, hybrids, and irrigation) were also conducted to evaluate the priority of individual management factors for reducing the yield gap between the different planting modes. We found significant differences between the maize yields of different planting modes. The treatments of CK, FP, HH, and SH achieved 54.26, 58.76, 65.77, and 71.99% of the yield potential, respectively. The yield gaps between three pairs: CK and FP, FP and HH, and HH and SH, were 0.76, 1.23 and 0.85 t ha~(–1), respectively. By further analyzing the priority of management factors for reducing the yield gap between FP and HH, as well as HH and SH, we found that the priorities of the management factors(contribution rates) were plant density(13.29%)fertilizer(11.95%)hybrids(8.19%)irrigation(4%) for FP to HH, and hybrids(8.94%)plant density(4.84%)fertilizer(1.91%) for HH to SH. Therefore, increasing the planting density of FP was the key factor for decreasing the yield gap between FP and HH, while choosing hybrids with density and lodging tolerance was the key factor for decreasing the yield gap between HH and SH.  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   

平原河网地表水空间分布特征——以嘉兴市为例     

祝新明  李莉  王翡  吴伟超 《安徽农业科学》2021,49(2):38-41

以布设在嘉兴市主要水系32个水质自动监测站2019年水质监测数据为基础,综合运用主成分分析和聚类分析等多元统计分析方法,对嘉兴市平原河网地表水的空间分布特征进行分析.结果表明,主成分分析表明嘉兴市平原河网地表水主要受总磷、氨氮、总氮等指标的影响,pH、溶解氧、电导率、高锰酸盐指数等指标的影响较小.聚类分析表明嘉兴市平原河网水系主要分为3类,第1类以澜溪塘为代表的河道,水质较好;第2类为南部排入钱塘江、东部排入黄浦江、中部环嘉兴市区河道,水质次之;第3类为西部和北部入境河道,水质最差;聚类分析结果与主成分综合评判结果基本一致.  相似文献   

互联网+环境下饲料品牌的策划和实践     

王雯 《中国饲料》2021,(2):94-97

随着市场环境的不断发展变化,消费者越来越重视产品的品牌效益,品牌建设已成为当前饲料企业市场竞争中取胜的重要法宝,饲料企业可通过品牌策划与实践提升产品的知名度,加强企业自身的商业信誉,从而提升饲料产品的销售份额,有效扩大消费群体,为企业的长远发展提供广阔的潜力。因此,饲料企业要重视互联网+环境下品牌的策划与实践,通过优化策划方案、创新推广路径等方式加强企业品牌建设。  相似文献   

猫传染性腹膜炎研究进展     

尹伊娅  刘晓雅  王朝好  李婷  胡长敏 《畜牧兽医学报》2020,51(5):933-942

猫传染性腹膜炎是一种全身性、致死性的病毒性疾病,为幼猫和青年猫死亡的主要原因之一。近年来,该病在世界各地广泛流行,并呈一定的上升趋势。越来越多的学者对其进行了研究与探索,但其致病与免疫机制仍未完全清楚。本文从病原学、发病机制、流行病学、临床症状、诊断与治疗以及免疫与预防等方面对猫传染性腹膜炎进行全面的阐述,为该病的科学诊治与防控提供参考和指导。  相似文献   

Whistle signal variations among three Indo-Pacific humpback dolphin populations in the South China Sea: a combined effect of the Qiongzhou Strait's geographical barrier function and local ambient noise?     

Jing YUAN  Zhitao WANG  Pengxiang DUAN  Yousheng XIAO  Hongke ZHANG  Zhixiong HUANG  Ruichun ZHOU  Hua WEN  Kexiong WANG  Ding WANG 《Integrative zoology》2021,16(4):499-511

Geographic variations in the dolphin whistles could be useful in assessing association and isolation among populations. Whistle of free-ranging Indo-Pacific humpback dolphins (Sousa chinensis) among the Pearl River Estuary (PRE), Leizhou Bei (LZB) and Sanniang Bay (SNB) populations were investigated. A total of 2850 whistles with legible fundamental contour were extracted and 15 acoustic parameters were measured. Contrary to SNB, PRE and LZB had the same relative proportion of tonal type compositions with flat and sine representing the most frequent types. The generalized linear model analysis showed significant acoustic difference among populations and tonal types. All frequency parameters in SNB were significantly higher than those in PRE and LZB, where no significant variation was observed in most of the parameters either at the population level or within each tonal type. Canonical discriminant functions analysis showed a smaller difference between PRE and LZB than between PRE and SNB and between LZB and SNB. Compared with previous recordings, recent recordings demonstrated a consistent pattern of becoming higher in whistle frequency parameters in both LZB and SNB populations, suggesting that noise pollution in LZB and SNB increasing with time according to the acoustic niche hypothesis. Dolphin whistle's geographic variations could be shaped by the combined function of the geographical barrier function of the Qiongzhou strait and local ambient noise. Considering the isolated condition and the relatively smaller population size of the humpback dolphin in the SNB, more effective and proactive conservation actions should be taken to prevent the extinction of small populations.  相似文献   

