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对影响铁丰31号栽培条件的密度、施肥量、叶面喷肥、化控次数四个因素分别设定三个水平的处理。采用正交表L9进行数据分析处理。结果表明影响铁丰31号大豆新品种产量因素的顺序是：施肥量、密度、叶面喷肥、化控次数;铁丰31号最理想的栽培技术模式是密度1．1万株／667m^2,施肥量为20kg／667m^2,叶面喷肥1次,化控次数1次。密度高于1．1万株／667m^2时,产量与密度呈负相关;密度低于1．1万株／667m^2时,产量与密度呈正相关。产量与叶面喷肥次数、化控次数呈正相关,极差R值分别为8．91和6．17,但并不显著。说明适时适量的叶面喷肥次数和化控次数对铁丰31号大豆品种提高产量有积极的调节作用,但不能起到决定作用。 相似文献
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通过对稻花香2号＂3414＂田间肥效试验,得出稻花香2号的产量与施肥量的三元二次回归方程,获得最佳施肥效应模型。结果表明：稻花香2号的产量与N、P、K的施用量之间有明显的回归关系。最佳施肥量为：N：12.29 kg/667 m2,P：6.78 kg/667 m2,K：6.05 kg/667 m2,最佳产量为554.96 kg/667 m2。 相似文献
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通过对啤酒大麦新品种蒙啤麦1号、垦啤麦7号的不同施肥水平试验,探索不同施肥水平对这两个大麦品种产量指标的影响;旨在确定内蒙古东部旱作生态区啤酒大麦的最佳施肥量,为今后内蒙古自治区东部旱作区大麦优质、高产、高效生产提供理论依据.通过试验表明:在本次肥料试验中,蒙啤麦1号的生产潜力高于垦啤麦7号;蒙啤麦1号的最高产量为405.39 kg/667 m2,垦啤麦7号的最高产量为349.8 kg/667 m2;蒙啤麦1号施肥量在10.0～20.0 kg/667 m2范围内,其产量变幅为372.28～405.3 kg/667 m2,千粒重变幅为50.8～51.6 g;垦啤麦7号施肥量在10.0-20.0 kg/667 m2范围内,其产量变幅为320.9～349.8 kg/667 m2,千粒重变幅为43.2～44.8 g. 相似文献
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《作物研究》2020,(3)
为明确洞庭湖区机收夏玉米适宜的化学调控措施,完善机收夏玉米高产栽培技术体系,于2017～2018年以胺鲜·乙烯利为化控剂,在3个密度下(60 000、75 000、90 000株/hm~2)研究了3种化控处理(拔节初期1次化控、拔节初期+大喇叭口期2次化控、不化控对照)对夏玉米湘农玉27号产量形成的影响。结果表明:2017年因天气条件不利,群体长势较弱;2018年天气正常,玉米长势较好。两年玉米叶面积指数均随密度增大而显著增大、随化控次数增加而下降。干物质积累量,2017年随化控次数增加而下降,2018年中低密度下表现为:对照1次化控2次化控;高密度下表现为:1次化控对照2次化控。两年玉米产量随密度增大而显著提高;2017年玉米产量因化控而降低,2018年玉米产量受化控及化控与密度互作的影响,中低密度下对照1次化控2次化控,高密度下1次化控对照2次化控,高密度+1次化控处理产量最高。可见化控对洞庭湖区夏玉米产量的影响与群体长势有关,群体长势较差情况下化控导致玉米减产,而群体长势较好情况下拔节初期1次化控结合高密度栽培(90 000株/hm~2)可以获得理想产量。 相似文献
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研究了不同N、P、K及密度配合，以及化控措施对赣豆4号产量和经济性状的影响。结果表明：处理6（A2B3C1D2)、8（A3B2C1D3）、4（A2B1C2D3）产量最高，分别为2835.84kg/hm^2、2818.08kg/hm^2和2816.28kg/hm^2。密度和K肥对产量影响达极显著水平，N肥影响达显著水平，而P对产量的作用不大。K能促进产量构成因子的形成，提高单株生产力。随着密度增大、N肥用量的增加，株高增加，分枝减少，单株荚数、粒数、单株生产力降低，百粒重减轻。P对促进分枝、提高单株荚数有一定的作用。多效唑、叶面喷肥、钼酸铵拌种、根瘤菌拌种分别比常规种植增产14.39%-5.16%。高产试验平均产量达2673.6-2814.3kg/hm^2，最高产量达3429kg/hm^2，高产示范平均产量2496.5kg/hm^2。 相似文献
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在绿色标准化生产条件下，研究了播种期、密度和施肥量三因素对绿豆新品种冀绿7号产量和品质的影响，研究结果表明：播种期对冀绿7号夏播绿豆产量的影响最大，其次是密度，最后是施肥量：冀中南地区夏播绿豆产量和品质影响因素的最优组合是6月20日播种、密度112万株／667m^2、施肥量10kg／667m^2。 相似文献
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Sena L.P. VanderJagt D.J. Rivera C. Tsin A.T.C. Muhamadu I. Mahamadou O. Millson M. Pastuszyn A. Glew R.H. 《Plant foods for human nutrition (Dordrecht, Netherlands)》1998,52(1):17-30
