宁夏新疆杨扦插繁育技术要点

主要介绍宁夏新疆杨苗木扦插繁育技术,主要技术环节包括：穗条采集,浸泡,扦插,灌水,施肥,抹芽,病虫害防治等。     

枸杞苗木繁育技术研究

枸杞苗木繁育技术包括有性繁殖和无性繁殖。有性繁殖主要是种子育苗,用于杂交育种中新种质材料的繁育;无性繁殖主要包括嫩枝扦插、硬枝扦插和组织培养技术,是目前枸杞生产中普遍采用的苗木繁育技术。文章对枸杞苗木繁育技术进行了研究,对枸杞种子育苗和嫩枝扦插育苗的关键技术进行了阐述。     

葡萄快速育苗法--绿枝扦插

葡萄绿枝扦插是在生长期中,以当年生长的绿枝作插条,也就是结合夏季修剪,利用剪下来的枝条进行扦插,繁殖苗木.利用这种方法繁育苗木具有成本低、占地面积小、幼苗根系发育好、成活率高、成苗快等优点.具体做法是:     

河北杨苗木培育技术

从种条采集、剪穗、沙藏处理、苗圃地选择、扦插、抚育管理、大苗培育等方面介绍了河北杨苗木培育技术,为河北杨在宁夏乃至周边地区繁育推广,提供了成功经验。     

桑树硬枝扦插育苗技术

桑树育苗一般有3种,即播种育苗、嫁接育苗和扦插育苗.近年来,很多蚕农反映一些良种桑苗较难繁育,扦插不易生根成活,为此笔者利用采收桑叶后的硬枝进行扦插,从扦插到苗木移栽大田仅需50～60天,所培育的苗木根系发达,生长迅速,抗逆性强,操作简单,易被蚕农接受.     

丹桂苗木繁育技术研究

介绍了丹桂苗木繁育技术,主要包括扦插苗繁育、实生苗繁育、嫁接苗繁育等内容,以期为丹桂的苗木繁育提供技术参考。     

耐盐植物全日照喷雾扦插技术的研究

采用全日照喷雾扦插育苗技术对 7种耐盐苗木进行扦插试验。结果表明 :插穗树龄及插穗的处理是扦插成功的关键 ,激素处理能显著提高插穗的生根率。林生山黧豆、沙枣、银白杨和绒毛白蜡夏季扦插极易生根 ,且 2级侧根发达。在砂壤土中移栽成活率明显高于粘土中的成活率 ,在 2级侧根生长旺盛时期移栽繁育苗木为最佳。采用全日照喷雾扦插技术繁育的苗木与同期用种子繁育的苗木相比 ,移栽后生长快、分枝多、匍匐直径大 ,且耐盐能力增强     

新疆匍匐石榴载培技术讲座(三)

五、匍匐石榴的苗木繁育和建园 1.苗木繁育 苗木繁育可采用分蘖繁殖和扦插育苗.①分蘖繁殖在秋末落叶后埋土前或春季出土后萌芽前,将根蘖苗尽量多带根系挖出,即成为可定植的石榴根蘖苗.     

浅析沙地柏扦插繁育及苗木栽培技术

专家通过对沙地柏育苗前准备、扦插技术、苗期培育、扦插后的管理技术等方面的实践,深入研究了沙地柏扦插繁育及苗木栽培技术,为繁育沙地柏提供更好的技术支持,也为生态建设提供参考。     

葡萄绿枝扦插育苗技术

葡萄绿枝扦插是在葡萄生长季节,利用夏剪时剪下的半木质化新稍（副梢或主梢）做扦插材料进行扦插繁殖的一种重要方法,在苗木紧缺及插条有限的情况下,可以达到快速繁育良种苗木的目的,绿枝扦插成苗的关键是插条本身状况和调控扦插环境的温湿度。     