不同播期对黄秋葵长势、抗病性和产量的影响     

宋聚红  吴然  王海山  刘玉芹 《蔬菜》2019,(1):23-31

为在河北省推广种植黄秋葵,在安国、保定、邯郸、衡水和石家庄5个试验点进行黄秋葵分期播种试验,研究了不同播期对石秋葵1号、红玉和五福3个品种生长势、抗病性和产量的影响。结果表明:播期对石秋葵1号、红玉和五福生长势、抗病性和产量具有较大的影响,随着播期的推迟,3个品种的茎粗大致呈逐渐增高的趋势,株高呈先降后升的趋势(除2018年的红玉外),单株结果数则先增加后减少,单果质量(除五福外)逐渐增大;以4月20日、25日和30日为播期,得到的黄秋葵单株产量和折合667 m~2产量较高。综合得出,河北省黄秋葵种植以4月20日、25日、30日为播期最为适宜。  相似文献   

哈尔滨地区大豆蚜及其天敌昆虫的多年种群动态和相关性分析     

范艳杰  田镇齐  王苏吉  刘健  赵奎军 《大豆科学》2017,36(1)

为明确大豆蚜种群数量与其天敌昆虫龟纹瓢虫[Propylea japonica(Thunberg)]、异色瓢虫[Harmonia axyridia(Pallas)]及花蝽(Orius sp.)的田间发生情况及二者的相关性,采用对角线五点取样、借助直接观察法,对哈尔滨地区大豆蚜及上述天敌昆虫的种群动态(2008-2014年)进行了系统调查。记录各年份大豆蚜种群数量峰值及峰值日后第6天各天敌昆虫的种群数量,并对大豆蚜与天敌昆虫的发生关系进行了相关分析。结果表明:6月为大豆蚜的田间始发期,7-8月为其田间猖獗期,9月为其消亡期。在大豆蚜的始发期和猖獗期,田间均有龟纹瓢虫(成虫和幼虫)、异色瓢虫(成虫和幼虫)及花蝽(成虫和若虫)的发生。龟纹瓢虫幼虫和异色瓢虫成虫的田间种群数量与大豆蚜的种群数量间均呈现显著相关性。  相似文献   

夏训对优秀皮划艇运动员铁调素等铁营养状况以及IL-6的影响     

王力先    赵君军  李捷    廖红娟  丘〓卫  季健民  张〓援 《上海交通大学学报(农业科学版)》2014,(5):102-104

目的：探讨夏训对优秀运动员铁调素等铁营养状况以及IL-6的影响。方法：广东省优秀皮划艇运动员26人(男15人，女11人)参加测试，调查夏训前和夏训后血红蛋白、铁调素、可溶性转铁蛋白受体、血清铁蛋白、可溶性转铁蛋白受体/log铁蛋白、血清铁、总铁结合力、转铁蛋白饱和度以及白介素6变化情况。结果：夏训后，男运动员组铁调素和可溶性转铁蛋白受体极显著上升(P<0.01)、血清铁蛋白极显著下降(P<0.01)，可溶性转铁蛋白受体/log铁蛋白显著上升(P<0.05)，总铁结合力显著下降(P<0.05)，白介素6极显著上升(P<0.01)。女运动员组血红蛋白显著降低(P<0.05)，铁调素和可溶性转铁蛋白受体极显著上升(P<0.01)，血清铁蛋白极显著下降(P<0.01)，可溶性转铁蛋白受体/log铁蛋白极显著上升(P<0.01)，白介素6极显著上升(P<0.01)。结论：夏训可引起运动员炎症因子升高、铁调素升高，导致功能铁不足；铁调素介导的铁代谢紊乱可能是运动性低血色素发生的重要原因。  相似文献   

超学科知识生产模式对农村地区多媒体英语教学的启示     

王永 《农业网络信息》2014,(2):125-127

随着知识经济的兴起,人类传统的知识生产模式正悄然发生革命性的变化。一种被称之为"超学科"的知识生产模式开始崭露头角,它强调知识生产要在多学科共同参与的广阔应用语境下进行,要在各利益方充分商榷、谈判、让步、协调、合作的基础上,形成最终共识,从而找到解决问题的途径。和传统的知识生产模式相比,超学科知识生产模式具有应用语境性、超学科性、异质性、反思性和质量控制标准多元性等典型特征,因而可以对农村地区多媒体英语教学具有良好的启示作用。  相似文献