In the western Sahel, indigenous plants become important staples when cereal harvests are inadequate to support populations inhabiting that region of Africa. The purpose of this study was to assess the nutrient content of several of these edible wild plants. The leaves of the following seven plant foods were analyzed: Ziziphus mauritiana, Cerathotheca sesamoides, Moringa oleifera, Leptadenia hastata, Hibiscus sabdarifa, Amaranthus viridi, and Adansonia digitata. The fatty acid, vitamin E, carotenoid, selected mineral and amino acid contents of these plant foods were determined. These same analyses were performed on the fruit of the Adansonia digitata. In quantitative and qualitative terms, Amaranthus viridis was found to be an excellent source of protein. Its amino acid composition compared favorably to that of a World Health Organization (WHO) protein standard. It also contained considerable amounts of the two fatty acids that are essential in humans (linoleic and -linolenic) and a number of minerals including iron, magnesium, calcium and zinc. The leaves of Hibiscus sabdarifa contained an appreciable quantity of protein the composition of which was comparable to the WHO standard. The mineral content of the leaves of this plant was also exceptionally high; noteworthy was its high zinc content. H. sabdarifa also contained significant quantities of the two essential fatty acids. Ziziphus mauritiana was an excellent source of the essential fatty acid linoleic acid and several of the metals including iron, calcium, magnesium and zinc. Its content of other essential nutrients, however, was rather low. In general, Adansonia digitata leaves were nutritionally superior to the fruit of the tree; however, the fruit did contain useful quantities of potassium, phosphorus, zinc and -linolenic acid. The Leptadenia hastata leaves were an especially good source of lutein and -carotene. These data should be useful to the people who inhabit the western Sahel in helping them devise healthy diets during times when cereal staples are in short supply. 相似文献
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通过电解质外渗法和匍匐茎恢复试验对‘阳江’狗牙根及其12个通过形态鉴定选出的坪用价值高且花序密度低的诱变后代进行抗寒性鉴定。电解质外渗法结果表明:诱变后代间的抗寒性具有较大差异,其叶片半致死温度(LT50)的变异范围为-7.6～-0.2℃(最低值与最大值相差7.4℃);参试材料抗寒性由强到弱依次为M18>M4>M26>M28> M22>阳江>M29>M31>M10>M37>M16>M1>M25,其中,有5个诱变后代抗寒性优于亲本,分别是M18、M4、M26、M28、M22。匍匐茎恢复实验结果表明:诱变后代M1、M22、M26、M31、M25在0℃和-5℃低温胁迫后的恢复生长率都高于亲本,恢复能力均优于亲本;M10、M37、M28在-5℃低温胁迫下,恢复生长能力低于亲本,抗寒性相对较弱,M16和M4在0℃和-5℃低温胁迫下,恢复生长率都低于亲本,抗寒性明显弱于亲本。综合2种方法鉴定结果显示:诱变后代M1、M25的恢复能力较强;M4、M28的叶片抗寒性较好,青绿期较长;M22、M18、M26的叶片抗寒性和匍匐茎恢复能力均较强;M29,M31的叶片抗寒性和匍匐茎恢复能力与亲本相似;M10、M16、M37的叶片抗寒性和匍匐茎恢复能力均较弱,整体抗寒性较弱。 相似文献
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橡胶树丛枝病病原的抗血清制备与应用 总被引：5，自引：1，他引：4
以感染橡胶树丛枝病病原的长春花为材料,制备得到橡胶丛枝病病原菌抽提液,以抽提液为抗原免疫家兔,制备抗血清,经微量沉淀测定,抗血清效价为１：２０４８。应用橡胶丛枝病抗血清检测橡胶褐皮病,无症苗木检出率达３０％－３７％,可疑的褐皮病树检出率达８５．７％。 相似文献
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R. W. Summers 《Crop Protection》1989,8(6):451-454