穴盘规格和苗龄对塑料大棚菜豆性状及产量的影响

本试验以菜豆品种先行者为试材,采用32孔、50孔两种规格穴盘,设置10、15、20、25 d等4个苗龄段,通过研究不同穴盘规格和苗龄对菜豆性状及产量的影响,筛选出适合菜豆育苗的穴盘规格和适宜的苗龄。结果表明：穴盘育苗的营养面积增大,菜豆产量随之增加,25 d苗龄条件下,32孔穴盘的前期产量和总产量均显著高于50孔穴盘;随着苗龄的增长,菜豆的前期产量和总产量呈增加趋势,其中25 d苗龄的产量显著高于其他苗龄。综合上述各项指标,菜豆育苗阶段,10 d苗龄可选用32孔、50孔穴盘,15 d以上秧苗选用32孔穴盘为宜。     

不同基因型小麦苗期耐低氮性评价及筛选

氮素作为重要的营养元素,限制着小麦的生长发育和经济产量,筛选和培育耐低氮小麦品种是提高氮素利用率、降低生产成本的有效途径.以118份不同基因型小麦为材料,在低氮(0.1 mmol·L-1)和正常氮(5 mmol· L-1)条件下苗期水培,测定根干重、茎叶干重、根冠比、植株干重、最大根长、初生根数和二级初生根数等相关指标...     

ICP-OES法同时测定果蔬中铅、砷、镉、铬、铜、锡含量

果蔬样品经混酸消化后,控制一定的酸度,定容后应用等离子体发射光谱法(ICP-OES)对果蔬中铅、砷、镉、铬、铜、锡六种有害重金属进行测定,研究了分析测定条件,方法简单快速。测定结果表明,五种元素的加标平均回收率在91.0%~107%之间。其RSD均小于3.5%。按该方法进行处理及测定铅、砷、镉、铬、铜、锡,在选择的测定条件下最低检出限分别为0.0006 mg/kg、0.0003 mg/kg、0.00003 mg/kg、0.00005 mg/kg、0.00003 mg/kg、0.0006 mg/kg。     

Segregation of form, color, movement, and depth: anatomy, physiology, and perception

Anatomical and physiological observations in monkeys indicate that the primate visual system consists of several separate and independent subdivisions that analyze different aspects of the same retinal image: cells in cortical visual areas 1 and 2 and higher visual areas are segregated into three interdigitating subdivisions that differ in their selectivity for color, stereopsis, movement, and orientation. The pathways selective for form and color seem to be derived mainly from the parvocellular geniculate subdivisions, the depth- and movement-selective components from the magnocellular. At lower levels, in the retina and in the geniculate, cells in these two subdivisions differ in their color selectivity, contrast sensitivity, temporal properties, and spatial resolution. These major differences in the properties of cells at lower levels in each of the subdivisions led to the prediction that different visual functions, such as color, depth, movement, and form perception, should exhibit corresponding differences. Human perceptual experiments are remarkably consistent with these predictions. Moreover, perceptual experiments can be designed to ask which subdivisions of the system are responsible for particular visual abilities, such as figure/ground discrimination or perception of depth from perspective or relative movement--functions that might be difficult to deduce from single-cell response properties.     

一串红N、P、K、Ca、Mg、Fe缺素症状研究

以‘展望红’为材料,研究N、P、K、Ca、Mg、Fe缺乏对其生长发育的影响,并总结缺素症状,研究结果表明:N缺乏时植株矮小,叶发黄;P缺乏时叶色暗绿,且影响开花;K缺乏时基部叶枯黄,并易落叶;缺Fe症状较为明显,但能正常开花;Ca、Mg未表现出缺素症状,且各项指标要优于全素处理;N、P显著影响一串红的生长发育,K对开花品质的影响较大。     

Strong, transparent, multifunctional, carbon nanotube sheets

Individual carbon nanotubes are like minute bits of string, and many trillions of these invisible strings must be assembled to make useful macroscopic articles. We demonstrated such assembly at rates above 7 meters per minute by cooperatively rotating carbon nanotubes in vertically oriented nanotube arrays (forests) and made 5-centimeter-wide, meter-long transparent sheets. These self-supporting nanotube sheets are initially formed as a highly anisotropic electronically conducting aerogel that can be densified into strong sheets that are as thin as 50 nanometers. The measured gravimetric strength of orthogonally oriented sheet arrays exceeds that of sheets of high-strength steel. These nanotube sheets have been used in laboratory demonstrations for the microwave bonding of plastics and for making transparent, highly elastomeric electrodes; planar sources of polarized broad-band radiation; conducting appliqués; and flexible organic light-emitting diodes.