秋季糯玉米—冬油菜轮作高产栽培技术

根据生产实际,探索出秋季糯玉米—冬油菜轮作栽培模式,在发展乡村游的同时,促进农业生产;并总结了秋季糯玉米—冬油菜轮作高产栽培技术。     

竹荪—蒜—烟—稻轮作模式及栽培技术

竹荪—蒜—烟—稻轮作模式在水北镇推广应用,表现较优,总结了该模式的栽培技术。     

花椰菜—夏毛豆—秋冬菠菜一年三熟有机栽培技术

根据作物轮作的栽培优势,介绍了花椰茶—夏毛豆—秋冬菠菜一年三熟有机栽培模式,以期经济利用土地,获得最大收益。     

稻田花椰菜—毛豆—单季稻三熟轮作无公害栽培技术

总结稻田花椰菜—毛豆—单季稻三熟轮作无公害栽培技术,包括选地施肥、选种、合理密植、播种、田间管理、病虫害防治、采收等方面内容,以期为当地花椰菜—毛豆—单季稻无公害栽培提供参考。     

大棚春糯玉米-秋茄子轮作高效栽培技术

该文总结了重庆市江津区大棚春糯玉米—秋茄子轮作高效栽培技术，并对该技术在生产中取得的效益进行了分析，以期为在当地推广春糯玉米—秋茄子轮作栽培模式提供依据。     

建宁县水田轮作模式及主要栽培技术

总结建宁县水田高效优质、粮经结合的多种轮作模式,包括春、秋2季连制、糯玉米—水稻轮作模式、烤烟—紫薯轮作模式,并分别介绍其主要栽培技术,以指导水田的种植。     

香蒜—糯玉米—毛豆轮作栽培技术

<正>福建省建瓯市徐墩镇种植香蒜历史悠久,形成了以富头村为中心的富头香蒜品牌。富头香蒜为紫皮大蒜,辛辣味浓烈。近几年市场对紫皮香蒜的需求量逐渐增多,徐墩镇紫皮香蒜种植面积也逐年扩大。为进一步挖掘单位面积土地生产潜力,降低种植单一品种带来的市场风险,徐墩镇蒜农不断探索高产高效种植模式,在发挥本地传统冬种香蒜优     

毛豆——水稻轮作高产栽培技术

明溪县推广毛豆一水稻轮作栽培模式,经济效益明显。分析了该模式的优点,并总结了毛豆一水稻轮作模式的栽培技术。     

蒜作玉米种植模式及高产栽培技术

分析了赵墩镇蒜套玉米与大蒜—玉米轮作两种蒜作玉米种植模式的生产特点及经济效益,并总结了两种种植模式下玉米的配套栽培措施。     

榨菜—黄瓜—毛豆高效种植模式探讨

介绍了冬春种植榨菜—春套种黄瓜—秋套种毛豆的高效种植模式效果,并分别介绍了该模式下榨菜、黄瓜、毛豆的栽培技术,为采用该模式的种植户提供技术参考。     

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,采用模糊隶属函数法、主成分分析以及聚类分析法综合评价小麦品种的耐低氮性。结果表明,在低氮胁迫下小麦幼苗的根干重、根冠比和初生根数目显著提高,茎叶干重、植株干重和最大根长不同程度的降低,7个苗期性状指标在两个氮水平下均存在显著性差异。主成分分析提取3个主成分,贡献率分别为 43.575%、22.904%和17.873%,累积贡献率达 84.351%。以耐低氮性综合评价D值进行聚类分析,将118份小麦品种划分为强耐低氮型、耐低氮型、中间型、较敏感型和敏感型5类。筛选出3份耐低氮型小麦（齐大195、金丰7183和天民198）和2份强耐低氮型小麦（山农0917和鲁麦8号）。不同小麦品种的耐低氮机制不同,研究结果为小麦耐低氮品种的选育提供理论依据和材料基础。     

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.     

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。     

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。     

Fiber, food, fuel, and fungal symbionts

Virtually all plants of economic importance form mycorrhizae. These absorbing organs of higher plants result from a symbiotic union of beneficial soil fungi and feeder roots. In forestry, the manipulation of fungal symbionts ecologically adapted to the planting site can increase survival and growth of forest trees, particularly on adverse sites. Vesicular-arbuscular mycorrhizae, which occur not only on many trees but also on most cultivated crops, are undoubtedly more important to world food crops. Imperatives for mycorrhizal research in forestry and agriculture are (i) the development of mass inoculum of mycorrhizal fungi, (ii) the interdisciplinary coordination with soil management, plant breeding, cultivation practices, and pest control to ensure maximum survival and development of fungal symbionts in the soil, and (iii) the institution of nursery and field tests to determine the circumstances in which mycorrhizae benefit plant growth in forestry and agri-ecosystems.