One hundred and fifty-six pre-roost gatherings of starlings were observed at 28 sites around a roost in west Norfolk during winter. Pre-roost gatherings occurred more frequently at individual farmyards compared with individual fields, but 82% of the sites where gatherings occurred were on fields. The size of gatherings was greater, the closer to the roost. Birds in pre-roost gatherings on fields of autumn-sown winter wheat spent most of the time feeding and had a diet composed almost exclusively of wheat seeds. Birds in gatherings on grass fields also fed intensively whereas only 31% of birds at farmyards were feeding. The implications that these results have with regard to potential damage to fields of winter wheat and around farmyards are discussed. 相似文献
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以‘福桐’、‘绿桐’2个无性系与10个不同种源的白花泡桐个体为研究对象，采用ISSR分子标记对12份白花泡桐材料的亲缘关系进行研究，并利用DPSv3.01进行聚类分析。结果表明：10条引物共扩增出66条条带，其中有37条多态带，多态性比例为56.1%。根据ISSR聚类分析结果，在遗传距离为0.35时，12份白花泡桐材料可分为5类，第1类为‘福桐’无性系与河南、河北种源个体；第2类为‘绿桐’无性系与湖南、湖北、江苏种源个体；第3类为浙江、广东种源个体；第4类为江西、福建种源个体；第5类为广西种源个体。此结果 相似文献
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Insect pest management is facing the economic and ecological challenge worldwide due to the human and environmental hazards caused by majority of the synthetic pesticide chemicals. Identification of novel effective insecticidal compounds is essential to combat increasing resistance rates. Botanicals containing active insecticidal phytochemicals appear to be promising to address some of these problems. Therefore, there is a continuous need to explore new active molecules with different mechanisms of action. Secondary metabolites present in plants apparently function as defense (toxic), which inhibits reproduction and other processes. The phytochemical biomolecules could be used for maximizing the effectiveness and specificity in future insecticide design with specific or multiple target sites, while ensuring the economic and ecological sustainability. In this article, the current state of knowledge on phytochemical sources and insecticidal activity, their mechanism of action in insects, resistance, and promising advances made in phytochemical research are reviewed. 相似文献
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为深入研究昆虫病原真菌蝉拟青霉疏水蛋白PChyd基因的功能,根据蝉拟青霉基因组信息克隆疏水蛋白PChyd基因,对该基因序列进行生物信息学分析,使用qRT-PCR技术对其在不同培养条件或阶段下的表达模式进行分析,并通过酶切酶连的方法构建了该基因的敲除载体。结果表明：PChyd基因的开放阅读框序列全长303 bp,编码100 aa,包含22 aa的信号肽序列和70 aa疏水蛋白功能区域。系统发育分析显示该基因与粗糙虫草菌亲缘关系最近。qRT-PCR结果显示PChyd基因在PDA培养的菌丝体、诱导的附着胞、诱导的芽生孢子中表达量显著高于另外2个样品,其中芽生孢子表达量最高,暗示该基因在蝉拟青霉侵染初期和在昆虫血腔中定殖阶段可能具有重要作用。凝胶电泳结果表明,成功构建了该基因的敲除载体,扩增出含有上臂、HPH、下臂的3356 bp左右的片段。本研究为进一步探究蝉拟青霉疏水蛋白PChyd基因的致病机理、生防工程菌的改造奠定了基础。 相似文献