共查询到20条相似文献，搜索用时 62 毫秒
1.
2.
3.
4.
笔者针对山西忻州地区寒、旱、薄地带玉米栽培问题进行分析试验,提出了适合该地区自然条件的玉米种植方法. 相似文献
5.
在全面贯彻落实党中央十六届三中全会和自治区党六届五次会议精神中,各级政府积极推行产业结构调整,其目的大幅度增加农民的经济收入,农业这一块怎样调整种植结构,我们科技工作者从不同的角度开展工作,特此,将曾做过的十多年的露地栽培西瓜、香瓜、哈密瓜的试验、示范总结出来,提供给广大农民,试验、示范证明,在西藏大于零度年积温2860℃以上农区露地栽培西瓜、香瓜、哈密瓜是成功的.建议农民根据其所在农村各自的生态气候条件,选择适宜的品种、最佳的时间,参考本文提供的栽培方法、栽培密度试种西瓜、香瓜、哈密瓜,将会获得比种粮食作物增加数倍的经济效益,及时调整家庭种植结构,在稳粮自给的基础上,通过经济作物大幅度增加经济收入,是一项见效快、投入少、利润高的有效途径. 相似文献
6.
本文通过水稻水、旱双重适应性理论，对试验条件、试验结果进行分析，找出增产原因并提出栽培技术。。 相似文献
7.
8.
9.
有机、特别及常规栽培体系对蔬菜品质的影响 总被引：2，自引：1，他引：1
采用田间定位试验法研究有机、特别和常规3种栽培体系对8种常见蔬菜品质的影响。结果表明,有机、特别栽培体系中各蔬菜的硝酸盐含量低于常规栽培体系;有机蔬菜的蛋白质含量最低;栽培体系对蔬菜维生素C和可溶性糖含量无显著影响。综合各指标可见,西兰花以有机栽培为最好,而芹菜、菜豆分别以特别栽培和常规栽培品质最佳,其它蔬菜则无明确的趋势。 相似文献
10.
<正> 谷子是旱地主栽作物之一。针对晋东南谷子生产面积下降、单产提高缓慢等问题,我们以屯留县为试点,在调查研究的基础上,边试验、边示范,逐步形成了“晚、增、稳”的规范化栽培技术体系,其要点是适时晚播,以晚防病,以晚防倒,以晚协调谷子对水、温、光的要求,增加灌浆强度,提高经济系数;增加基本苗数保足穗,防病防虫提高成穗率;增加肥料用量施足底肥防后衰;中后期有稳健的群体,有稳健的穗型,建立高积累高转化的源、库、流生产运转和 相似文献
11.
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。 相似文献
12.
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。 相似文献
13.
14.
15.
ICP-OES法同时测定果蔬中铅、砷、镉、铬、铜、锡含量 总被引：2，自引：0，他引：2
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。 相似文献
16.
Segregation of form, color, movement, and depth: anatomy, physiology, and perception 总被引：63，自引：0，他引：63
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. 相似文献
17.
18.
19.
20.
Fiber, food, fuel, and fungal symbionts 总被引：2，自引：0，他引：2
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. 相似文献