共查询到20条相似文献，搜索用时 78 毫秒
1.
运用二次回归旋转组合设计，对优质两系稻两优2186头季稻进行移栽叶龄、插植密度、施N、P、K肥量5项农艺措施研究，建立头季稻、再生稻产量与5项农艺措施的回归模型，分析了农艺措施对两季产量的影响。结果表明，影响头季稻产量的主要因素是叶龄、施N量、施P量和施K量；影响再生稻产量的主要是叶龄、密度和施N量，同时因素间的互作对再生稻产量也有影响。 相似文献
2.
运用二次回归旋转组合设计,对优质两系稻两优2186头季稻进行移栽叶龄、插植密度、施N、P、K肥量5项农艺措施研究,建立头季稻、再生稻产量与5项农艺措施的回归模型,分析了农艺措施对两季产量的影响.结果表明,影响头季稻产量的主要因素是叶龄、施N量、施P量和施K量;影响再生稻产量的主要是叶龄、密度和施N量,同时因素间的互作对再生稻产量也有影响. 相似文献
3.
引种和栽培试验表明,华杂2号油菜适合安徽省种植,尤其适合一年二熟地区种植．单产3000kg／hm2的最适农艺措施为：9月中旬播种育苗,MET化控,10月下旬移栽,密度15万株／hm2,施N180kg／hm2,P2O590kg／hm2,K2O105kg／hm2．硼砂15kg／hm２,磷、钾、硼肥一次性基施,N肥按底肥：苗肥：苔肥＝5：3：2施用．注意防菌核病,集中连片种植确保优质． 相似文献
4.
大葱高产栽培氮磷钾优化配施技术研究 总被引：1，自引：0，他引：1
采用二次回归通用旋转组合设计方法,对河西走廊川水区大葱高产栽培氮磷钾优化配施技术进行了研究。结果表明,试验条件下大葱产量与氮磷钾配施的关系遵从试验建立的一元二次回归模型的变化规律。三因子对产量的影响顺序是:施氮量>施钾量>施磷量。高产优化组合是:纯N187.5～252.0kg/hm~2,P_2O_5 112.5～144.0kg/hm~2,K_2O 262.5～357.0kg/hm~2,N、P、K三项比为1:0.6:1.4,为科学施肥提供了依据。 相似文献
5.
柴家荣 《昆明师范高等专科学校学报》2007,29(4):42-46
探讨了氮磷钾营养与白肋烟农艺性状及氮组分含量的关系，结果表明，农艺性状及氮组分含量与施N量、N：P2O5及N：K2O比例关系密切，单产、比叶重、烟碱与施N量呈极显著正相关，单株叶面积、田间叶面积系数、上中等烟比例、硝酸还原酶（NR）活性与施N量呈显著正相关．三要素对茎围、单株叶面积、田间叶面积系数、单产、上中等烟比例、总氮、烟碱、硝酸还原酶（NR）活性的影响N〉K〉P，比叶重、蛋白质、可溶性蛋白质、总游离氨基酸的影响则为N〉P〉K．农艺性状与氮组分含量的关系也较密切，总氮与单株叶面积、叶面积系数、顶叶面积，烟碱与株高极显著正相关，总氮、烟碱、硝酸还原酶（NR）活性与茎围，蛋白质与单株叶面积、叶面积系数显著正相关，而氮／碱与株高、茎围极显著负相关．综合试验结果，以施N270～300kg／hm^2，N：P2O5：K2O为1：0．5～1：2较适宜． 相似文献
6.
新稻11号高产栽培应走小穴密植，中、低氮肥，分期施氮的技术路线。每hm^2栽插密度不少于28．13万穴(每穴插3～4苗)，施氮量控制在255～352．5kg／hm^2，采用底、面肥40％、分蘖肥50％、保花肥10％的比例分期施用，每hm^2的稻谷产量可达9729．5～9864．8kg／hm^2，增产效应显著。 相似文献
7.
本文采用二次通用旋转回归设计的方法研究了密度、N和K对玉米产量和品质的影响,并对三个栽培因子进行了组合优化研究.结果表明：玉米产量与3因子成二次回归关系,产量高于10772.83kg/hm2的优化区间为：密度74655～82155株/hm2;施氮量257.9～305.9kg/hm2;施钾量261.3～315.9kg/hm2;蛋白质含量与氮肥的施用量正相关,与钾肥的施用量负相关;淀粉含量与氮肥的施用量负相关,与钾肥的施用量正相关;脂肪含量钾肥的施用量正相关;蛋白质、淀粉、脂肪含量均与密度相关不显著. 相似文献
8.
9.
采用五因素二次旋转组合设计田间试验测得的数据．建立了以产量及产量因素为目标函数的试验因子效应系列回归模型。根据产量目标方程，采用模拟仿真，因素取值的频率分析．得出产量650kg／666．7m^2的农艺措施组合决策为秧田播量27．77～29．50kg／666．7m^2、秧龄40．96～42．74d、插秧密度1．55～1．87万穴／666．7m^2、施纯氮16．47～17．43kg／666．7m^2、9．1～9．3叶龄时喷施多效唑，并求得其高产最佳产量结构及对单因素、两因素互作效应作了剖析。 相似文献
10.
通过对杂交玉米品种、667m^2密度，氮肥，磷肥、钾肥的正交试验，得出最优的配置是：绵单1号品种，667m^2密度为2800－330株，施N量10－15kg,P2O5量8－11kg,K2O量5.0-7.5kg. 相似文献
11.
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
12.
13.
14.
《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
15.
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
16.
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
17.
《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
18.
Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
19.
20.
GUO Bao-feng Xiao Da-wei 《重庆大学学报(英文版)》2005,4(3):129-133
Using virtual reality for interactive design gives a designer an intuitive vision of a design and allows the designer to achieve a viable, optimal solution in a timely manner. The article discusses the process of making the Virtual Reality System of the Humble Administrator＇s Garden. Translating building data to the Virtual Reality Modeling Language （VRML） is by far unsatisfactory. This creates a challenge for computer designers to do optimization to meet requirements. Five different approaches to optimize models have been presented in this paper. The other methods are to optimize VRML and to reduce the file size. This is done by keeping polygon counts to a minimum and by applying such techniques as object culling and level-ofdetail switching. 相似文献