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棉花辣椒套种,是合理利用空闲棉地提高复种指数和经济效益的一条新路子。近年来,我们就此作了大量的试验探素,总结了众多的群众经验,实践证明这项技术不仅经济效益十分明显,而且可实现棉菜双丰收,是农民快速致富、早日奔小康的好门路。1992年我县推广辣椒棉花套种0.66kha。每公顷收 相似文献
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乐港镇地处江西省乐平县城郊。由于该地人均只有耕地300～400m~2,既要以市场为导向提高经济效益,又要完成棉花生产任务,因此,许多干群都在探索棉花与其他经济作物间作套种实现爱国发家的新门路。乐港镇陈德周同志1991年在陈高村进行了“棉花与辣椒间作”试验,试验结果表明:经济效益好,实现了皮棉单产1995kg/ha,产值1.70万元/ha(包括超购奖),鲜辣椒16245kg/ha,产值1.73万元/ha,两项合计每公顷产值3.43万元。如将冬季在 相似文献
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江西省永丰县是首批“全国无公害蔬菜生产示范基地县”，早春大棚辣椒生产是其主导产品。常规做法是在4月中旬前后掀去棚膜后，在辣椒畦中央开果蔗定植沟，实行辣椒与果蔗套种栽培，由于果蔗属常规季节栽培，市场竞争优势不明显。据此，我们进行了深入研究，利用早春塑料大棚的增温保温性将果蔗提前定植到棚内，与辣椒共享棚内优越的光温肥水条件，辣椒与果蔗套种优势凸现，果蔗的上市期大为提前，套种模式取得了每亩产值6500元以上的好效益。 相似文献
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豇豆的高效、优质、无公害化种植生产技术是解决豇豆产品多年来产量低、品质劣、农残超标等难题的关键。引进"台湾9号"豇豆新品种,经过适应性种植生产对比试验,总结品种特性,为大面积无公害化种植推广提供依据。 相似文献
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冬种辣椒是广东冬季农业生产的支柱产业。但冬种辣椒生产常常受寒潮、连阴雨、干旱等灾害性天气的威胁。调查广东省冬季气象灾害的发生规律,结合冬种辣椒的生长和栽培特点,探讨广东气象条件与冬种辣椒生产的关系,分析冬种辣椒面临的主要气象灾害的发生规律、特征及其对辣椒生产的影响。辣椒属喜光喜温作物,同时根系较浅,对水分要求严格。寒害是冬季辣椒生产面临的主要气象灾害;2、3月份的低温阴雨天气主要发生在粤北和珠三角地区,容易给辣椒造成渍害和湿害;冬季干旱发生频率也较大,珠江口北部以及雷州半岛地区是重点防范区域;而在全球变化 相似文献
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胡麻套种玉米的理论基础与栽培实践 总被引：2，自引：0，他引：2
本文以胡麻套种玉米立体种植模式为研究对象,着重对其在宁南山区灌溉农业区发展的可行性,经济、生态、社会等综合效益及栽培技术规程进行了分析、鉴定和探索。结果表明,当地具备发展胡麻套种玉米的气候资源和社会经济条件;在胡麻套种玉米的生态系统内,通过增加物质投入,优化技术组合其生物生产力、经济产值、人工辅助能转化效益、资源利用效率和物质循环通量可获同步提高;搭配品种、优化带型、肥水管理是胡麻套种玉米栽培技术的关键。 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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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
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为了寻找一种高效的荔枝果实瞬时基因表达方法,本研究以荔枝品种‘新球蜜荔’（Litchi chinensis Sonn. var. ‘Xinqiumili’）为试材,利用农杆菌注射法对荔枝果实组织进行转化,研究了果实发育时期、菌株种类、注射部位、取样时间、菌液浓度等对转化效率的影响。结果表明：选择果肉已完全包裹种子的Ⅱb期果实进行连体注射,在果柄、果皮、种子、果肉分别注入OD600值为2.4的农杆菌菌株GV3101,4 d后取样进行检测,4个组织的GUS染色率较高。本研究成功建立了适用于荔枝果实的基因瞬时表达系统,为今后快速鉴定荔枝果实相关基因功能提供了基础。 相似文献
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2020年10月17日,《中华人民共和国生物安全法》(以下简称《生物安全法》)通过全国人大常委会的审议,自2021年4月15日起施行.生物技术的研究与应用安全是《生物安全法》涉及的主要内容之一,基因编辑作为近几年生物技术领域的研究热点,其安全性评价和监管备受关注.本文概述了基因编辑技术的应用现状,比较了不同国家对基因编... 相似文献