共查询到20条相似文献，搜索用时 78 毫秒
1.
研究证明麦套花生在喷施100μg/gP333(多效唑)的化控条件下,适宜的栽培密度是12000穴/667m2～13000穴/667m2.产量可达350～375kg/667m2.在花生花期后喷施多效唑能显著地提高产量. 相似文献
2.
采用二次通用旋转组合设计方法, 研究凤糯2146产量与密度、基肥(三元复合肥)、追肥(尿素)三项栽培措施的关系, 建立了产量与三项栽培措施之间的回归数学模型.通过模拟综合寻优,提出了凤糯2146获得鲜重1164 kg /667m2以上的栽培措施决策方案为:密度4300～4500株/667m2,基肥50～53kg /667m2,追肥51.2～54.3kg /667m2. 相似文献
3.
节水灌溉模式下,不施氮肥能够明显提前成熟,不同氮肥用量对新麦19的生育进程没有明显影响.成穗数在氮肥用量大(12～20 kg/667m2以上)时较高,在氮肥用量少(8 kg/667m2以下)时较低;穗粒数在氮肥用量8～16kg/667m2时较高,不施氮肥的处理穗粒数最少;千粒重随着氮肥用量的增加呈下降趋势.施用氮肥能够明显降低新麦19的黑胚率和秕籽率.全程施氮量为16 kg/667m2(即底肥9.6 kg/667m2、拔节期追肥6.4 kg/667m2)时,产量最高、最经济. 相似文献
4.
在潮土区施科配牌配方肥与传统施肥作对照,二者相对667m2增效益65.88～74.12元.净增效益39.88～48.12元/667m2. 相似文献
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作者以黄淮海平原典型的小麦玉米两熟农作制为案例,进行了水氮耦合试验.结果表明,在同一施氮水平上,麦玉产量随着灌水量增加而增加,灌2水比灌1水,产量增加幅度是2.60%～14.45%,浇水3次的麦玉产量与灌水2次的基本持平或略有下降.因此,以小麦灌2水处理最好;在同一水处理上,麦玉产量随着施氮量的增加而增加,当施氮量增加到22.5kg/667m2时产量达到最高,施氮水平增加到30.kg/667m2时,有所下降.因此,以单位耕地施氮22.5kg/667m2最佳.水分利用效率与麦玉产量具有相同的变化趋势.所以,以小麦灌2水,单位耕地施氮22.5kg/667m2时作物产量和水分利用效率最好,此时对小麦而言可节水50m3/667m2左右. 相似文献
6.
乌兰察布地区胡萝卜优化施肥方案初步研究 总被引：1，自引：0，他引：1
本试验通过正交旋转回归设计在乌兰察布地区选取氮、磷、钾和有机肥为参试变量,以胡萝卜产量为目标函数,建立了胡萝卜产量与参试因子间的数学模型,得出了各变量与产量的主次关系及各因素对产量的效应。最后,通过模拟寻优获得了本试验地条件下胡萝卜产量高于6000kg/667m2的施肥方案：N（8.06-8.72kg/667m2）、P2O5（3.89-4.26kg/667m2）、K2O（19.10-20.45kg/667m2）、有机肥（6346-6907kg/667m2）。 相似文献
7.
采用二次回归正交旋转组合设计,对糯玉米皖单5号高产栽培的三项主要农艺措施进行田间试验.对数据利用电子计算机进行处理,得出数学栽培模式,并建立了模拟优化密度、氮肥和磷肥实施方案数学模型.结果表明:皖单5号种植密度为4408株/667m2;尿素为33.83kg/667m2;磷酸二铵为14.62kg/667m2,可获得258.37kg/667m2的产量. 相似文献
8.
目的旨在筛选出适合本地区条件的高产、优质玉米杂交种,测试和了解引进玉米杂交种的特征、特性和表现,为下一步品种比较试验提供依据.结果表明:安2032、安2071、丰盛1号的单产均超过对照黔西4号665 4kg/667m2的产量,5个杂交种的单产超过对照毕玉4号533 6kg/667m2的产量,每667m2增产104 4～168 2kg,增长幅度19 6%～31 5%,增产效果明显.另外,各参试品种经济性状各具特色,在生育过程中均未发生玉米病害感染和虫害危害,对病虫害有一定抗性.结果表明各参试玉米杂交种均可作为下一年度玉米品种比较试验的材料. 相似文献
9.
夏播糯玉米凤糯476栽培技术模式研究 总被引：1，自引：0，他引：1
采用二次通用旋转组合设计,研究了不同密度、基肥、追肥水平对夏播玉米品种凤糯476的产量的影响.结果表明,密度对产量的影响最大,其次是追肥,最小是基肥.这三个因子中,仅有密度和基肥的交互作用显著,为正交互作用.在本试验条件下,最佳组合就是三个因子的最高值,即以4800株/667m2的密度,基肥和追肥的配施量为48.5kg/667m2,获得的模拟产量为1296.34kg/667m2. 相似文献
10.
在不施肥夏大豆产量170kg/667m2左右的生产条件下,夏大豆施用惠满丰有机复混肥20-60kg/667m2,增产大豆45-7-102.3kg,平均77.5kg,其增产幅度为27.0％-60.4％,平均45.8％;在等养分量情况下,惠满丰有机复混肥较化肥增产17.9％;惠满丰有机复混肥的适宜用量为40kg/667m2.惠满丰有机复混肥对夏大豆的增产原因主要有:促进生长,有利于干物质积累,改善结实性状,协调产量构成因素等. 相似文献
11.
罗艳萍 《读与写:教育教学刊》2008,5(6)
The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity. 相似文献
12.
邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
13.
Richard Denner 《海外英语》2007,(4):14-15
Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose. 相似文献
14.
Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F. 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
18.
陈美曦 《山东教育学院学报》2008,23(2):103-107
Different nations have different social cultures, and the social culture of every nation is developing with the development of the nation, language is greatly influenced by social culture, which enables language to possess national and historical characteristics. Word is the smallest, independent, meaningful linguistic unit of language. It can well reflect the national and historical characteristics. From synchronic aspect, the social and cultural influence on word meaning is mainly embodied in conceptual and associative meanings of word. The incorrespondence of word meaning is a phenomenon that exists in both conceptual and associative meanings of word among different languages. From diachronic aspect, the development of social culture causes some changes of word meaning to some extent. Therefore, social culture plays a key role in vocabulary learning and mastery of a language. 相似文献
19.
Rachel Zupek 《海外英语》2007,(11):40-41
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了 相似文献
20.
YANGShiguo 《重庆大学学报(英文版)》2004,3(1):86-88
The problem on the geometrc inequalities involving an n-dimensional simplex and its inscribed simplex is studied. Aninequality is established, which reveals that the difference between the squared circumradius of the n-dimensional simplex andthe squared distance between its circumcenter and barycenter times the squared circumradius of its inscribed simplex is not lessthan the 2(n-1)th power of n times its squared inradius, and is equal to when the simplex is regular and its inscribed siplex is atangent point one. Deduction from this inequality reaches a generalization of n-dimensional Euler inequality indicating that thecircumradius of the simplex is not less than the n-fold inradius. Another inequality is derived to present the relationship betweenthe circumradius of the n-dimensional simplex and the circumradius and inradius of its pedal simplex. 相似文献